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Laouarem A, Kara-Mohamed C, Bourennane EB, Hamdi-Cherif A. HTC-retina: A hybrid retinal diseases classification model using transformer-Convolutional Neural Network from optical coherence tomography images. Comput Biol Med 2024; 178:108726. [PMID: 38878400 DOI: 10.1016/j.compbiomed.2024.108726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 06/04/2024] [Accepted: 06/07/2024] [Indexed: 07/24/2024]
Abstract
Retinal diseases are among nowadays major public health issues, deservedly needing advanced computer-aided diagnosis. We propose a hybrid model for multi label classification, whereby seven retinal diseases are automatically classified from Optical Coherence Tomography (OCT) images. We show that, by combining the strengths of Convolutional Neural Networks (CNNs) and Visual Transformers (ViTs), we can produce a more powerful type of model for medical image classification, especially when considering local lesion information such as retinal diseases. CNNs are indeed proved to be efficient at parameter utilization and provide the ability to extract local features and multi-scale feature maps through convolutional operations. On the other hand, ViT's self-attention procedure allows processing long-range and global dependencies within an image. The paper clearly shows that the hybridization of these complementary capabilities (CNNs-ViTs) presents a high image processing potential that is more robust and efficient. The proposed model adopts a hierarchical CNN module called Convolutional Patch and Token Embedding (CPTE) instead of employing a direct tokenization approach using the raw input OCT image in the transformer. The CPTE module's role is to incorporate an inductive bias, to reduce the reliance on large-scale datasets, and to address the low-level feature extraction challenges of the ViT. In addition, considering the importance of local lesion information in OCT images, the model relies on a parallel module called Residual Depthwise-Pointwise ConvNet (RDP-ConvNet) for extracting high-level features. RDP-ConvNet utilizes depthwise and pointwise convolution layers within a residual network architecture. The overall performance of the HTC-Retina model was evaluated on three datasets: the OCT-2017, OCT-C8, and OCT-2014 ; outperforming previous established models, achieving accuracy rates of 99.40%, 97.00%, and 99.77%, respectively ; and sensitivity rates of 99.41%, 97.00%, and 99.77%, respectively. Notably, the model showed high performance while maintaining computational efficiency.
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Affiliation(s)
- Ayoub Laouarem
- Department of Computer Science, University of Ferhat Abbas 1, Setif, Algeria.
| | - Chafia Kara-Mohamed
- Department of Computer Science, University of Ferhat Abbas 1, Setif, Algeria
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Guan WX, Zhao XF, Yu WH, Peng XY. OPTICAL COHERENCE TOMOGRAPHY FINDINGS IN PRESUMED VETERINARY ANTHELMINTIC DRUG-INDUCED RETINAL TOXICITY: A Glimpse into Underlying Mechanism. Retina 2024; 44:1456-1462. [PMID: 39047132 DOI: 10.1097/iae.0000000000004128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
PURPOSE To report optical coherence tomography findings of presumed veterinary anthelmintic drugs (VADs)-induced retinal toxicity that may aid in understanding potential pathogenic mechanisms. METHODS This is a retrospective observational case series analysis of patients with vision abnormalities following the accidental or intentional consumption of veterinary anthelmintic drugs. All cases underwent a thorough ophthalmological examination. Moreover, medical records, as well as the initial and follow-up optical coherence tomography images, were thoroughly scrutinized. RESULTS Four patients were identified (3 men; mean [range] age, 36.5 [22-52] years). Each patient overdosed on one or two of the following VADs: closantel, triclabendazole, praziquantel, pyrantel pamoate, and niclofolan. The most characteristic optical coherence tomography finding was diffuse, granular, hyperreflective lesions throughout the outer retina, which were initially identified in the ellipsoid zone in two cases. At follow-up, optical coherence tomography exhibited regression of hyperreflective lesions and extensive loss of the outer retinal elements in two patients. In addition, the subfoveal outer retinal layers may be partially preserved. CONCLUSION Some veterinary anthelmintic drugs could be detrimental to the human retina if overdosed, resulting in visual disturbances. Optical coherence tomography revealed the mitochondria-enriched ellipsoid zone where outer retinal damage first appeared on, implying that these medications may harm the retina by inhibiting mitochondrial energy metabolism, as they do to eliminate parasites.
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Affiliation(s)
- Wen-Xue Guan
- Department of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China; and
| | - Xu-Feng Zhao
- Department of Ophthalmology, Peking Union Medical College Hospital, Key Laboratory of Ocular Fundus Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Wei-Hong Yu
- Department of Ophthalmology, Peking Union Medical College Hospital, Key Laboratory of Ocular Fundus Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Xiao-Yan Peng
- Department of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China; and
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Ding N, Jiang H, Xiang B, Yu Y, Ji C, Liu J, Zhao Y, Luan J, Yang Y, Wang Y, Ma Z. Probe fusion all-optic OCT-PAM dual-mode imaging system for biomedical imaging. PHOTOACOUSTICS 2024; 38:100631. [PMID: 39055738 PMCID: PMC11269793 DOI: 10.1016/j.pacs.2024.100631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 05/29/2024] [Accepted: 06/28/2024] [Indexed: 07/27/2024]
Abstract
We proposed a non-contact photoacoustic (PA) detection method using spectral domain optical coherence tomography (SDOCT). Two interference spectrums (A-lines) were acquired before and after the PA excitation with SDOCT. PA signal propagated within the sample causing the vibration. The vibration inner the sample introduced phase change between the acquired two A-lines. Thus, the PA signal can be detected by evaluating the difference in phase between the two A-lines. Based on the method, an OCT-PAM dual-mode imaging system was constructed. In the system, SDOCT served as the detection unit for PAM. Thus, the combination of the two imaging modalities was simplified. Another advantage of the system is that it realizes non-contact all-optic detection, which is attractive for biomedical imaging. Using the system, we imaged phantoms of carbon fibers, asparagus leaves and human hairs. Furthermore, the cortical vasculature of rat was imaged in vivo and the flow status was evaluated quantitatively.
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Affiliation(s)
- Ning Ding
- College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Huiwen Jiang
- College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Ben Xiang
- College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Yao Yu
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
| | - Cheng Ji
- Qinhuangdao Haigang Hospital, Qinhuangdao 066004, China
| | - Jian Liu
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
| | - Yuqian Zhao
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
| | - Jingmin Luan
- School of Computer and Communication Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
| | - Yanqiu Yang
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
| | - Yi Wang
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
| | - Zhenhe Ma
- School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, china
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004, China
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Li M, Wang Y, Gao H, Xia Z, Zeng C, Huang K, Zhu Z, Lu J, Chen Q, Ke X, Zhang W. Exploring autism via the retina: Comparative insights in children with autism spectrum disorder and typical development. Autism Res 2024. [PMID: 39075780 DOI: 10.1002/aur.3204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 07/11/2024] [Indexed: 07/31/2024]
Abstract
Autism spectrum disorder (ASD) is a widely recognized neurodevelopmental disorder, yet the identification of reliable imaging biomarkers for its early diagnosis remains a challenge. Considering the specific manifestations of ASD in the eyes and the interconnectivity between the brain and the eyes, this study investigates ASD through the lens of retinal analysis. We specifically examined differences in the macular region of the retina using optical coherence tomography (OCT)/optical coherence tomography angiography (OCTA) images between children diagnosed with ASD and those with typical development (TD). Our findings present potential novel characteristics of ASD: the thickness of the ellipsoid zone (EZ) with cone photoreceptors was significantly increased in ASD; the large-caliber arteriovenous of the inner retina was significantly reduced in ASD; these changes in the EZ and arteriovenous were more significant in the left eye than in the right eye. These observations of photoreceptor alterations, vascular function changes, and lateralization phenomena in ASD warrant further investigation, and we hope that this work can advance interdisciplinary understanding of ASD.
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Affiliation(s)
- Mingchao Li
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
- Future Lab, Tsinghua University, Beijing, China
| | - Yuexuan Wang
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Huiyun Gao
- Child Mental Health Research Center, Brain Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Zhengwang Xia
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Chaofan Zeng
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Kun Huang
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Zhaoqi Zhu
- Department of Ophthalmology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jianfeng Lu
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Qiang Chen
- School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Xiaoyan Ke
- Child Mental Health Research Center, Brain Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Weiwei Zhang
- Department of Ophthalmology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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El Ayoubi NK, Ismail A, Fahd F, Younes L, Chakra NA, Khoury SJ. Retinal optical coherence tomography measures in multiple sclerosis: a systematic review and meta-analysis. Ann Clin Transl Neurol 2024. [PMID: 39073308 DOI: 10.1002/acn3.52165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 07/12/2024] [Accepted: 07/12/2024] [Indexed: 07/30/2024] Open
Abstract
Spectral domain-optical coherence tomography plays a crucial role in the early detection and monitoring of multiple sclerosis (MS) pathophysiology. We aimed to quantify differences in retinal layer measures among different groups of MS and explored different variables that correlate with retinal measures. This study was reported according PRISMA guidelines. A comprehensive search was done across PubMed, Embase, and Google Scholar. The mean difference in thickness of retinal layers and macular volume was assessed. Meta-regression was done to assess the sources of heterogeneity. A total of 100 articles were included in the meta-analyses. The peripapillary retinal nerve fiber layer (pRNFL) thickness significantly decreased in the MSON (MD: -16.44, P < 0.001), MSNON (MD: -6.97, P < 0.001), and PMS (MD: -11.35, P < 0.001) versus HC. The macular RNFL was lower among the MSON (MD: -6.24, P = 0.013) and MSNON (MD: -3.84, P <0.001) versus HC. Macular ganglion cell layer and inner plexiform layer (GCIPL) was thinner among MSON (MD: -14.83, P <0.001), MSNON (MD: -6.38, P < 0.001), and PMS (MD: -11.52, P < 0.001) compared with control eyes. Inner nuclear layer (INL) was higher in the MSON (MD: 0.49, P < 0.001) versus HC. Outer nuclear layer (ONL) thickness significantly lower in the MSNON (MD: -1.15, P = 0.019) versus HC. Meta-regression showed that disease duration, age, EDSS score, and percentage of patients taking DMT are all negatively correlated with pRNFL and GCIPL thickness; however, female gender was correlated with less atrophy. As conclusion, the study highlights substantial thinning in the pRNFL and macular GCIPL between MS versus controls. INL as valuable parameter for capturing inflammatory disease activity.
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Affiliation(s)
- Nabil K El Ayoubi
- Nehme and Therese Tohme Multiple Sclerosis Center, Department of Neurology, American University of Beirut, Beirut, Lebanon
| | - Ali Ismail
- Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
- Faculty of Medical Sciences, Neuroscience Research Center, Lebanese University, Beirut, Lebanon
| | - Fares Fahd
- Nehme and Therese Tohme Multiple Sclerosis Center, Department of Neurology, American University of Beirut, Beirut, Lebanon
| | - Lama Younes
- Nehme and Therese Tohme Multiple Sclerosis Center, Department of Neurology, American University of Beirut, Beirut, Lebanon
| | - Nour A Chakra
- Nehme and Therese Tohme Multiple Sclerosis Center, Department of Neurology, American University of Beirut, Beirut, Lebanon
| | - Samia J Khoury
- Nehme and Therese Tohme Multiple Sclerosis Center, Department of Neurology, American University of Beirut, Beirut, Lebanon
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Rathbone E, Fu D. Quantitative Optical Imaging of Oxygen in Brain Vasculature. J Phys Chem B 2024; 128:6975-6989. [PMID: 38991095 DOI: 10.1021/acs.jpcb.4c01277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
The intimate relationship between neuronal activity and cerebral oxygenation underpins fundamental brain functions like cognition, sensation, and motor control. Optical imaging offers a noninvasive approach to assess brain oxygenation and often serves as an indirect proxy for neuronal activity. However, deciphering neurovascular coupling─the intricate interplay between neuronal activity, blood flow, and oxygen delivery─necessitates independent, high spatial resolution, and high temporal resolution measurements of both microvasculature oxygenation and neuronal activation. This Perspective examines the established optical techniques employed for brain oxygen imaging, specifically functional near-infrared spectroscopy, photoacoustic imaging, optical coherence tomography, and two-photon phosphorescent lifetime microscopy, highlighting their fundamental principles, strengths, and limitations. Several other emerging optical techniques are also introduced. Finally, we discuss key technological challenges and future directions for quantitative optical oxygen imaging, paving the way for a deeper understanding of oxygen metabolism in the brain.
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Affiliation(s)
- Emily Rathbone
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Dan Fu
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
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Cummings OW, Rahman S, Fletcher L, Scott AW. Advances in sickle cell retinopathy screening techniques, tests, and practices: A systematic review. Am J Hematol 2024. [PMID: 39041108 DOI: 10.1002/ajh.27439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 07/01/2024] [Accepted: 07/09/2024] [Indexed: 07/24/2024]
Abstract
Sickle cell retinopathy (SCR) is a progressive, sight-threatening ophthalmic complication of sickle cell disease (SCD). Current SCR screening focuses on the detection of pathologic sea fan neovascularization, the first sign of proliferative sickle cell retinopathy (PSR). If untreated, PSR can lead to severe visual impairment and blindness through progression to vitreous hemorrhage and/or retinal detachment. SCR screening with dilated fundus examination (DFE) is recommended every 1-2 years starting at age 10, but data underlying this recommendation are of poor quality and based upon expert consensus. We performed a systematic review to characterize imaging techniques, laboratory-based tests, and clinical practices for SCR screening. This PROSPERO-registered systematic review included relevant texts identified through predetermined searches in online databases. Collected test accuracy data facilitated the calculation of likelihood ratios. Forty-four studies evaluating 4928 patients were included. DFE demonstrated moderate test accuracy (LR+ of 8.0, LR- of 0.3). Ultra-widefield-fundus photography demonstrated superior accuracy (LR+ 32.5, LR- 0.03). Optical coherence tomography angiography applications were highly accurate for PSR identification (machine learning LR+ 32.5, LR- 0.03; human grader LR+ 2.8-213.1, LR- 0.1-0.2). Most techniques and tests were more accurate at detecting PSR than staging SCR or detecting lower-grade SCR. Our findings support the integration of advanced image-based approaches, such as computer-based image analysis and ultra-wide-field fundus imaging, for SCR screening in SCD patients given the superior accuracy in PSR detection compared with the current standard of care. Rigorous SCR screening implementation studies are needed to support evidence-based SCR screening recommendations.
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Affiliation(s)
- Olivia W Cummings
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Sara Rahman
- Johns Hopkins University, Baltimore, Maryland, USA
| | - Lauren Fletcher
- Health and Biomedical Library Services, Brown University Library, Providence, Rhode Island, USA
| | - Adrienne W Scott
- Retina Division, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Gruberg L. Reluctance: The Ongoing Reality of Intravascular Imaging. J Am Coll Cardiol 2024; 84:379-381. [PMID: 39019532 DOI: 10.1016/j.jacc.2024.05.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 05/20/2024] [Indexed: 07/19/2024]
Affiliation(s)
- Luis Gruberg
- Northwell, New Hyde Park and Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York, USA; Mather Hospital, Port Jefferson, New York, USA.
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9
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Muñoz-Gallego A, Torres-Peña JL, Rodríguez-Salgado M, Ortueta-Olartecoechea A, López-López C, De La Cruz J, Tejada-Palacios P. Values of peripapillary retinal nerve fibre layer thickness are different in children and adults. Clin Exp Optom 2024:1-9. [PMID: 39025791 DOI: 10.1080/08164622.2024.2376199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 07/01/2024] [Indexed: 07/20/2024] Open
Abstract
CLINICAL RELEVANCE The detection of abnormal values of peripapillary nerve fibre layer (pRNFL) thickness measured with optical coherence tomography (OCT) is important for detecting optic nerve disease in children. BACKGROUND To evaluate the level of agreement between the adult reference database supplied with an OCT device and the present paediatric study database for the measurement of pRNFL thickness in children. This study also aimed to provide reference values for pRNFL thickness according to the spherical equivalent in the paediatric population. METHODS This was a cross-sectional study. One hundred and twenty-six healthy children were included, who had undergone a full ophthalmological examination including cycloplegic refraction and examination of pRNFL thickness using the Topcon 3D OCT 2000 device (Topcon Corporation, Tokyo, Japan). Values equal to or below the fifth percentile (≤p5) and above the 95th percentile (>p95) were considered abnormal. Observed agreement and specific agreement were investigated between OCT measurements classified with paediatric and adult reference values for normality. RESULTS Values ≤ p5 in the adult database were recorded for 2 of the 30 values (6.6%) of the pRNFL values by quadrants ≤p5 in the paediatric database and 17 of the 88 (19.3%) values by sectors ≤p5. For values >p95 in the adult database, 88% by quadrants and 72% by sectors would have been classified as being within the normal range using the paediatric database. CONCLUSION The use of adult reference values currently available in OCT devices can lead to classification errors concerning the normal range of pRNFL thickness in a large proportion of paediatric patients. The use of normative paediatric databases, such as the one discussed in this study, should be taken into consideration.
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Affiliation(s)
| | | | | | | | | | - Javier De La Cruz
- Research Institute (imas12), Madrid University Hospital, Madrid, Spain
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De Bruyn H, Johnson M, Moretti M, Ahmed S, Mujat M, Akula JD, Glavan T, Mihalek I, Aslaksen S, Molday LL, Molday RS, Berkowitz BA, Fulton AB. The Surviving, Not Thriving, Photoreceptors in Patients with ABCA4 Stargardt Disease. Diagnostics (Basel) 2024; 14:1545. [PMID: 39061682 PMCID: PMC11275370 DOI: 10.3390/diagnostics14141545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 06/25/2024] [Accepted: 07/02/2024] [Indexed: 07/28/2024] Open
Abstract
Stargardt disease (STGD1), associated with biallelic variants in the ABCA4 gene, is the most common heritable macular dystrophy and is currently untreatable. To identify potential treatment targets, we characterized surviving STGD1 photoreceptors. We used clinical data to identify macular regions with surviving STGD1 photoreceptors. We compared the hyperreflective bands in the optical coherence tomographic (OCT) images that correspond to structures in the STGD1 photoreceptor inner segments to those in controls. We used adaptive optics scanning light ophthalmoscopy (AO-SLO) to study the distribution of cones and AO-OCT to evaluate the interface of photoreceptors and retinal pigment epithelium (RPE). We found that the profile of the hyperreflective bands differed dramatically between patients with STGD1 and controls. AO-SLOs showed patches in which cone densities were similar to those in healthy retinas and others in which the cone population was sparse. In regions replete with cones, there was no debris at the photoreceptor-RPE interface. In regions with sparse cones, there was abundant debris. Our results raise the possibility that pharmaceutical means may protect surviving photoreceptors and so mitigate vision loss in patients with STGD1.
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Affiliation(s)
- Hanna De Bruyn
- Department of Ophthalmology, Boston Children’s Hospital, Boston, MA 02115, USA; (H.D.B.)
| | - Megan Johnson
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Madelyn Moretti
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Saleh Ahmed
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Mircea Mujat
- Physical Sciences, Inc., 20 New England Business Center, Andover, MA 01810, USA;
| | - James D. Akula
- Department of Ophthalmology, Boston Children’s Hospital, Boston, MA 02115, USA; (H.D.B.)
- Department of Ophthalmology, Harvard Medical School, Boston, MA 02115, USA
| | - Tomislav Glavan
- Department of Molecular Medicine and Biotechnology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia
| | - Ivana Mihalek
- Department of Molecular Medicine and Biotechnology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia
| | - Sigrid Aslaksen
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Clinical Science, University of Bergen, 5007 Bergen, Norway
- Department of Medical Genetics, Haukeland University Hospital, 5009 Bergen, Norway
| | - Laurie L. Molday
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Robert S. Molday
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Bruce A. Berkowitz
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Anne B. Fulton
- Department of Ophthalmology, Boston Children’s Hospital, Boston, MA 02115, USA; (H.D.B.)
- Department of Ophthalmology, Harvard Medical School, Boston, MA 02115, USA
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11
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Ni S, Ng R, Huang D, Chen S, Young BK, Peter Campbell J, Jian Y. Non-mydriatic ultra-widefield diffraction-limited retinal imaging. OPTICS LETTERS 2024; 49:3902-3905. [PMID: 39008737 DOI: 10.1364/ol.525364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Accepted: 06/20/2024] [Indexed: 07/17/2024]
Abstract
We demonstrate a new non-mydriatic ultra-widefield optical coherence tomography retinal imaging system, designed with custom optics to improve the imaging field of view, lateral resolution, and patient comfort. The key motivation is to address the challenge with conventional systems that require pupillary dilation, adding time, expense, discomfort, and medical risk to the examination of the retina. Our system provides an ultrawide 100° field of view (beam scanning angle at the scanning pivot point) and maintains a lateral resolution of 20 µm on the center. It also allows a generous working distance of 16 mm, 2-3 times longer than existing ultra-widefield OCT imaging systems. This advanced system was able to avoid iris vignetting artifacts without pharmacological dilation and ensure diffraction-limited ultra-widefield imaging under a generalized eye model. This enables a comprehensive evaluation of retina diseases, especially those affecting the peripheral regions.
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12
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Ge GR, Song W, Giannetto MJ, Rolland JP, Nedergaard M, Parker KJ. Mouse brain elastography changes with sleep/wake cycles, aging, and Alzheimer's disease. Neuroimage 2024; 295:120662. [PMID: 38823503 DOI: 10.1016/j.neuroimage.2024.120662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 05/05/2024] [Accepted: 05/30/2024] [Indexed: 06/03/2024] Open
Abstract
Understanding the physiological processes in aging and how neurodegenerative disorders affect cognitive function is a high priority for advancing human health. One specific area of recently enabled research is the in vivo biomechanical state of the brain. This study utilized reverberant optical coherence elastography, a high-resolution elasticity imaging method, to investigate stiffness changes during the sleep/wake cycle, aging, and Alzheimer's disease in murine models. Four-dimensional scans of 44 wildtype mice, 13 mice with deletion of aquaporin-4 water channel, and 12 mice with Alzheimer-related pathology (APP/PS1) demonstrated that (1) cortical tissue became softer (on the order of a 10% decrease in shear wave speed) when young wildtype mice transitioned from wake to anesthetized, yet this effect was lost in aging and with mice overexpressing amyloid-β or lacking the water channel AQP4. (2) Cortical stiffness increased with age in all mice lines, but wildtype mice exhibited the most prominent changes as a function of aging. The study provides novel insight into the brain's biomechanics, the constraints of fluid flow, and how the state of brain activity affects basic properties of cortical tissues.
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Affiliation(s)
- Gary R Ge
- The Institute of Optics, University of Rochester, 480 Intercampus Drive, Rochester, NY 14627, USA
| | - Wei Song
- Center for Translational Neuromedicine, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA
| | - Michael J Giannetto
- Center for Translational Neuromedicine, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA
| | - Jannick P Rolland
- The Institute of Optics, University of Rochester, 480 Intercampus Drive, Rochester, NY 14627, USA; Department of Biomedical Engineering, University of Rochester, 204 Robert B. Goergen Hall, Rochester, NY 14627, USA; Center for Visual Science, University of Rochester, 361 Meliora Hall, Rochester, NY 14627, USA
| | - Maiken Nedergaard
- Center for Translational Neuromedicine, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA; Center for Translational Neuromedicine, University of Copenhagen, Blegdamsvej 3B, 2200-N, Denmark.
| | - Kevin J Parker
- Department of Biomedical Engineering, University of Rochester, 204 Robert B. Goergen Hall, Rochester, NY 14627, USA; Department of Electrical and Computer Engineering, University of Rochester, 500 Computer Studies Building, Rochester, NY 14627, USA; Department of Imaging Sciences (Radiology), University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA.
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13
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Liu Z, Aghayee S, Soltanian-Zadeh S, Kovalick K, Agrawal A, Saeedi O, Cukras C, Chew EY, Farsiu S, Hammer DX. Quantification of Human Photoreceptor-Retinal Pigment Epithelium Macular Topography with Adaptive Optics-Optical Coherence Tomography. Diagnostics (Basel) 2024; 14:1518. [PMID: 39061655 PMCID: PMC11276449 DOI: 10.3390/diagnostics14141518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 06/25/2024] [Accepted: 06/27/2024] [Indexed: 07/28/2024] Open
Abstract
Photoreceptors (PRs) and retinal pigment epithelial (RPE) cells form a functional unit called the PR-RPE complex. The PR-RPE complex plays a critical role in maintaining retinal homeostasis and function, and the quantification of its structure and topographical arrangement across the macula are important for understanding the etiology, mechanisms, and progression of many retinal diseases. However, the three-dimensional cellular morphology of the PR-RPE complex in living human eyes has not been completely described due to limitations in imaging techniques. We used the cellular resolution and depth-sectioning capabilities of a custom, high-speed Fourier domain mode-locked laser-based adaptive optics-optical coherence tomography (FDML-AO-OCT) platform to characterize human PR-RPE complex topography across the temporal macula from eleven healthy volunteers. With the aid of a deep learning algorithm, key metrics were extracted from the PR-RPE complex of averaged AO-OCT volumes including PR and RPE cell density, PR outer segment length (OSL), and PR/RPE ratio. We found a tight grouping among our cohort for PR density, with a mean (±SD) value of 53,329 (±8106) cells/mm2 at 1° decreasing to 8669 (±737) cells/mm2 at 12°. We observed a power function relationship between eccentricity and both PR density and PR/RPE ratio. We found similar variability in our RPE density measures, with a mean value of 7335 (±681) cells/mm2 at 1° decreasing to 5547 (±356) cells/mm2 at 12°, exhibiting a linear relationship with a negative slope of -123 cells/mm2 per degree. OSL monotonically decreased from 33.3 (±2.4) µm at 1° to 18.0 (±1.8) µm at 12°, following a second-order polynomial relationship. PR/RPE ratio decreased from 7.3 (±0.9) µm at 1° to 1.5 (±0.1) µm at 12°. The normative data from this investigation will help lay a foundation for future studies of retinal pathology.
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Affiliation(s)
- Zhuolin Liu
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
| | - Samira Aghayee
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
| | - Somayyeh Soltanian-Zadeh
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
| | - Katherine Kovalick
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
| | - Anant Agrawal
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
| | - Osamah Saeedi
- Department of Ophthalmology, University of Maryland Baltimore School of Medicine, Baltimore, MD 21201, USA;
| | - Catherine Cukras
- Division of Epidemiology and Clinical Applications, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA (E.Y.C.)
| | - Emily Y. Chew
- Division of Epidemiology and Clinical Applications, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA (E.Y.C.)
| | - Sina Farsiu
- Department of Biomedical Engineering, Duke University, Durham, NC 27710, USA;
| | - Daniel X. Hammer
- Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA (S.S.-Z.); (A.A.)
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14
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Zhang T, Liao J, Zhang Y, Huang Z, Li C. Robust Ultrafast Projection Pipeline for Structural and Angiography Imaging of Fourier-Domain Optical Coherence Tomography. Diagnostics (Basel) 2024; 14:1509. [PMID: 39061645 PMCID: PMC11275292 DOI: 10.3390/diagnostics14141509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
The current methods to generate projections for structural and angiography imaging of Fourier-Domain optical coherence tomography (FD-OCT) are significantly slow for prediagnosis improvement, prognosis, real-time surgery guidance, treatments, and lesion boundary definition. This study introduced a robust ultrafast projection pipeline (RUPP) and aimed to develop and evaluate the efficacy of RUPP. RUPP processes raw interference signals to generate structural projections without the need for Fourier Transform. Various angiography reconstruction algorithms were utilized for efficient projections. Traditional methods were compared to RUPP using PSNR, SSIM, and processing time as evaluation metrics. The study used 22 datasets (hand skin: 9; labial mucosa: 13) from 8 volunteers, acquired with a swept-source optical coherence tomography system. RUPP significantly outperformed traditional methods in processing time, requiring only 0.040 s for structural projections, which is 27 times faster than traditional summation projections. For angiography projections, the best RUPP variation took 0.15 s, making it 7518 times faster than the windowed eigen decomposition method. However, PSNR decreased by 41-45% and SSIM saw reductions of 25-74%. RUPP demonstrated remarkable speed improvements over traditional methods, indicating its potential for real-time structural and angiography projections in FD-OCT, thereby enhancing clinical prediagnosis, prognosis, surgery guidance, and treatment efficacy.
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Affiliation(s)
| | | | | | | | - Chunhui Li
- Centre for Medical Engineering and Technology (CMET), School of Science and Engineering, University of Dundee, Dundee DD1 4HN, UK; (T.Z.); (J.L.); (Y.Z.); (Z.H.)
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15
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Shkolyar E, Zhou SR, Carlson CJ, Chang S, Laurie MA, Xing L, Bowden AK, Liao JC. Optimizing cystoscopy and TURBT: enhanced imaging and artificial intelligence. Nat Rev Urol 2024:10.1038/s41585-024-00904-9. [PMID: 38982304 DOI: 10.1038/s41585-024-00904-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2024] [Indexed: 07/11/2024]
Abstract
Diagnostic cystoscopy in combination with transurethral resection of the bladder tumour are the standard for the diagnosis, surgical treatment and surveillance of bladder cancer. The ability to inspect the bladder in its current form stems from a long chain of advances in imaging science and endoscopy. Despite these advances, bladder cancer recurrence and progression rates remain high after endoscopic resection. This stagnation is a result of the heterogeneity of cancer biology as well as limitations in surgical techniques and tools, as incomplete resection and provider-specific differences affect cancer persistence and early recurrence. An unmet clinical need remains for solutions that can improve tumour delineation and resection. Translational advances in enhanced cystoscopy technologies and artificial intelligence offer promising avenues to overcoming the progress plateau.
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Affiliation(s)
- Eugene Shkolyar
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Steve R Zhou
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Camella J Carlson
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Shuang Chang
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Mark A Laurie
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Lei Xing
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Audrey K Bowden
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
- Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN, USA
| | - Joseph C Liao
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA.
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
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16
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Lin K, Xu Z, Wang H, Wang Y, Wei L, Ma H, Zhao J, Lu F, Hu L. Comparison of the repeatability and reproducibility of corneal thickness mapping using optical coherence tomography according to tear film break-up time. BMC Ophthalmol 2024; 24:275. [PMID: 38970043 PMCID: PMC11227131 DOI: 10.1186/s12886-024-03536-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 06/23/2024] [Indexed: 07/07/2024] Open
Abstract
BACKGROUND To compare the repeatability and reproducibility of corneal and corneal epithelial thickness mapping using anterior segment optical coherence tomography (AS-OCT) according to tear film break-up time (TBUT). METHODS The included eyes were divided into three subgroups according to TBUT (group 1: TBUT ≤ 5 s, group 2: 5 s < TBUT ≤ 10 s, and group 3: TBUT > 10 s). All eyes were imaged separately thrice by two operators to obtain the thickness maps (TMs) of the cornea and corneal epithelium based on spatial zones encompassing a 9-mm-diameter area. Each TM consisted of 25 areas. Intraoperator (repeatability) and interoperator (reproducibility) standard deviations (Sws), coefficients of variation (CoVs), and intraclass correlation coefficients (ICCs) among the tests were calculated and compared in all the areas. RESULTS Altogether, 132 eyes of 67 subjects were included (50, 47, and 35 eyes in groups 1, 2, and 3; respectively). The ICCs of corneal epithelial thickness and corneal thickness were > 0.75 in most of the areas. Pairwise comparisons showed that AS-OCT exhibited lower repeatability in group 1 than in groups 2 and 3 (P < 0.05). However groups 2 and 3 showed similar results. Sws and CoVs of corneal epithelial thickness exhibited no significant interoperator differences. While no significant differences were observed in corneal thickness in most of the areas. CONCLUSIONS TBUT significantly influences the repeatability of corneal and corneal epithelial thickness measurements. Poor tear film stability requires careful evaluation of corneal epithelial thickness.
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Affiliation(s)
- Kan Lin
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
- Zhejiang University School of Medicine Second Affiliated Hospital Eye Center, 88 Jiefang Road, Hangzhou, 310009, China
| | - Zhiqiang Xu
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Hui Wang
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Yuzhou Wang
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Linzhi Wei
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Hongqing Ma
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Jian Zhao
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Fan Lu
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
- School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, 270 Xueyuan road, Wenzhou, 325000, Zhejiang, China.
| | - Liang Hu
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
- School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, 270 Xueyuan road, Wenzhou, 325000, Zhejiang, China.
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17
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Shwetabh K, Banerjee A, Poddar R, Kumar K. Assessment of NIR-triggered PEG-coated NaGdF 4:Tm 3+/Yb 3+bio-compatible upconversion nanoparticles for contrast enhancement in OCT imaging and optical thermometry. Biomed Mater 2024; 19:055001. [PMID: 38870928 DOI: 10.1088/1748-605x/ad580b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 06/13/2024] [Indexed: 06/15/2024]
Abstract
In this investigation, we embarked on the synthesis of polyethylene glycol coated NaGdF4:Tm3+/Yb3+upconversion nanoparticles (UCNPs), aiming to assess their utility in enhancing image contrast within the context of swept source optical coherence tomography (OCT) and photo-thermal OCT imaging. Our research unveiled the remarkable UC emissions stemming from the transitions of Tm3+ions, specifically the1G4→3H6transitions, yielding vibrant blue emissions at 472 nm. We delved further into the UC mechanism, meticulously scrutinizing decay times and the nanoparticles' capacity to convert radiation into heat. Notably, these nanoparticles exhibited an impressive photo-thermal conversion efficiency of 37.5%. Furthermore, our investigations into their bio-compatibility revealed a promising outcome, with more than 90% cell survival after 24 h of incubation with HeLa cells treated with UCNPs. The nanoparticles demonstrated a notable thermal sensitivity of 4.7 × 10-3K-1at 300 K, signifying their potential for precise temperature monitoring at the cellular level.
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Affiliation(s)
- Kumar Shwetabh
- Optical Materials and Bio-imaging Research Laboratory, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Abhishek Banerjee
- Biophotonics Lab, Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand 835215, India
| | - Raju Poddar
- Biophotonics Lab, Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand 835215, India
| | - Kaushal Kumar
- Optical Materials and Bio-imaging Research Laboratory, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
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18
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Zhang X, Zhong H, Wang S, He B, Cao L, Li M, Jiang M, Li Q. Subpixel motion artifacts correction and motion estimation for 3D-OCT. JOURNAL OF BIOPHOTONICS 2024:e202400104. [PMID: 38955360 DOI: 10.1002/jbio.202400104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/26/2024] [Accepted: 05/14/2024] [Indexed: 07/04/2024]
Abstract
A number of hardware-based and software-based strategies have been suggested to eliminate motion artifacts for improvement of 3D-optical coherence tomography (OCT) image quality. However, the hardware-based strategies have to employ additional hardware to record motion compensation information. Many software-based strategies have to need additional scanning for motion correction at the expense of longer acquisition time. To address this issue, we propose a motion artifacts correction and motion estimation method for OCT volumetric imaging of anterior segment, without requirements of additional hardware and redundant scanning. The motion correction effect with subpixel accuracy for in vivo 3D-OCT has been demonstrated in experiments. Moreover, the physiological information of imaging object, including respiratory curve and respiratory rate, has been experimentally extracted using the proposed method. The proposed method offers a powerful tool for scientific research and clinical diagnosis in ophthalmology and may be further extended for other biomedical volumetric imaging applications.
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Affiliation(s)
- Xiao Zhang
- School of Medical Technology, Beijing Institute of Technology, Beijing, China
| | - Haozhe Zhong
- School of Medical Technology, Beijing Institute of Technology, Beijing, China
| | - Sainan Wang
- Department of Anesthesiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Bin He
- State Key Laboratory of Low-dimensional Quantum Physics and Center for Atomic and Molecular Nanoscience, Department of Physics, Tsinghua University and Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - Liangqi Cao
- School of Medical Technology, Beijing Institute of Technology, Beijing, China
| | - Ming Li
- China-America Institute of Neuroscience and Beijing Institute of Geriatrics, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Miaowen Jiang
- Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China
| | - Qin Li
- School of Medical Technology, Beijing Institute of Technology, Beijing, China
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19
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Hong J, Zhu W, He K, Chen X, Lu J, Li P. Ergodic speckle contrast optical coherence tomography velocimetry of rapid blood flow. OPTICS LETTERS 2024; 49:3600-3603. [PMID: 38950219 DOI: 10.1364/ol.523063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 05/27/2024] [Indexed: 07/03/2024]
Abstract
Visualizing a 3D blood flow velocity field through noninvasive imaging is crucial for analyzing hemodynamic mechanisms in areas prone to disorders. However, traditional correlation-based optical coherence tomography (OCT) velocimetry techniques have a maximum measurable flow velocity depending on the A-line rate. We presented the ergodic speckle contrast OCT (ESCOCT) to break the bottleneck in measuring the rapid blood flow velocity. It achieved a measurement of blood flow velocity ranging from 9.5 to 280 mm/s using a 100 kHz swept-source (SS) OCT based on 100 A-repeats scanning mode. Addressing the non-ergodic problem of temporal OCT signals by integrating more consecutive A-scans, ESCOCT can enable the estimation for lower velocity flows by increasing A-repeats. ESCOCT provided a wide dynamic range with no upper limit on measuring blood flow velocity with an adequate signal-to-noise ratio and improved the sensitivity and accuracy of the hemodynamic assessment.
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20
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Iyer RR, Yang L, Sorrells JE, Chaney EJ, Spillman DR, Boppart SA. Dispersion mismatch correction for evident chromatic anomaly in low coherence interferometry. APL PHOTONICS 2024; 9:076114. [PMID: 39072189 PMCID: PMC11273218 DOI: 10.1063/5.0207414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Accepted: 07/02/2024] [Indexed: 07/30/2024]
Abstract
The applications of ultrafast optics to biomedical microscopy have expanded rapidly in recent years, including interferometric techniques like optical coherence tomography and microscopy (OCT/OCM). The advances of ultra-high resolution OCT and the inclusion of OCT/OCM in multimodal systems combined with multiphoton microscopy have marked a transition from using pseudo-continuous broadband sources, such as superluminescent diodes, to ultrafast supercontinuum optical sources. We report anomalies in the dispersion profiles of low-coherence ultrafast pulses through long and non-identical arms of a Michelson interferometer that are well beyond group delay or third-order dispersions. This chromatic anomaly worsens the observed axial resolution and causes fringe artifacts in the reconstructed tomograms in OCT/OCM using traditional algorithms. We present DISpersion COmpensation Techniques for Evident Chromatic Anomalies (DISCOTECA) as a universal solution to address the problem of chromatic dispersion mismatch in interferometry, especially with ultrafast sources. First, we demonstrate the origin of these artifacts through the self-phase modulation of ultrafast pulses due to focusing elements in the beam path. Next, we present three solution paradigms for DISCOTECA: optical, optoelectronic, and computational, along with quantitative comparisons to traditional methods to highlight the improvements to the dynamic range and axial profile. We explain the piecewise reconstruction of the phase mismatch between the arms of the spectral-domain interferometer using a modified short-term Fourier transform algorithm inspired by spectroscopic OCT. Finally, we present a decision-making guide for evaluating the utility of DISCOTECA in interferometry and for the artifact-free reconstruction of OCT images using an ultrafast supercontinuum source for biomedical applications.
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Affiliation(s)
| | | | | | | | | | - Stephen A. Boppart
- Author to whom correspondence should be addressed: . Tel.: (217) 244-7479
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21
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Watson JJ, Hecht R, Tao YK. Optimization of handheld spectrally encoded coherence tomography and reflectometry for point-of-care ophthalmic diagnostic imaging. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:076006. [PMID: 39050778 PMCID: PMC11267400 DOI: 10.1117/1.jbo.29.7.076006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 06/28/2024] [Accepted: 07/08/2024] [Indexed: 07/27/2024]
Abstract
Significance Handheld optical coherence tomography (HH-OCT) systems enable point-of-care ophthalmic imaging in bedridden, uncooperative, and pediatric patients. Handheld spectrally encoded coherence tomography and reflectometry (HH-SECTR) combines OCT and spectrally encoded reflectometry (SER) to address critical clinical challenges in HH-OCT imaging with real-time en face retinal aiming for OCT volume alignment and volumetric correction of motion artifacts that occur during HH-OCT imaging. Aim We aim to enable robust clinical translation of HH-SECTR and improve clinical ergonomics during point-of-care OCT imaging for ophthalmic diagnostics. Approach HH-SECTR is redesigned with (1) optimized SER optical imaging for en face retinal aiming and retinal tracking for motion correction, (2) a modular aluminum form factor for sustained alignment and probe stability for longitudinal clinical studies, and (3) one-handed photographer-ergonomic motorized focus adjustment. Results We demonstrate an HH-SECTR imaging probe with micron-scale optical-optomechanical stability and use it for in vivo human retinal imaging and volumetric motion correction. Conclusions This research will benefit the clinical translation of HH-SECTR for point-of-care ophthalmic diagnostics.
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Affiliation(s)
- Jacob J. Watson
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
| | - Rachel Hecht
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
| | - Yuankai K. Tao
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
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22
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Li Y, El Habib Daho M, Conze PH, Zeghlache R, Le Boité H, Tadayoni R, Cochener B, Lamard M, Quellec G. A review of deep learning-based information fusion techniques for multimodal medical image classification. Comput Biol Med 2024; 177:108635. [PMID: 38796881 DOI: 10.1016/j.compbiomed.2024.108635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 03/18/2024] [Accepted: 05/18/2024] [Indexed: 05/29/2024]
Abstract
Multimodal medical imaging plays a pivotal role in clinical diagnosis and research, as it combines information from various imaging modalities to provide a more comprehensive understanding of the underlying pathology. Recently, deep learning-based multimodal fusion techniques have emerged as powerful tools for improving medical image classification. This review offers a thorough analysis of the developments in deep learning-based multimodal fusion for medical classification tasks. We explore the complementary relationships among prevalent clinical modalities and outline three main fusion schemes for multimodal classification networks: input fusion, intermediate fusion (encompassing single-level fusion, hierarchical fusion, and attention-based fusion), and output fusion. By evaluating the performance of these fusion techniques, we provide insight into the suitability of different network architectures for various multimodal fusion scenarios and application domains. Furthermore, we delve into challenges related to network architecture selection, handling incomplete multimodal data management, and the potential limitations of multimodal fusion. Finally, we spotlight the promising future of Transformer-based multimodal fusion techniques and give recommendations for future research in this rapidly evolving field.
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Affiliation(s)
- Yihao Li
- LaTIM UMR 1101, Inserm, Brest, France; University of Western Brittany, Brest, France
| | - Mostafa El Habib Daho
- LaTIM UMR 1101, Inserm, Brest, France; University of Western Brittany, Brest, France.
| | | | - Rachid Zeghlache
- LaTIM UMR 1101, Inserm, Brest, France; University of Western Brittany, Brest, France
| | - Hugo Le Boité
- Sorbonne University, Paris, France; Ophthalmology Department, Lariboisière Hospital, AP-HP, Paris, France
| | - Ramin Tadayoni
- Ophthalmology Department, Lariboisière Hospital, AP-HP, Paris, France; Paris Cité University, Paris, France
| | - Béatrice Cochener
- LaTIM UMR 1101, Inserm, Brest, France; University of Western Brittany, Brest, France; Ophthalmology Department, CHRU Brest, Brest, France
| | - Mathieu Lamard
- LaTIM UMR 1101, Inserm, Brest, France; University of Western Brittany, Brest, France
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23
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Lambiri DW, Levin LA. Maculopapillary Bundle Degeneration in Optic Neuropathies. Curr Neurol Neurosci Rep 2024; 24:203-218. [PMID: 38833037 DOI: 10.1007/s11910-024-01343-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2024] [Indexed: 06/06/2024]
Abstract
PURPOSE OF REVIEW Degeneration of the maculopapillary bundle (MPB) is a prominent feature in a spectrum of optic neuropathies. MPB-selective degeneration is seen in specific conditions, such as nutritional and toxic optic neuropathies, Leber hereditary optic neuropathy (LHON), and dominant optic atrophy (DOA). Despite their distinct etiologies and clinical presentations, which encompass variations in age of incidence and monocular or binocular onset, these disorders share a core molecular mechanism: compromised mitochondrial homeostasis. This disruption is characterized by dysfunctions in mitochondrial metabolism, biogenesis, and protein synthesis. This article provides a comprehensive understanding of the MPB's role in optic neuropathies, emphasizing the importance of mitochondrial mechanisms in the pathogenesis of these conditions. RECENT FINDINGS Optical coherence tomography studies have characterized the retinal nerve fiber layer changes accompanying mitochondrial-affiliated optic neuropathies. Selective thinning of the temporal optic nerve head is preceded by thickening in early stages of these disorders which correlates with reductions in macular ganglion cell layer thinning and vascular atrophy. A recently proposed mechanism underpinning the selective atrophy of the MPB involves the positive feedback of reactive oxygen species generation as a common consequence of mitochondrial dysfunction. Additionally, new research has revealed that the MPB can undergo degeneration in the early stages of glaucoma, challenging the historically held belief that this area was not involved in this common optic neuropathy. A variety of anatomical risk factors influence the propensity of glaucomatous MPB degeneration, and cases present distinct patterns of ganglion cell degeneration that are distinct from those observed in mitochondria-associated diseases. This review synthesizes clinical and molecular research on primary MPB disorders, highlighting the commonalities and differences in their pathogenesis. KEY POINTS (BOX) 1. Temporal degeneration of optic nerve fibers accompanied by cecocentral scotoma is a hallmark of maculopapillary bundle (MPB) degeneration. 2. Mechanisms of MPB degeneration commonly implicate mitochondrial dysfunction. 3. Recent research challenges the traditional belief that the MPB is uninvolved in glaucoma by showing degeneration in the early stages of this common optic neuropathy, yet with features distinct from other MPB-selective neuropathies. 4. Reactive oxygen species generation is a mechanism linking mitochondrial mechanisms of MPB-selective optic neuropathies, but in-vivo and in-vitro studies are needed to validate this hypothesis.
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Affiliation(s)
- Darius W Lambiri
- Faculty of Medicine and Health Sciences, McGill University, Montreal, Canada
- Department of Ophthalmology and Visual Sciences, McGill University, Montreal, Canada
| | - Leonard A Levin
- Faculty of Medicine and Health Sciences, McGill University, Montreal, Canada.
- Department of Ophthalmology and Visual Sciences, McGill University, Montreal, Canada.
- Department of Neurology & Neurosurgery, McGill University, Montreal, Canada.
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24
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Baumann ME, Haddad NR, Salazar A, Childers WL, Farrokhi S, Goldstein NB, Hendershot BD, Reider L, Thompson RE, Valerio MS, Dearth CL, Garza LA. Testing the Reliability of Optical Coherence Tomography to Measure Epidermal Thickness and Distinguish Volar and Nonvolar Skin. JID INNOVATIONS 2024; 4:100276. [PMID: 38827331 PMCID: PMC11137746 DOI: 10.1016/j.xjidi.2024.100276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/17/2024] [Accepted: 02/06/2024] [Indexed: 06/04/2024] Open
Abstract
In persons with limb loss, prosthetic devices cause skin breakdown, largely because residual limb skin (nonvolar) is not intended to bear weight such as palmoplantar (volar) skin. Before evaluation of treatment efficacy to improve skin resiliency, efforts are needed to establish normative data and assess outcome metric reliability. The purpose of this study was to use optical coherence tomography to (i) characterize volar and nonvolar skin epidermal thickness and (ii) examine the reliability of optical coherence tomography. Four orientations of optical coherence tomography images were collected on 33 volunteers (6 with limb loss) at 2 time points, and the epidermis was traced to quantify thickness by 3 evaluators. Epidermal thickness was greater (P < .01) for volar skin (palm) (265.1 ± 50.9 μm, n = 33) than for both nonvolar locations: posterior thigh (89.8 ± 18.1 μm, n = 27) or residual limb (93.4 ± 27.4 μm, n = 6). The inter-rater intraclass correlation coefficient was high for volar skin (0.887-0.956) but low for nonvolar skin (thigh: 0.292-0.391, residual limb: 0.211-0.580). Correlation improved when comparing only 2 evaluators who used the same display technique (palm: 0.827-0.940, thigh: 0.633-0.877, residual limb: 0.213-0.952). Despite poor inter-rater agreement for nonvolar skin, perhaps due to challenges in identifying the dermal-epidermal junction, this study helps to support the utility of optical coherence tomography to distinguish volar from nonvolar skin.
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Affiliation(s)
- Molly E. Baumann
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Rehabilitation Medicine, Center for the Intrepid, Brooke Army Medical Center, San Antonio, Texas, USA
| | - Nina Rossa Haddad
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alyssa Salazar
- Department of Rehabilitation Medicine, Center for the Intrepid, Brooke Army Medical Center, San Antonio, Texas, USA
- The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
| | - W. Lee Childers
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Rehabilitation Medicine, Center for the Intrepid, Brooke Army Medical Center, San Antonio, Texas, USA
- Department of Physical Medicine & Rehabilitation, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Shawn Farrokhi
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Physical Therapy, Chapman University, Irvine, California, USA
| | - Neil B. Goldstein
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, Maryland, USA
| | - Brad D. Hendershot
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Physical Medicine & Rehabilitation, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
- Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, Maryland, USA
| | - Lisa Reider
- Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | | | - Michael S. Valerio
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Christopher L. Dearth
- Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, Virginia, USA
- Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, Maryland, USA
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Luis A. Garza
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, USA
- Department of Oncology, School of Medicine, Johns Hopkins University, Baltimore, USA
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25
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Macherey-Meyer S, Meertens MM, Heyne S, Braumann S, Tichelbäcker T, Wienemann H, Mauri V, Baldus S, Adler C, Lee S. Optical coherence tomography-guided versus angiography-guided percutaneous coronary intervention in acute coronary syndrome: a meta-analysis. Clin Res Cardiol 2024; 113:967-976. [PMID: 37524839 PMCID: PMC11219421 DOI: 10.1007/s00392-023-02272-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 07/19/2023] [Indexed: 08/02/2023]
Abstract
BACKGROUND Percutaneous coronary intervention (PCI) is standard of care in patients with acute coronary syndrome (ACS) suitable for interventional revascularization. Intracoronary imaging by optical coherence tomography (OCT) expanded treatment approaches adding diagnostic information and contributing to stent optimization. OBJECTIVES This meta-analysis aimed to assess the effects of OCT-guided vs. angiography-guided PCI in treatment of ACS. METHODS A structured literature search was performed. All controlled trials evaluating OCT-guided vs. angiography-guided PCI in patients with ACS were eligible. The primary end point was major adverse cardiac events (MACE). RESULTS Eight studies enrolling 2612 patients with ACS were eligible. 1263 patients underwent OCT-guided and 1,349 patients angiography-guided PCI. OCT guidance was associated with a 30% lower likelihood of MACE (OR 0.70, 95% CI 0.53-0.93, p = 0.01, I2 = 1%). OCT-guided PCI was also associated with significantly decreased cardiac mortality (OR 0.49, 95% CI 0.25-0.96, p = 0.04, I2 = 0%). There was no detectable difference in all-cause mortality (OR 1.08, 95% CI 0.51-2.31, p = 0.83, I2 = 0). Patients in OCT-guided group less frequently required target lesion revascularization (OR 0.26, 95% CI 0.07-0.95, p = 0.04, I2 = 0%). Analysis of myocardial infarction did not result in significant treatment differences. In subgroup or sensitivity analysis the observed advantages of OCT-guided PCI were not replicable. CONCLUSION The evidence suggests that PCI guidance with OCT in ACS decreases MACE, cardiac death and target lesion revascularization compared to angiography. On individual study level, in subgroup or sensitivity analyses these advantages were not thoroughly replicable.
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Affiliation(s)
- S Macherey-Meyer
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany.
| | - M M Meertens
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - S Heyne
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - S Braumann
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - T Tichelbäcker
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - H Wienemann
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - V Mauri
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - S Baldus
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - C Adler
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
| | - S Lee
- Faculty of Medicine, Clinic III for Internal Medicine, University of Cologne, University Hospital Cologne, Kerpener Straße 62, 50937, Cologne, Germany
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26
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Xu J, Zhu M, Tang P, Li J, Gao K, Qiu H, Zhao S, Lan G, Jia H, Yu B. Visualization enhancement by PCA-based image fusion for skin burns assessment in polarization-sensitive OCT. BIOMEDICAL OPTICS EXPRESS 2024; 15:4190-4205. [PMID: 39022536 PMCID: PMC11249677 DOI: 10.1364/boe.521399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 05/31/2024] [Accepted: 06/01/2024] [Indexed: 07/20/2024]
Abstract
Polarization-sensitive optical coherence tomography (PS-OCT) is a functional imaging tool for measuring tissue birefringence characteristics. It has been proposed as a potentially non-invasive technique for evaluating skin burns. However, the PS-OCT modality usually suffers from high system complexity and relatively low tissue-specific contrast, which makes assessing the extent of burns in skin tissue difficult. In this study, we employ an all-fiber-based PS-OCT system with single-state input, which is simple and efficient for skin burn assessment. Multiple parameters, such as phase retardation (PR), degree of polarization uniformity (DOPU), and optical axis orientation, are obtained to extract birefringent features, which are sensitive to subtle changes in structural arrangement and tissue composition. Experiments on ex vivo porcine skins burned at different temperatures were conducted for skin burn investigation. The burned depths estimated by PR and DOPU increase linearly with the burn temperature to a certain extent, which is helpful in classifying skin burn degrees. We also propose an algorithm of image fusion based on principal component analysis (PCA) to enhance tissue contrast for the multi-parameter data of PS-OCT imaging. The results show that the enhanced images generated by the PCA-based image fusion method have higher tissue contrast, compared to the en-face polarization images by traditional mean value projection. The proposed approaches in this study make it possible to assess skin burn severity and distinguish between burned and normal tissues.
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Affiliation(s)
- Jingjiang Xu
- Guangdong-Hong Kong-Macao Intelligent Micro-Nano Optoelectronic Technology Joint Laboratory, Foshan University
, Foshan, Guangdong 528000, China
- Innovation and Entrepreneurship Teams Project of Guangdong Pearl River Talents Program, Guangdong Weiren Meditech Co., Ltd., Foshan, Guangdong 528051, China
| | - Mingtao Zhu
- School of Mechatronic Engineering and Automation, Foshan University, Foshan, Guangdong 528000, China
| | - Peijun Tang
- College of Biophotonics, South China Normal University, Guangzhou 510006, China
| | - Junyun Li
- Department of Radiation Oncology, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
| | - Kai Gao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou 510060, China
| | - Haixia Qiu
- Department of Laser Medicine, the First Medical Centre, Chinese PLA General Hospital, Beijing 100853, China
| | - Shiyong Zhao
- Tianjin Hengyu Medical Technology Co., Ltd., Tianjin 300000, China
| | - Gongpu Lan
- Guangdong-Hong Kong-Macao Intelligent Micro-Nano Optoelectronic Technology Joint Laboratory, Foshan University
, Foshan, Guangdong 528000, China
- Innovation and Entrepreneurship Teams Project of Guangdong Pearl River Talents Program, Guangdong Weiren Meditech Co., Ltd., Foshan, Guangdong 528051, China
| | - Haibo Jia
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Bo Yu
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
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27
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Kalloniatis M, Wang H, Phu J, Tong J, Armitage J. Optical coherence tomography angiography in the diagnosis of ocular disease. Clin Exp Optom 2024; 107:482-498. [PMID: 38452795 DOI: 10.1080/08164622.2024.2323603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 02/21/2024] [Indexed: 03/09/2024] Open
Abstract
Clinical imaging provided by optical coherence tomography (OCT) and its variant, OCT-angiography (OCT-A), has revolutionised eyecare practice. The imaging techniques allow for the identification and quantification of ocular structures, supporting the diagnosis and prognosis of eye disease. In this review, an overview of the usefulness of OCT-A imaging in the diagnosis and management of a range of ocular conditions is provided when used in isolation or in combination with other imaging modalities and measures of visual function (visual field results). OCT-A imaging has the capacity to identify and quantify ocular vasculature non-invasively, thereby assisting the clinician in the diagnosis or to determine the efficacy of intervention in ocular conditions impacting retinal vasculature. Thus, additional clinically useful information can be obtained in eye diseases involving conditions such as those impacting retinal vessel occlusion, in diabetic retinopathy, inherited retinal dystrophy, age-related macular degeneration, choroidal neovascularisation and optic nerve disorders. Through a clinical case series, various ocular conditions are reviewed, and the impact of OCT-A imaging is discussed. Although OCT-A imaging has great promise and is already used in clinical management, there is a lack of set standards to characterise altered vascular features in disease and consequently for prognostication, primarily due to a lack of large-scale clinical trials and variability in OCT-A algorithms when generating quantitative parameters.
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Affiliation(s)
- Michael Kalloniatis
- School of Medicine (Optometry), Deakin University, Waurn Ponds, VIC, Australia
- School of Optometry and Vision Science, University of New South Wales, Kensington, NSW, Australia
| | - Henrietta Wang
- School of Optometry and Vision Science, University of New South Wales, Kensington, NSW, Australia
- Centre for Eye Health, University of New South Wales, Kensington, NSW, Australia
| | - Jack Phu
- School of Medicine (Optometry), Deakin University, Waurn Ponds, VIC, Australia
- School of Optometry and Vision Science, University of New South Wales, Kensington, NSW, Australia
| | - Janelle Tong
- School of Optometry and Vision Science, University of New South Wales, Kensington, NSW, Australia
- Centre for Eye Health, University of New South Wales, Kensington, NSW, Australia
| | - James Armitage
- School of Medicine (Optometry), Deakin University, Waurn Ponds, VIC, Australia
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28
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Lujan BJ, Griffin S, Makhijani VS, Antony BJ, Chew EY, Roorda A, McDonald HR. DIRECTIONAL OPTICAL COHERENCE TOMOGRAPHY IMAGING OF MACULAR PATHOLOGY. Retina 2024; 44:1124-1133. [PMID: 38564762 PMCID: PMC11189747 DOI: 10.1097/iae.0000000000004105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 02/22/2024] [Indexed: 04/04/2024]
Abstract
PURPOSE To survey the impact of directional reflectivity on structures within optical coherence tomography images in retinal pathology. METHODS Sets of commercial optical coherence tomography images taken from multiple pupil positions were analyzed. These directional optical coherence tomography sets revealed directionally reflective structures within the retina. After ensuring sufficient image quality, resulting hybrid and composite images were characterized by assessing the Henle fiber layer, outer nuclear layer, ellipsoid zone, and interdigitation zone. Additionally, hybrid images were reviewed for novel directionally reflective pathological features. RESULTS Cross-sectional directional optical coherence tomography image sets were obtained in 75 eyes of 58 patients having a broad range of retinal pathologies. All cases showed improved visualization of the outer nuclear layer/Henle fiber layer interface, and outer nuclear layer thinning was, therefore, more apparent in several cases. The ellipsoid zone and interdigitation zone also demonstrated attenuation where a geometric impact of underlying pathology affected their orientation. Misdirected photoreceptors were also noted as a consistent direction-dependent change in ellipsoid zone reflectivity between regions of normal and absent ellipsoid zone. CONCLUSION Directional optical coherence tomography enhances the understanding of retinal anatomy and pathology. This optical contrast yields more accurate identification of retinal structures and possible imaging biomarkers for photoreceptor-related pathology.
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Affiliation(s)
- Brandon J. Lujan
- Casey Eye Institute, Oregon Health & Science University, 545 SW Campus Drive, Portland, OR 97239
| | - Shane Griffin
- Department of Ophthalmology, California Pacific Medical Center, 711 Van Ness Avenue, Suite 250, San Francisco, CA 94102
| | - Vikram S. Makhijani
- Department of Ophthalmology, Southern California Permanente Medical Group, 3782 W Martin Luther King Jr, Los Angeles, CA 90008
| | - Bhavna J. Antony
- Federation University Australia, University Dr, Mount Helen VIC 3350, Australia
| | - Emily Y. Chew
- National Eye Institute, 31 Center Drive MSC 2510, Bethesda, MD 20892
| | - Austin Roorda
- Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley, 485 Minor Hall, Berkeley, CA 94720
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29
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Chen K, Swanson S, Bizheva K. Line-field dynamic optical coherence tomography platform for volumetric assessment of biological tissues. BIOMEDICAL OPTICS EXPRESS 2024; 15:4162-4175. [PMID: 39022542 PMCID: PMC11249681 DOI: 10.1364/boe.527797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/31/2024] [Accepted: 05/31/2024] [Indexed: 07/20/2024]
Abstract
Dynamic optical coherence tomography (dOCT) utilizes time-dependent signal intensity fluctuations to enhance contrast in OCT images and indirectly probe physiological processes in cells. Majority of the dOCT studies published so far are based on acquisition of 2D images (B-scans or C-scans) by utilizing point-scanning Fourier domain (spectral or swept-source) OCT or full-field OCT respectively, primarily due to limitations in the image acquisition rate. Here we introduce a novel, high-speed spectral domain line-field dOCT (SD-LF-dOCT) system and image acquisition protocols designed for fast, volumetric dOCT imaging of biological tissues. The imaging probe is based on an exchangeable afocal lens pair that enables selection of combinations of transverse resolution (from 1.1 µm to 6.4 µm) and FOV (from 250 × 250 µm2 to 1.4 × 1.4 mm2), suitable for different biomedical applications. The system offers axial resolution of ∼ 1.9 µm in biological tissue, assuming an average refractive index of 1.38. Maximum sensitivity of 90.5 dB is achieved for 3.5 mW optical imaging power at the tissue surface and maximum camera acquisition rate of 2,000 fps. Volumetric dOCT images acquired with the SD-LF-dOCT system from plant tissue (cucumber), animal tissue (mouse liver) and human prostate carcinoma spheroids allow for volumetric visualization of the tissues' cellular and sub-cellular structures and assessment of cellular motility.
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Affiliation(s)
- Keyu Chen
- Department of Physics and Astronomy, University of Waterloo, Waterloo N2 L 3G1, ON, Canada
| | - Stephanie Swanson
- Department of Physics and Astronomy, University of Waterloo, Waterloo N2 L 3G1, ON, Canada
| | - Kostadinka Bizheva
- Department of Physics and Astronomy, University of Waterloo, Waterloo N2 L 3G1, ON, Canada
- School of Optometry and Vision Sciences, University of Waterloo, Waterloo, ON, Canada
- System Design Engineering Department, University of Waterloo, Waterloo, ON, Canada
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30
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Kinoshita D, Suzuki K, Yuki H, Niida T, Fujimoto D, Minami Y, Dey D, Lee H, McNulty I, Ako J, Ferencik M, Kakuta T, Ye JC, Jang IK. Coronary plaque phenotype associated with positive remodeling. J Cardiovasc Comput Tomogr 2024; 18:401-407. [PMID: 38677958 DOI: 10.1016/j.jcct.2024.04.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/04/2024] [Accepted: 04/19/2024] [Indexed: 04/29/2024]
Abstract
BACKGROUND Positive remodeling is an integral part of the vascular adaptation process during the development of atherosclerosis, which can be detected by coronary computed tomography angiography (CTA). METHODS A total of 426 patients who underwent both coronary CTA and optical coherence tomography (OCT) were included. Four machine learning (ML) models, gradient boosting machine (GBM), random forest (RF), deep learning (DL), and support vector machine (SVM), were employed to detect specific plaque features. A total of 15 plaque features assessed by OCT were analyzed. The variable importance ranking was used to identify the features most closely associated with positive remodeling. RESULTS In the variable importance ranking, lipid index and maximal calcification arc were consistently ranked high across all four ML models. Lipid index and maximal calcification arc were correlated with positive remodeling, showing pronounced influence at the lower range and diminishing influence at the higher range. Patients with more plaques with positive remodeling throughout their entire coronary trees had higher low-density lipoprotein cholesterol levels and were associated with a higher incidence of cardiovascular events during 5-year follow-up (Hazard ratio 2.10 [1.26-3.48], P = 0.004). CONCLUSION Greater lipid accumulation and less calcium burden were important features associated with positive remodeling in the coronary arteries. The number of coronary plaques with positive remodeling was associated with a higher incidence of cardiovascular events.
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Affiliation(s)
- Daisuke Kinoshita
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Keishi Suzuki
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Haruhito Yuki
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Takayuki Niida
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Daichi Fujimoto
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Yoshiyasu Minami
- Department of Cardiovascular Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Damini Dey
- Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Hang Lee
- Biostatistics Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Iris McNulty
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Junya Ako
- Department of Cardiovascular Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Maros Ferencik
- Knight Cardiovascular Institute, Oregon Health and Science University, Portland, OR, USA
| | - Tsunekazu Kakuta
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital, Tsuchiura, Ibaraki, Japan.
| | - Jong Chul Ye
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea; Kim Jaechul Graduate School of Artificial Intelligence, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
| | - Ik-Kyung Jang
- Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
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31
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Kalmar CL, Malphrus EL, Blum JD, Kosyk MS, Zapatero ZD, Heuer GG, Bartlett SP, Taylor JA, Lang SS, Swanson JW. Intracranial Pressure Patterns in Children with Sagittal Craniosynostosis. Plast Reconstr Surg 2024; 154:135e-145e. [PMID: 37285193 DOI: 10.1097/prs.0000000000010797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
BACKGROUND Elevated intracranial pressure (ICP) in sagittal craniosynostosis has a wide spectrum of reported incidence, and patterns are not well understood across infancy and childhood. Characterizing the natural history of ICP in this population may clarify risks for neurocognitive delay and inform treatment decisions. METHODS Infants and children with sagittal craniosynostosis and unaffected control subjects were prospectively evaluated with spectral-domain optical coherence tomography from 2014 to 2021. Elevated ICP was determined based on previously validated algorithms using retinal optical coherence tomography parameters. RESULTS Seventy-two patients with isolated sagittal craniosynostosis and 25 control subjects were evaluated. Overall, 31.9% ( n = 23) of patients with sagittal craniosynostosis had evidence of ICP greater than or equal to 15 mmHg, and 27.8% ( n = 20) of patients had ICP greater than or equal to 20 mmHg. Children with sagittal craniosynostosis younger than 6 months were more likely to have normal ICP (88.6% <15 mmHg; 91.4% <20 mmHg) than those aged between 6 and 12 months (54.5%, P = 0.013; 54.5%, P = 0.005) than those older than 12 months (46.2%, P < 0.001; 53.8%, P = 0.001). ICP was directly correlated with severity of scaphocephaly ( P = 0.009). No unaffected control subjects at any age exhibited retinal thickening suggestive of elevated ICP. CONCLUSION Elevated ICP is rare in isolated sagittal craniosynostosis younger than 6 months, but it becomes significantly more common after 6 months of age, and may correlate with severity of scaphocephaly. CLINICAL QUESTION/LEVEL OF EVIDENCE Risk, II.
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Affiliation(s)
| | | | - Jessica D Blum
- From the Divisions of Plastic and Reconstructive Surgery
| | | | | | | | | | - Jesse A Taylor
- From the Divisions of Plastic and Reconstructive Surgery
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32
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Munteanu IR, Luca RE, Hogea E, Erdelyi RA, Duma VF, Marsavina L, Globasu AL, Constantin GD, Todea DC. Microbiological and Imaging-Based Evaluations of Photodynamic Therapy Combined with Er:YAG Laser Therapy in the In Vitro Decontamination of Titanium and Zirconia Surfaces. Microorganisms 2024; 12:1345. [PMID: 39065113 PMCID: PMC11278944 DOI: 10.3390/microorganisms12071345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 06/25/2024] [Accepted: 06/26/2024] [Indexed: 07/28/2024] Open
Abstract
The oral cavity's soft and hard tissues create a conducive environment for microbial proliferation and biofilm development, facilitating the colonization of prosthodontic and implant materials such as titanium (Ti) and zirconia (Zr). This study aimed to compare the efficacy of conventional decontamination methodologies (i.e., chemical and mechanical, using 0.12% digluconate chlorhexidine (CHX) solution-treatment and airflow) to adjunctive laser-based interventions on Ti and Zr substrates inoculated with Staphylococcus (S.) aureus ATCC 25923. Additionally, this investigation sought to elucidate the impact of these treatments on temperature variations and surface integrity, analyzing the laser irradiation effects on these prevalent dental materials. Experimental configurations were delineated for both Ti and Zr samples across four groups: (1) a conventional treatment group (CV); (2) a photodynamic therapy group (PDT); (3) an Er:YAG laser treatment group (Er); (4) a combined PDT and Er:YAG treatment group (PDTEr). Also, a negative control group (C) that received no treatment was considered. The decontamination of the inoculated disc samples was evaluated by quantifying the microbial colonies in colony-forming units per milliliter (CFU/mL). Temperature variations on the surface of the samples were determined during laser treatments. Surface modifications were investigated using scanning electron microscopy (SEM) and optical coherence tomography (OCT). For statistical analysis, Fisher 95% confidence intervals, Hsu's MCB method, and the Kruskal-Wallis test were applied. With regard to the 105 CFU/mL of the negative control group, results indicated average values equal for each study group to (1) 2.66 CFU/mL for Ti and 2 CFU/mL for Zr for the CV group; (2) 0.33 CFU/mL for Ti and 1 CFU/mL for Zr for the PDT group; (3) 1.25 CFU/mL for Ti and 0 CFU/mL for Zr for the Er group; (4), and 0 CFU/mL for both Ti and Zr for the PDTEr group. Therefore, the combined PDT and Er:YAG treatment (PDTEr) and the singular PDT modality outperformed conventional decontamination methods in eradicating S. aureus biofilms from both Ti and Zr surfaces. Notably, the PDTEr regime achieved a comprehensive elimination of microbial colonies on treated substrates. Surface examination employing OCT demonstrated discernible alterations in the surface morphology of samples subjected to Er:YAG and combined PDT and Er:YAG treatments. Temperature checks during treatments showed no major changes, suggesting the applied laser methods are safe. In conclusion, PDTEr and PDT eliminated bacteria more effectively, but Zr surfaces were more resilient, making them better for microbe-controlling applications. Also, the study demonstrated that the (less costly but lower resolution) OCT method can replace SEM for such investigations.
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Affiliation(s)
- Ioana-Roxana Munteanu
- University Clinic of Oral Rehabilitation and Dental Emergencies, Faculty of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania; (I.-R.M.); (D.C.T.)
- Interdisciplinary Research Center for Dental Medical Research, Lasers and Innovative Technologies, 300070 Timisoara, Romania
| | - Ruxandra-Elena Luca
- University Clinic of Oral Rehabilitation and Dental Emergencies, Faculty of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania; (I.-R.M.); (D.C.T.)
- Interdisciplinary Research Center for Dental Medical Research, Lasers and Innovative Technologies, 300070 Timisoara, Romania
| | - Elena Hogea
- Department XIV, Discipline of Microbiology-Virology, Faculty of General Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania;
| | - Ralph-Alexandru Erdelyi
- Department of Measurements and Optical Electronics, Faculty of Electronics, Telecommunications and Information Technology, Polytechnic University Timisoara, 300006 Timisoara, Romania;
| | - Virgil-Florin Duma
- Department of Measurements and Optical Electronics, Faculty of Electronics, Telecommunications and Information Technology, Polytechnic University Timisoara, 300006 Timisoara, Romania;
- Center of Research and Development for Mechatronics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania
- 3OM Optomechatronics Group, Faculty of Engineering, “Aurel Vlaicu” University of Arad, 310177 Arad, Romania
| | - Liviu Marsavina
- Department of Mechanics and Strength of Materials, Faculty of Mechanical Engineering, Polytechnic University Timisoara, 300222 Timisoara, Romania;
| | - Amelia-Larisa Globasu
- University Clinic of Pedodontics, Faculty of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania;
| | - George-Dumitru Constantin
- Department of Internal Medicine, Discipline of Clinical Skills, Faculty of General Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania;
- Advanced Cardiology and Hemostaseology Research Center, 300070 Timisoara, Romania
| | - Darinca Carmen Todea
- University Clinic of Oral Rehabilitation and Dental Emergencies, Faculty of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania; (I.-R.M.); (D.C.T.)
- Interdisciplinary Research Center for Dental Medical Research, Lasers and Innovative Technologies, 300070 Timisoara, Romania
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Urrego DF, Machado GJ, Torres JP. Non-mechanical steering of the optical beam in spectral-domain optical coherence tomography. Sci Rep 2024; 14:14860. [PMID: 38937546 PMCID: PMC11211445 DOI: 10.1038/s41598-024-65125-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 06/17/2024] [Indexed: 06/29/2024] Open
Abstract
We demonstrate in a proof-of-concept experiment spectral-domain optical coherence tomography where steering of the optical beam that probes the sample in a transverse scan does not make use of any mechanical element. Steering is done with the help of a phase-only spatial light modulator, that introduces a spatially-dependent phase between the two orthogonal polarization components of an optical beam, and some optical elements that control the polarization of light. We demonstrate that making use of the non-mechanical beam steering system considered here, we can reproduce the main traits of imaging with standard OCT that makes use of mechanical-assisted optical beam steering.
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Affiliation(s)
- Daniel F Urrego
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Barcelona, Spain.
| | - Gerard J Machado
- Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK
| | - Juan P Torres
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Barcelona, Spain
- Department of Signal Theory and Communications, Universitat Politecnica de Catalunya, 08034, Barcelona, Spain
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Zebrauskaite A, Tsybulskyi E, Simanauskas I, Zebrauskaite G, Ziubryte G, Ordiene R, Unikas R, Jarusevicius G, Harding SA. Investigations of injection strategies to use heparinized normal saline instead of contrast media for intracoronary optical coherence tomography imaging. Perfusion 2024:2676591241264116. [PMID: 38907368 DOI: 10.1177/02676591241264116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/24/2024]
Abstract
BACKGROUND The benefits of intravascular imaging-guided percutaneous coronary interventions (PCI) are well established. Intravascular imaging guidance improves short- and long-term outcomes, especially in complex PCI. Optical coherence tomography (OCT) has a higher resolution than intravascular ultrasound. However, the usage of OCT is mainly limited by the need to use contrast for flushing injections, which increases the risk of contrast-induced acute kidney injury, especially in patients with underlying chronic kidney disease. The aim of this study was to prove that flushing techniques with normal saline instead of contrast can be used in OCT imaging and can generate high-quality images. METHODS This prospective single-center observational study included patients with indications for OCT-guided PCI. For OCT pullbacks, heparinized saline was injected by an automatic pump injector at different rates, and additional extension catheters for selective coronary artery engagement were used at the operator's discretion. Recordings were made using the Ilumien Optis OCT system (Abbott) and the Dragonfly (Abbott) catheter and were analyzed at 1-mm intervals by two operators. Pullbacks were categorized as having optimal, acceptable, or unacceptable imaging quality. A clinically usable run was determined if >75% of the region of interest length was described as having optimal or acceptable imaging quality. RESULTS A total of 32 patients were enrolled in the study; 47 different lesions were assessed before and after PCI. In total, 91.5% of runs were described as clinically suitable for use. CONCLUSION Heparinized saline injections for OCT imaging are effective in generating good-quality OCT images suitable for clinical use.
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Affiliation(s)
- Aiste Zebrauskaite
- Department of Cardiology, Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Kaunas, Lithuania
- Faculty of Medicine, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Eduard Tsybulskyi
- Faculty of Medicine, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Ignas Simanauskas
- Faculty of Medicine, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Gabriele Zebrauskaite
- Faculty of Medicine, Lithuanian University of Health Sciences, Kaunas, Lithuania
- Department of Cardiology, Kaunas Hospital of Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Greta Ziubryte
- Department of Cardiology, Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Kaunas, Lithuania
- Department of Cardiology, Kaunas Hospital of Lithuanian University of Health Sciences, Kaunas, Lithuania
- Institute of Cardiology, Kaunas, Lithuania
| | - Rasa Ordiene
- Department of Cardiology, Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Kaunas, Lithuania
| | - Ramunas Unikas
- Department of Cardiology, Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Kaunas, Lithuania
- Faculty of Medicine, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Gediminas Jarusevicius
- Department of Cardiology, Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Kaunas, Lithuania
- Department of Cardiology, Kaunas Hospital of Lithuanian University of Health Sciences, Kaunas, Lithuania
- Institute of Cardiology, Kaunas, Lithuania
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Oh A, Harman CD, Koehl KL, Huang J, Teixeira LBC, Occelli LM, Storey ES, Ying GS, Komáromy AM. Assessment of Early Glaucomatous Optic Neuropathy in the Dog by Spectral Domain Optical Coherence Tomography (SD-OCT). MICROMACHINES 2024; 15:780. [PMID: 38930749 PMCID: PMC11206026 DOI: 10.3390/mi15060780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/07/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024]
Abstract
BACKGROUND Inherited primary open-angle glaucoma (POAG) in Beagle dogs is a well-established large animal model of glaucoma and is caused by a G661R missense mutation in the ADAMTS10 gene. Using this model, the study describes early clinical disease markers for canine glaucoma. METHODS Spectral-domain optical coherence tomography (SD-OCT) was used to assess nine adult, ADAMTS10-mutant (median age 45.6 months, range 28.8-52.8 months; mean diurnal intraocular pressure (IOP): 29.9 +/- SEM 0.44 mmHg) and three related age-matched control Beagles (mean diurnal IOP: 18.0 +/- SEM 0.53 mmHg). RESULTS Of all the optic nerve head (ONH) parameters evaluated, the loss of myelin peak height in the horizontal plane was most significant (from 154 +/- SEM 38.4 μm to 9.3 +/- SEM 22.1 μm; p < 0.01). There was a strong significant negative correlation between myelin peak height and IOP (Spearman correlation: -0.78; p < 0.003). There were no significant differences in the thickness of any retinal layers evaluated. CONCLUSIONS SD-OCT is a useful tool to detect early glaucomatous damage to the ONH in dogs before vision loss. Loss in myelin peak height without inner retinal thinning was identified as an early clinical disease marker. This suggests that initial degenerative changes are mostly due to the loss of myelin.
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Affiliation(s)
- Annie Oh
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA; (C.D.H.); (K.L.K.); (L.M.O.)
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA
| | - Christine D. Harman
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA; (C.D.H.); (K.L.K.); (L.M.O.)
| | - Kristin L. Koehl
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA; (C.D.H.); (K.L.K.); (L.M.O.)
| | - Jiayan Huang
- Department of Ophthalmology, Scheie Eye Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (J.H.); (G.-S.Y.)
| | - Leandro B. C. Teixeira
- Comparative Ocular Pathology Laboratory of Wisconsin, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA;
| | - Laurence M. Occelli
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA; (C.D.H.); (K.L.K.); (L.M.O.)
| | - Eric S. Storey
- Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA;
| | - Gui-Shuang Ying
- Department of Ophthalmology, Scheie Eye Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (J.H.); (G.-S.Y.)
| | - András M. Komáromy
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA; (C.D.H.); (K.L.K.); (L.M.O.)
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Chow DJX, Tan TCY, Upadhya A, Lim M, Dholakia K, Dunning KR. Viewing early life without labels: optical approaches for imaging the early embryo†. Biol Reprod 2024; 110:1157-1174. [PMID: 38647415 PMCID: PMC11180623 DOI: 10.1093/biolre/ioae062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/26/2024] [Accepted: 04/18/2024] [Indexed: 04/25/2024] Open
Abstract
Embryo quality is an important determinant of successful implantation and a resultant live birth. Current clinical approaches for evaluating embryo quality rely on subjective morphology assessments or an invasive biopsy for genetic testing. However, both approaches can be inherently inaccurate and crucially, fail to improve the live birth rate following the transfer of in vitro produced embryos. Optical imaging offers a potential non-invasive and accurate avenue for assessing embryo viability. Recent advances in various label-free optical imaging approaches have garnered increased interest in the field of reproductive biology due to their ability to rapidly capture images at high resolution, delivering both morphological and molecular information. This burgeoning field holds immense potential for further development, with profound implications for clinical translation. Here, our review aims to: (1) describe the principles of various imaging systems, distinguishing between approaches that capture morphological and molecular information, (2) highlight the recent application of these technologies in the field of reproductive biology, and (3) assess their respective merits and limitations concerning the capacity to evaluate embryo quality. Additionally, the review summarizes challenges in the translation of optical imaging systems into routine clinical practice, providing recommendations for their future development. Finally, we identify suitable imaging approaches for interrogating the mechanisms underpinning successful embryo development.
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Affiliation(s)
- Darren J X Chow
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, Australia
- Centre of Light for Life, The University of Adelaide, Adelaide, Australia
| | - Tiffany C Y Tan
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, Australia
| | - Avinash Upadhya
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, Australia
- Centre of Light for Life, The University of Adelaide, Adelaide, Australia
- School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Megan Lim
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, Australia
- Centre of Light for Life, The University of Adelaide, Adelaide, Australia
- School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Kishan Dholakia
- Centre of Light for Life, The University of Adelaide, Adelaide, Australia
- School of Biological Sciences, The University of Adelaide, Adelaide, Australia
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews, United Kingdom
| | - Kylie R Dunning
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, Australia
- Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, Australia
- Centre of Light for Life, The University of Adelaide, Adelaide, Australia
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Komatsu H, Akasaka M, Morita M, Usami K, Inagaki M, Kumashiro K, Tsubota K, Usui Y, Goto H, Kobayashi Y. A Pilot Study to Evaluate the Usefulness of Optical Coherence Tomography for Staging Iris Pigmented Lesions in Cats. Vet Sci 2024; 11:261. [PMID: 38922008 PMCID: PMC11209344 DOI: 10.3390/vetsci11060261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/28/2024] [Accepted: 06/04/2024] [Indexed: 06/27/2024] Open
Abstract
This study investigated the utility of optical coherence tomography (OCT) for staging iris pigmented lesions in cats. Eighteen cats that underwent OCT examination for unilateral iris pigmented lesion were included. The cats were either suspected of melanosis due to clinical features (n = 8) or had been definitively diagnosed through histopathology with iris melanosis (n = 3), early feline diffuse iris melanoma (FDIM) (n = 4), or mid-stage or advanced FDIM (n = 3). From OCT images, mean iris thickness (MIT) was measured, and the ratio of pigmented lesion to normal iris (PN) was calculated. OCT images depicted the entire iris layer in all eyes with suspected melanosis, iris melanosis, and early FDIM, but observing the entire lesion in mid-stage/advanced FDIM was challenging. No significant difference in MIT was observed among the groups. Conversely, PN ratio was significantly higher (p < 0.05) in early FDIM (1.29 ± 0.16) than in suspected melanosis (1.02 ± 0.10) or iris melanosis (0.99 ± 0.09). Furthermore, OCT imaging revealed hyperreflective lines in 75% of eyes with suspected melanosis and in all the eyes with iris melanosis, corresponding to the pigmented lesions. Our results demonstrate that OCT is capable of detecting subtle differences in iris thickness and features in early-stage FDIM, indicating its potential utility in distinguishing between iris melanosis and early FDIM. Further study is warranted to verify the reliability of such OCT findings.
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Affiliation(s)
- Hiroyuki Komatsu
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
- Department of Ophthalmology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku, Tokyo 160-0023, Japan
| | - Minori Akasaka
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
| | - Maresuke Morita
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
| | - Kensuke Usami
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
| | - Mao Inagaki
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
| | - Kayo Kumashiro
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
| | - Kinya Tsubota
- Department of Ophthalmology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku, Tokyo 160-0023, Japan
| | - Yoshihiko Usui
- Department of Ophthalmology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku, Tokyo 160-0023, Japan
| | - Hiroshi Goto
- Department of Ophthalmology, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku, Tokyo 160-0023, Japan
| | - Yoshitaka Kobayashi
- Animal Eye Care Tokyo Animal Eye Clinic, 1-1-3 Kaminoge, Setagaya, Tokyo 158-0093, Japan (Y.K.)
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Sharma S, Kalyani N, Dutta T, Velázquez-González JS, Llamas-Garro I, Ung B, Bas J, Dubey R, Mishra SK. Optical Devices for the Diagnosis and Management of Spinal Cord Injuries: A Review. BIOSENSORS 2024; 14:296. [PMID: 38920599 PMCID: PMC11201428 DOI: 10.3390/bios14060296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 05/21/2024] [Accepted: 06/02/2024] [Indexed: 06/27/2024]
Abstract
Throughout the central nervous system, the spinal cord plays a very important role, namely, transmitting sensory and motor information inwardly so that it can be processed by the brain. There are many different ways this structure can be damaged, such as through traumatic injury or surgery, such as scoliosis correction, for instance. Consequently, damage may be caused to the nervous system as a result of this. There is no doubt that optical devices such as microscopes and cameras can have a significant impact on research, diagnosis, and treatment planning for patients with spinal cord injuries (SCIs). Additionally, these technologies contribute a great deal to our understanding of these injuries, and they are also essential in enhancing the quality of life of individuals with spinal cord injuries. Through increasingly powerful, accurate, and minimally invasive technologies that have been developed over the last decade or so, several new optical devices have been introduced that are capable of improving the accuracy of SCI diagnosis and treatment and promoting a better quality of life after surgery. We aim in this paper to present a timely overview of the various research fields that have been conducted on optical devices that can be used to diagnose spinal cord injuries as well as to manage the associated health complications that affected individuals may experience.
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Affiliation(s)
- Sonika Sharma
- Department of Physics, Graphic Era Hill University, Dehradun 248002, Uttarakhand, India;
| | - Neeti Kalyani
- Department of Biotechnology and Biomedicine, Denmark Technical University, 2800 Kongens Lyngby, Denmark;
| | - Taposhree Dutta
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howarh 711103, West Bengal, India;
| | - Jesús Salvador Velázquez-González
- Navigation and Positioning, Center Technologic de Telecomunicacions de Catalunya (CTTC), Avinguda Carl Friedrich Gauss, 11, 08860 Castelldefels, Spain; (J.S.V.-G.); (I.L.-G.)
| | - Ignacio Llamas-Garro
- Navigation and Positioning, Center Technologic de Telecomunicacions de Catalunya (CTTC), Avinguda Carl Friedrich Gauss, 11, 08860 Castelldefels, Spain; (J.S.V.-G.); (I.L.-G.)
| | - Bora Ung
- Electrical Engineering Department, Ecole de Technologie Superieure, Montreal, QC H3C 1K3, Canada;
| | - Joan Bas
- Space and Resilient Communications and Systems (SRCOM), Center Technologic de Telecomunicacions de Catalunya (CTTC), Avinguda Carl Friedrich Gauss, 11, 08860 Castelldefels, Spain;
| | - Rakesh Dubey
- Institute of Physics, University of Szczecin, 70-453 Szczecin, Poland;
| | - Satyendra K. Mishra
- Space and Resilient Communications and Systems (SRCOM), Center Technologic de Telecomunicacions de Catalunya (CTTC), Avinguda Carl Friedrich Gauss, 11, 08860 Castelldefels, Spain;
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Valmaggia P, Cattin PC, Sandkühler R, Inglin N, Otto TP, Aumann S, Teussink MM, Spaide RF, Scholl HPN, Maloca PM. Time-Resolved Dynamic Optical Coherence Tomography for Retinal Blood Flow Analysis. Invest Ophthalmol Vis Sci 2024; 65:9. [PMID: 38837167 PMCID: PMC11160951 DOI: 10.1167/iovs.65.6.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 05/16/2024] [Indexed: 06/06/2024] Open
Abstract
Purpose Optical coherence tomography (OCT) representations in clinical practice are static and do not allow for a dynamic visualization and quantification of blood flow. This study aims to present a method to analyze retinal blood flow dynamics using time-resolved structural OCT. Methods We developed novel imaging protocols to acquire video-rate time-resolved OCT B-scans (1024 × 496 pixels, 10 degrees field of view) at four different sensor integration times (integration time of 44.8 µs at a nominal A-scan rate of 20 kHz, 22.4 µs at 40 kHz, 11.2 µs at 85 kHz, and 7.24 µs at 125 kHz). The vessel centers were manually annotated for each B-scan and surrounding subvolumes were extracted. We used a velocity model based on signal-to-noise ratio (SNR) drops due to fringe washout to calculate blood flow velocity profiles in vessels within five optic disc diameters of the optic disc rim. Results Time-resolved dynamic structural OCT revealed pulsatile SNR changes in the analyzed vessels and allowed the calculation of potential blood flow velocities at all integration times. Fringe washout was stronger in acquisitions with longer integration times; however, the ratio of the average SNR to the peak SNR inside the vessel was similar across all integration times. Conclusions We demonstrated the feasibility of estimating blood flow profiles based on fringe washout analysis, showing pulsatile dynamics in vessels close to the optic nerve head using structural OCT. Time-resolved dynamic OCT has the potential to uncover valuable blood flow information in clinical settings.
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Affiliation(s)
- Philippe Valmaggia
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Basel, Switzerland
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Philippe C. Cattin
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - Robin Sandkühler
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - Nadja Inglin
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Basel, Switzerland
| | | | - Silke Aumann
- Heidelberg Engineering GmbH, Heidelberg, Germany
| | | | - Richard F. Spaide
- Vitreous Retina Macula Consultants of New York, New York, United States
| | - Hendrik P. N. Scholl
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Basel, Switzerland
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Peter M. Maloca
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Basel, Switzerland
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
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Huang J, Li Y, Liu Y, Shi J, Luo Y, Yang Y, Peng P, Ouyang S, Deng D. Partially coherent Pearcey-Gauss source with hyperbolic sine correlation of the spatial spectrum. OPTICS LETTERS 2024; 49:2857-2860. [PMID: 38824276 DOI: 10.1364/ol.519074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 03/25/2024] [Indexed: 06/03/2024]
Abstract
By designing the intricate coherence structure, we are able to create a desired beam profile and trajectory. Our research focus lies on the Fourier plane, specifically emphasizing the coherence of spatial frequencies, and we find it can be seen as a constant system response. A theoretical framework is developed, and experimental studies are conducted to generate a light field of the spatial spectrum with a complex correlation using the pseudo-mode superposition method. We successfully produce partially coherent Pearcey-Gauss beams whose spatial spectrum is hyperbolic sine correlational. Interestingly, these beams maintain the distinctive propagation properties of the Pearcey pattern while exhibiting the remarkable ability to split the mainlobe into two separate lobes.
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McCarty EB, Bertoni D, Patel T, Jaramillo C, Tobey ABJ, Kumta PN, Chi D, Mady LJ. Degrees of Inflammation in the Treatment of Subglottic Stenosis in a Rabbit Model: Histopathological Assessment of a Novel Bioabsorbable Ultra-high Ductility Magnesium Alloy Stent. Int J Pediatr Otorhinolaryngol 2024; 181:111994. [PMID: 38823367 DOI: 10.1016/j.ijporl.2024.111994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 05/05/2024] [Accepted: 05/26/2024] [Indexed: 06/03/2024]
Abstract
OBJECTIVE Utilizing a novel histopathological scoring system and subglottic stenosis (SGS) rabbit model, we aimed to compare degrees of inflammation and severity of narrowing in the subglottis between two minimally invasive therapeutic modalities: endoscopic balloon dilation (EBD) alone versus EBD with placement of a bioabsorbable ultra-high ductility magnesium (UHD-Mg) alloy stent. METHODS SGS was induced endoscopically via microsuspension laryngoscopy in 23 New Zealand white rabbits. The control group (n = 11) underwent EBD alone, the study arm (n = 12) underwent EBD with implantation of bioabsorbable UHD-Mg alloy stents. Rabbits were euthanized at 2-, 3-, and 6-weeks after SGS induction, coinciding with wound healing stages. Using Optical Coherence Tomography (OCT), cross-sectional areas of airways were compared to calculate the mean percentage of intraluminal area at sequential time points. A novel histopathological scoring system was used to analyze frozen sections of laryngotracheal complexes. The degree of inflammation was quantified by scoring changes in inflammatory cell infiltration, epithelial ulceration/metaplasia, subepithelial edema/fibrosis, and capillary number/dilation. Univariate analysis was utilized to analyze these markers. RESULTS We found rabbits implanted with the bioabsorbable UHD-Mg alloy stent had statistically significantly higher scores in categories of hyperplastic change (stents vs controls: 1.48 vs 0.46 p < 0.001), squamous metaplasia (22 vs 5 p < 0.001), and neutrophils/fibrin in lumen (31 vs 8, p < 0.001). Rabbits who received EBD alone had higher scores of subepithelial edema and fibrosis (2.70 vs 3.49, p < 0.0256). The stented rabbits demonstrated significantly increased mean percent stenosis by intraluminal mean area compared to controls at 2 weeks (88.56 vs 58.98, p = 0.032), however at all other time points there was no significant difference between intraluminal subglottic stenosis by mean percent stenosis area. DISCUSSION Rabbits with SGS treated with UHD-Mg alloy stents demonstrated histopathologic findings suggestive of lower levels of tracheal fibrosis. This could indicate a reduced tendency towards the development of stenosis when compared to EBD alone. There was not a difference in luminal size between stent and non-stented rabbits at the six-week end point. Histologically, however, overall the use of bioabsorbable UHD-Mg alloy stenting elicited a greater tissue response at the level of the superficial mucosa rather than fibrosis of the lamina propria seen in the stented rabbits. This suggests more favorable healing and less of a tendency towards fibrosis and stenosis even though there may not be a benefit from a luminal size standpoint during this early healing period. Compared to known complications of currently available non-bioabsorbable metal or silicone-based stents, this proof-of-concept investigation highlights the potential use of a novel biodegradable UHD-Mg stent as a therapeutic modality for pediatric SGS.
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Affiliation(s)
- E Berryhill McCarty
- Department of Otolaryngology, University of Pittsburgh Medical Center, 203 Lothrop Street, Eye & Ear Institute, Suite 500, Pittsburgh, PA, 15213, USA.
| | - Dylan Bertoni
- Department of Otolaryngology - Head & Neck Surgery, Sidney Kimmel Medical College, 925 Chestnut Street, 6th Floor, Philadelphia, PA, 19107, USA.
| | - Terral Patel
- Department of Otolaryngology, University of Pittsburgh Medical Center, 203 Lothrop Street, Eye & Ear Institute, Suite 500, Pittsburgh, PA, 15213, USA.
| | - Couger Jaramillo
- Department of Pathology & Laboratory Services, Brooke Army Medical Center, 3551 Roger Brooke Dr, Fort Sam, Houston, TX, 78234, USA.
| | - Allison B J Tobey
- Department of Otolaryngology, University of Pittsburgh Medical Center, 203 Lothrop Street, Eye & Ear Institute, Suite 500, Pittsburgh, PA, 15213, USA.
| | - Prashant N Kumta
- Department of Bioengineering, Swanson School of Engineering, 815C Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA; Department of Chemical and Petroleum Engineering, Swanson School of Engineering, 815C Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA; Department of Mechanical Engineering and Materials Science, Swanson School of Engineering, 815C Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA.
| | - David Chi
- Department of Otolaryngology, University of Pittsburgh Medical Center, 203 Lothrop Street, Eye & Ear Institute, Suite 500, Pittsburgh, PA, 15213, USA.
| | - Leila J Mady
- Department of Otolaryngology, University of Pittsburgh Medical Center, 203 Lothrop Street, Eye & Ear Institute, Suite 500, Pittsburgh, PA, 15213, USA.
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42
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Jones GL, Albadawi H, Hariri LP, Bouma BE, Oklu R, Villiger M. Aging of deep venous thrombosis in-vivo using polarization sensitive optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2024; 15:3627-3638. [PMID: 38867781 PMCID: PMC11166430 DOI: 10.1364/boe.522238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 06/14/2024]
Abstract
Deep venous thrombosis (DVT) is a medical condition with significant post-event morbidity and mortality coupled with limited treatment options. Treatment strategy and efficacy are highly dependent on the structural composition of the thrombus, which evolves over time from initial formation and is currently unevaluable with standard clinical testing. Here, we investigate the use of intravascular polarization-sensitive optical coherence tomography (PS-OCT) to assess thrombus morphology and composition in a rat DVT model in-vivo, including changes that occur over the thrombus aging process. PS-OCT measures tissue birefringence, which provides contrast for collagen and smooth muscle cells that are present in older, chronic clots. Thrombi in the inferior vena cava of two cohorts of rats were imaged in-vivo with intravascular PS-OCT at 24 hours (acute, nrats = 3, 73 cross-sections) or 28 days (chronic, nrats = 4, 41 cross-sections) after thrombus formation. Co-registered histology was labelled by an independent pathologist to establish ground-truth clot composition. Automated analysis of OCT cross-sectional images differentiated acute and chronic thrombi with 97.6% sensitivity and 98.6% specificity using a linear discriminant model comprised of both polarization and conventional OCT metrics. These results support PS-OCT as a highly sensitive imaging modality for the assessment of DVT composition to differentiate acute and chronic thrombi. Intravascular PS-OCT imaging could be integrated with advanced catheter-based treatment strategies and serve to guide therapeutic decision-making and deployment, by offering an accurate assessment of DVT patients in real time.
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Affiliation(s)
- Georgia L. Jones
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Hassan Albadawi
- Division of Vascular and Interventional Radiology, Mayo Clinic, Scottsdale, AZ 85259, USA
| | - Lida P. Hariri
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Brett E. Bouma
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Rahmi Oklu
- Division of Vascular and Interventional Radiology, Mayo Clinic, Scottsdale, AZ 85259, USA
| | - Martin Villiger
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
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43
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Lee S, Lee E, Yang H, Park K, Min E, Jung W. Digital histological staining of tissue slide images from optical coherence microscopy. BIOMEDICAL OPTICS EXPRESS 2024; 15:3807-3816. [PMID: 38867770 PMCID: PMC11166446 DOI: 10.1364/boe.520683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 06/14/2024]
Abstract
The convergence of staining-free optical imaging and digital staining technologies has become a central focus in digital pathology, presenting significant advantages in streamlining specimen preparation and expediting the rapid acquisition of histopathological information. Despite the inherent merits of optical coherence microscopy (OCM) as a staining-free technique, its widespread application in observing histopathological slides has been constrained. This study introduces a novel approach by combining wide-field OCM with digital staining technology for the imaging of histopathological slides. Through the optimization of the histology slide production process satisfying the ground growth for digital staining as well as pronounced contrast for OCM imaging, successful imaging of various mouse tissues was achieved. Comparative analyses with conventional staining-based bright field images were executed to evaluate the proposed methodology's efficacy. Moreover, the study investigates the generalization of digital staining color appearance to ensure consistent histopathology, considering tissue-specific and thickness-dependent variations.
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Affiliation(s)
- Sangjin Lee
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Eunji Lee
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Hyunmo Yang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Kibeom Park
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Eunjung Min
- Korea Photonics Technology Institute, Gwangju 61007, Republic of Korea
| | - Woonggyu Jung
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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44
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Iyer RR, Žurauskas M, Rao Y, Chaney EJ, Boppart SA. Bichromatic tetraphasic full-field optical coherence microscopy. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:S22704. [PMID: 38584966 PMCID: PMC10996847 DOI: 10.1117/1.jbo.29.s2.s22704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 02/29/2024] [Accepted: 03/05/2024] [Indexed: 04/09/2024]
Abstract
Significance Full-field optical coherence microscopy (FF-OCM) is a prevalent technique for backscattering and phase imaging with epi-detection. Traditional methods have two limitations: suboptimal utilization of functional information about the sample and complicated optical design with several moving parts for phase contrast. Aim We report an OCM setup capable of generating dynamic intensity, phase, and pseudo-spectroscopic contrast with single-shot full-field video-rate imaging called bichromatic tetraphasic (BiTe) full-field OCM with no moving parts. Approach BiTe OCM resourcefully uses the phase-shifting properties of anti-reflection (AR) coatings outside the rated bandwidths to create four unique phase shifts, which are detected with two emission filters for spectroscopic contrast. Results BiTe OCM overcomes the disadvantages of previous FF-OCM setup techniques by capturing both the intensity and phase profiles without any artifacts or speckle noise for imaging scattering samples in three-dimensional (3D). BiTe OCM also utilizes the raw data effectively to generate three complementary contrasts: intensity, phase, and color. We demonstrate BiTe OCM to observe cellular dynamics, image live, and moving micro-animals in 3D, capture the spectroscopic hemodynamics of scattering tissues along with dynamic intensity and phase profiles, and image the microstructure of fall foliage with two different colors. Conclusions BiTe OCM can maximize the information efficiency of FF-OCM while maintaining overall simplicity in design for quantitative, dynamic, and spectroscopic characterization of biological samples.
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Affiliation(s)
- Rishyashring R. Iyer
- University of Illinois Urbana-Champaign, Beckman Institute for Advanced Science and Technology, Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering, Urbana, Illinois, United States
| | - Mantas Žurauskas
- University of Illinois Urbana-Champaign, Beckman Institute for Advanced Science and Technology, Urbana, Illinois, United States
| | - Yug Rao
- University of Illinois Urbana-Champaign, Beckman Institute for Advanced Science and Technology, Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering, Urbana, Illinois, United States
| | - Eric J. Chaney
- University of Illinois Urbana-Champaign, Beckman Institute for Advanced Science and Technology, Urbana, Illinois, United States
| | - Stephen A. Boppart
- University of Illinois Urbana-Champaign, Beckman Institute for Advanced Science and Technology, Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering, Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Department of Bioengineering, Urbana, Illinois, United States
- University of Illinois Urbana Champaign, NIH/NIBIB P41 Center for Label-free Imaging and Multiscale Biophotonics (CLIMB), Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Cancer Center at Illinois, Urbana, Illinois, United States
- University of Illinois Urbana-Champaign, Carle Illinois College of Medicine, Urbana, Illinois, United States
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45
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Ucakhan OO. Optical Biopsy Using Anterior-Segment Optical Coherence Tomography in Ocular Surface Tumors: The Game Changer. Eye Contact Lens 2024; 50:241-242. [PMID: 38778464 DOI: 10.1097/icl.0000000000001062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Affiliation(s)
- Omur O Ucakhan
- Department of Ophthalmology, Ankara University School of Medicine, Ankara, Turkey
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46
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Amano H, Kojima Y, Hirano S, Oka Y, Aikawa H, Noike R, Yabe T, Okubo R, Ikeda T. The impact of statins treatments for plaque characteristics in stable angina pectoris patients with very low and high low-density lipoprotein cholesterol levels: an intracoronary optical coherence tomography study. Heart Vessels 2024; 39:475-485. [PMID: 38381169 DOI: 10.1007/s00380-024-02359-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 01/10/2024] [Indexed: 02/22/2024]
Abstract
Low-density lipoprotein cholesterol (LDL-C) levels are recommended according to the patient's risk factors based on guidelines. In patients achieving low LDL-C levels, the need for statins is uncertain, and the plaque characteristics of patients not treated with statins are unclear. In addition, the difference in plaque characteristics with and without statins is unclear in similarly high LDL levels. We evaluate the impact of statins on plaque characteristics on optical coherence tomography (OCT) in patients with very low LDL-C levels and high LDL-C levels. A total of 173 stable angina pectoris patients with 173 lesions undergoing OCT before percutaneous coronary intervention were evaluated. We divided the LDL-C levels into three groups: < 70 mg/dL (n = 48), 70 mg/dL ≤ LDL-C < 100 mg/dL (n = 71), and ≥ 100 mg/dL (n = 54). Among patients with LDL-C < 70 mg/dL, patients not treated with statins showed a significantly higher C-reactive protein level (0.27 ± 0.22 mg/dL vs. 0.15 ± 0.19 mg/dL, p = 0.049), and higher incidence of thin-cap fibroatheromas (TCFAs; 44% [7/16] vs. 13% [4/32], p = 0.021) than those treated with statins. Among patients with LDL-C level ≥ 100 mg/dL, patients treated with statins showed a significantly higher prevalence of familial hypercholesterolemia (FH) (38% [6/16] vs. 5% [2/38], p = 0.004), lower incidence of TCFAs (6% [1/16] vs. 39% [15/38], p = 0.013), healed plaques (13% [2/16] vs. 47% [18/38], p = 0.015), and higher incidence of fibrous plaques (75% [12/16] vs. 42% [16/38], p = 0.027) than patients not treated with statins. While patients achieved a low LDL-C, patients not treated with statins had high plaque vulnerability and high systemic inflammation. While patients had a high LDL-C level with a high prevalence of FH, patients treated with statins had stable plaque characteristics.
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Affiliation(s)
- Hideo Amano
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan.
| | - Yoshimasa Kojima
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Shojiro Hirano
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Yosuke Oka
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Hiroto Aikawa
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Ryota Noike
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Takayuki Yabe
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Ryo Okubo
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Takanori Ikeda
- Department of Cardiovascular Medicine, Faculty of Medicine, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo, 143-8541, Japan
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47
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Prairie ML, Gencturk M, McClelland CM, Marka NA, Jiang Z, Folkertsma M, Lee MS. Establishing Optic Nerve Diameter Threshold Sensitive and Specific for Optic Atrophy Diagnosis. Clin Neuroradiol 2024; 34:373-378. [PMID: 38172261 DOI: 10.1007/s00062-023-01369-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 11/21/2023] [Indexed: 01/05/2024]
Abstract
PURPOSE To determine a potential threshold optic nerve diameter (OND) that could reliably differentiate healthy nerves from those affected by optic atrophy (OA) and to determine correlations of OND in OA with retinal nerve fiber layer (RNFL) thickness, visual acuity (VA), and visual field mean deviation (VFMD). METHODS This was a retrospective case control study. Magnetic resonance (MR) images were reviewed from individuals with OA aged 18 years or older with vision loss for more than 6 months and an OA diagnosis established by a neuro-ophthalmologist. Individuals without OA who underwent MR imaging of the orbit for other purposes were also collected. OND was measured on coronal T2-weighted images in the midorbital section, 1cm posterior to the optic disc. Measurements of mean RNFL thickness, VA and VFMD were also collected. RESULTS In this study 47 OA subjects (63% women, 78 eyes) and 75 normal subjects (42.7% women, 127 eyes) were assessed. Healthy ONDs (mean 2.73 ± 0.24 mm) were significantly greater than OA nerve diameters (mean 1.94 ± 0.32 mm; P < 0.001). A threshold OND of ≤2.3 mm had a sensitivity of 0.92 and a specificity of 0.93 in predicting OA. Mean RNFL (r = 0.05, p = 0.68), VA (r = 0.17, p = 0.14), and VFMD (r = 0.18, p = 0.16) were not significantly associated with OND. CONCLUSION ONDs are significantly reduced in patients with OA compared with healthy nerves. A threshold OND of ≤2.3 mm is highly sensitive and specific for a diagnosis of OA. OND was not significantly correlated with RNFL thickness, VA, or VFMD.
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Affiliation(s)
- Michael L Prairie
- Departments of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
| | - Mehmet Gencturk
- Department of Neuroradiology, University of Minnesota, Minneapolis, MN, USA
| | - Collin M McClelland
- Departments of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
| | - Nicholas A Marka
- Department of Clinical and Translational Science Institute, University of Minnesota, Minneapolis, MN, USA
| | - Ziou Jiang
- Department of Clinical and Translational Science Institute, University of Minnesota, Minneapolis, MN, USA
| | - Mark Folkertsma
- Department of Neuroradiology, University of Minnesota, Minneapolis, MN, USA
| | - Michael S Lee
- Departments of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA.
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48
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Román-Valenzuela T, Rodríguez-Fajardo V, Bo-Hu X, Rosales-Guzmán C. Generation of cylindrical vector modes via astigmatic mode conversion. OPTICS LETTERS 2024; 49:2910-2913. [PMID: 38824290 DOI: 10.1364/ol.519781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 04/25/2024] [Indexed: 06/03/2024]
Abstract
In this work, we propose and demonstrate experimentally a compact technique for generating cylindrical vector beams based on a Michelson interferometer and a π-astigmatic mode converter. The latter is required to invert the topological charge of higher-order Laguerre-Gauss (LG) beams. Our proposed technique generalizes the use of astigmatic mode conversion, commonly associated only with scalar beams, to vector beams with a non-homogeneous polarization distribution. We anticipate that many applications based on Michelson interferometers will benefit from the unique properties of vector beams.
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49
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Yan Q, Ma Y, Wu W, Mou L, Huang W, Cheng J, Zhao Y. Choroidal Layer Analysis in OCT images via Ambiguous Boundary-aware Attention. Comput Biol Med 2024; 175:108386. [PMID: 38691915 DOI: 10.1016/j.compbiomed.2024.108386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 02/15/2024] [Accepted: 03/24/2024] [Indexed: 05/03/2024]
Abstract
Optical Coherence Tomography (OCT) is a commonly used retina imaging technique, and it is capable of revealing the morphology of the choroid. However, the segmentation and quantitative analysis of the sublayers and vessels in choroid are rarely explored, primarily due to the indistinct boundaries of choroidal sublayers, and imbalanced distribution of vessels observed in OCT imagery. In this paper, we propose a novel two-stage architecture called Choroidal Layer Analysis network (CLA), that may be considered the first attempt in this research community for joint segmentation of choroidal sublayers and choroidal vessels in OCT images. CLA employs the encoder-decoder network with the residual U-shape module as the backbone. In order to empower the ability of the segmentation model to identify the inconspicuous boundaries of choroidal sublayers, we introduce an Ambiguous Boundary Attention block (ABA) into the bottleneck of the encoder-decoder network in the first stage. For more accurate segmentation of large choroidal vessels with ambiguous contours and imbalanced spatial distribution, the second stage introduces an active contour-based loss to refine the contours of choroidal vessels simultaneously with precise identification of each vessel via contextual modeling. To train, test and validate the proposed model, we conducted a choroidal segmentation dataset containing 800 OCT images, with their sublayers and large choroidal vessels manually annotated. Experimental results demonstrate the superiority of the proposed approach compared with other state-of-the-art segmentation networks in large margins. It is worth noting that we also reconstructed the large choroidal vessels in three-dimensional (3D) based on the segmentation results, and multiple 3D morphological parameters were calculated. The statistical analysis of these parameters demonstrates significant differences between the healthy control and high myopia group, and this further confirms the proposed work may facilitate subsequent disease understanding and clinical decision-making.
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Affiliation(s)
- Qifeng Yan
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
| | - Yuhui Ma
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China.
| | - Wenjun Wu
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
| | - Lei Mou
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
| | - Wei Huang
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
| | - Jun Cheng
- Institute for Infocomm Research, A*STAR, Singapore
| | - Yitian Zhao
- Laboratory of Advanced Theranostic Materials and Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China.
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50
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Lu X, Zhou C, Delima RS, Lees EW, Soni A, Dvorak DJ, Ren S, Ji T, Bahi A, Ko F, Berlinguette CP. Visualization of CO 2 electrolysis using optical coherence tomography. Nat Chem 2024; 16:979-987. [PMID: 38429344 DOI: 10.1038/s41557-024-01465-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 01/29/2024] [Indexed: 03/03/2024]
Abstract
Electrolysers offer an appealing technology for conversion of CO2 into high-value chemicals. However, there are few tools available to track the reactions that occur within electrolysers. Here we report an electrolysis optical coherence tomography platform to visualize the chemical reactions occurring in a CO2 electrolyser. This platform was designed to capture three-dimensional images and videos at high spatial and temporal resolutions. We recorded 12 h of footage of an electrolyser containing a porous electrode separated by a membrane, converting a continuous feed of liquid KHCO3 to reduce CO2 into CO at applied current densities of 50-800 mA cm-2. This platform visualized reactants, intermediates and products, and captured the strikingly dynamic movement of the cathode and membrane components during electrolysis. It also linked CO production to regions of the electrolyser in which CO2 was in direct contact with both membrane and catalyst layers. These results highlight how this platform can be used to track reactions in continuous flow electrochemical reactors.
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Affiliation(s)
- Xin Lu
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Chris Zhou
- Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, British Columbia, Canada
- Department of Materials Engineering, The University of British Columbia, Vancouver, British Columbia, Canada
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Roxanna S Delima
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada
- Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Eric W Lees
- Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Abhishek Soni
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - David J Dvorak
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Shaoxuan Ren
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Tengxiao Ji
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Addie Bahi
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Frank Ko
- Department of Materials Engineering, The University of British Columbia, Vancouver, British Columbia, Canada
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Curtis P Berlinguette
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada.
- Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, British Columbia, Canada.
- Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, British Columbia, Canada.
- Canadian Institute for Advanced Research, Toronto, Ontario, Canada.
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