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Geng X, Liang X, Liu Y, Chen Y, Xue B, Wei X, Yuan Z. Natural Fat Nanoemulsions for Enhanced Optical Coherence Tomography Neuroimaging and Tumor Imaging in the Second Near-Infrared Window. ACS NANO 2024; 18:9187-9198. [PMID: 38466960 DOI: 10.1021/acsnano.4c01204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
Optical coherence tomography (OCT) imaging mainly uses backscattered light to visualize the structural and functional information on biological tissues. In particular, OCT angiography can not only map the capillary networks but also capture the blood flow in the tissue microenvironment, making it a good candidate for neuroimaging and tumor imaging in vivo and in real time. To further improve the detection accuracy of cancer or brain disorders, it is essential to develop a natural and nontoxic contrast agent for enhanced OCT imaging in the second near-infrared (NIR-II) window. In this study, a superior biocompatible and highly scattering NIR-II fat nanoemulsion was constructed to improve OCT imaging contrast and depth for monitoring the vascular network changes of the cerebral cortex or tumor. In vivo experimental results demonstrated that a natural fat nanoemulsion can serve as an excellent probe for enhanced OCT neuroimaging and tumor imaging.
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Affiliation(s)
- Xiaorui Geng
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
| | - Xiao Liang
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Yubin Liu
- College of Photonics and Electric Engineering, Fuzhou Normal University, Fuzhou, 350117, China
| | - Yuhao Chen
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
| | - Bin Xue
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen, 518118, China
| | - Xianyuan Wei
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
| | - Zhen Yuan
- Cancer Center, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, China
- Centre for Cognitive and Brain Sciences, University of Macau, Taipa, Macau SAR 999078, China
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Yao J, Muñoz-Ortiz T, Sanz-Rodríguez F, Martín Rodríguez E, Ortgies DH, García Solé J, Jaque D, Marin R. Bismuth Selenide Nanostructured Clusters as Optical Coherence Tomography Contrast Agents: Beyond Gold-Based Particles. ACS PHOTONICS 2022; 9:559-566. [PMID: 35224134 PMCID: PMC8862561 DOI: 10.1021/acsphotonics.1c01504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Indexed: 06/14/2023]
Abstract
Optical coherence tomography (OCT) is an imaging technique currently used in clinical practice to obtain optical biopsies of different biological tissues in a minimally invasive way. Among the contrast agents proposed to increase the efficacy of this imaging method, gold nanoshells (GNSs) are the best performing ones. However, their preparation is generally time-consuming, and they are intrinsically costly to produce. Herein, we propose a more affordable alternative to these contrast agents: Bi2Se3 nanostructured clusters with a desert rose-like morphology prepared via a microwave-assisted method. The structures are prepared in a matter of minutes, feature strong near-infrared extinction properties, and are biocompatible. They also boast a photon-to-heat conversion efficiency of close to 50%, making them good candidates as photothermal therapy agents. In vitro studies evidence the prowess of Bi2Se3 clusters as OCT contrast agents and prove that their performance is comparable to that of GNSs.
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Affiliation(s)
- Jingke Yao
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
| | - Tamara Muñoz-Ortiz
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
| | - Francisco Sanz-Rodríguez
- Nanomaterials
for Bioimaging Group (nanoBIG), Instituto Ramón y Cajal de
Investigación Sanitaria, Hospital
Ramón y Cajal, Ctra. De Colmenar Viejo, Km. 9,100, Madrid 28034, Spain
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Biología, Facultad
de Biología, Universidad Autónoma
de Madrid, C/ Darwin
2, Madrid 28049, Spain
| | - Emma Martín Rodríguez
- Nanomaterials
for Bioimaging Group (nanoBIG), Instituto Ramón y Cajal de
Investigación Sanitaria, Hospital
Ramón y Cajal, Ctra. De Colmenar Viejo, Km. 9,100, Madrid 28034, Spain
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física Aplicada,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco
Tomás y Valiente 7, Madrid 28049, Spain
| | - Dirk H. Ortgies
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
- Nanomaterials
for Bioimaging Group (nanoBIG), Instituto Ramón y Cajal de
Investigación Sanitaria, Hospital
Ramón y Cajal, Ctra. De Colmenar Viejo, Km. 9,100, Madrid 28034, Spain
| | - José García Solé
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
- Nanomaterials
for Bioimaging Group (nanoBIG), Instituto Ramón y Cajal de
Investigación Sanitaria, Hospital
Ramón y Cajal, Ctra. De Colmenar Viejo, Km. 9,100, Madrid 28034, Spain
| | - Daniel Jaque
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
- Nanomaterials
for Bioimaging Group (nanoBIG), Instituto Ramón y Cajal de
Investigación Sanitaria, Hospital
Ramón y Cajal, Ctra. De Colmenar Viejo, Km. 9,100, Madrid 28034, Spain
| | - Riccardo Marin
- Nanomaterials
for Bioimaging Group (nanoBIG), Departamento de Física de Materiales,
Facultad de Ciencias, Universidad Autónoma
de Madrid, C/ Francisco Tomás y Valiente 7, Madrid 28049, Spain
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Hohmann M, Hecht D, Lengenfelder B, Späth M, Klämpfl F, Schmidt M. Proof of Principle for Direct Reconstruction of Qualitative Depth Information from Turbid Media by a Single Hyper Spectral Image. SENSORS 2021; 21:s21082860. [PMID: 33921629 PMCID: PMC8073672 DOI: 10.3390/s21082860] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/12/2021] [Accepted: 04/14/2021] [Indexed: 01/14/2023]
Abstract
In medical applications, hyper-spectral imaging is becoming more and more common. It has been shown to be more effective for classification and segmentation than normal RGB imaging because narrower wavelength bands are used, providing a higher contrast. However, until now, the fact that hyper-spectral images also contain information about the three-dimensional structure of turbid media has been neglected. In this study, it is shown that it is possible to derive information about the depth of inclusions in turbid phantoms from a single hyper-spectral image. Here, the depth information is encoded by a combination of scattering and absorption within the phantom. Although scatter-dominated regions increase the backscattering for deep vessels, absorption has the opposite effect. With this argumentation, it makes sense to assume that, under certain conditions, a wavelength is not influenced by the depth of the inclusion and acts as an iso-point. This iso-point could be used to easily derive information about the depth of an inclusion. In this study, it is shown that the iso-point exists in some cases. Moreover, it is shown that the iso-point can be used to obtain precise depth information.
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Affiliation(s)
- Martin Hohmann
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordon-Strasse 6, 91052 Erlangen, Germany
- Correspondence:
| | - Damaris Hecht
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
| | - Benjamin Lengenfelder
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordon-Strasse 6, 91052 Erlangen, Germany
| | - Moritz Späth
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordon-Strasse 6, 91052 Erlangen, Germany
| | - Florian Klämpfl
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordon-Strasse 6, 91052 Erlangen, Germany
| | - Michael Schmidt
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Strasse 3/5, 91052 Erlangen, Germany; (D.H.); (B.L.); (M.S.); (F.K.); (M.S.)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordon-Strasse 6, 91052 Erlangen, Germany
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Wang T, Pfeiffer T, Daemen J, Mastik F, Wieser W, van der Steen AFW, Huber R, van Soest G. Simultaneous Morphological and Flow Imaging Enabled by Megahertz Intravascular Doppler Optical Coherence Tomography. IEEE TRANSACTIONS ON MEDICAL IMAGING 2020; 39:1535-1544. [PMID: 31725370 DOI: 10.1109/tmi.2019.2948258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We demonstrate three-dimensional intravascular flow imaging compatible with routine clinical image acquisition workflow by means of megahertz (MHz) intravascular Doppler Optical Coherence Tomography (OCT). The OCT system relies on a 1.1 mm diameter motorized imaging catheter and a 1.5 MHz Fourier Domain Mode Locked (FDML) laser. Using a post processing method to compensate the drift of the FDML laser output, we can resolve the Doppler phase shift between two adjoining OCT A-line datasets. By interpretation of the velocity field as measured around the zero phase shift, the flow direction at specific angles can be qualitatively estimated. Imaging experiments were carried out in phantoms, micro channels, and swine coronary artery in vitro at a speed of 600 frames/s. The MHz wavelength sweep rate of the OCT system allows us to directly investigate flow velocity of up to 37.5 cm/s while computationally expensive phase-unwrapping has to be applied to measure such high speed using conventional OCT system. The MHz sweep rate also enables a volumetric Doppler imaging even with a fast pullback at 40 mm/s. We present the first simultaneously recorded 3D morphological images and Doppler flow profiles. Flow pattern estimation and three-dimensional structural reconstruction of entire coronary artery are achieved using a single OCT pullback dataset.
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Sun IC, Emelianov S. Gas-generating nanoparticles for contrast-enhanced ultrasound imaging. NANOSCALE 2019; 11:16235-16240. [PMID: 31453614 PMCID: PMC6759366 DOI: 10.1039/c9nr04471j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We present gas-generating solid nanoparticles as a new concept of an ultrasound contrast agent. The developed nanoparticles are sufficiently small (less than 100 nm in diameter) to escape vasculature and yet, upon external pulsed laser light activation, release nitrogen gas for enhanced contrast in ultrasound imaging. The gas-generating nanoconstructs combine the photocatalytic function of gold nanoparticles and photolysis of azide compounds. Using ultrasound imaging, we demonstrate the controlled, on-demand generation of nitrogen gas from nanoparticles due to the decomposition of azide groups triggered by pulsed laser irradiation. The resulting gas forms bubbles that cause backscattered ultrasound signals and, therefore, modulate the contrast in ultrasound imaging.
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Affiliation(s)
- In-Cheol Sun
- School of Electrical and Computer Engineering and Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, 777 Atlantic Drive, Atlanta, GA 30332, USA.
| | - Stanislav Emelianov
- School of Electrical and Computer Engineering and Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, 777 Atlantic Drive, Atlanta, GA 30332, USA.
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Demidov V, Matveev LA, Demidova O, Matveyev AL, Zaitsev VY, Flueraru C, Vitkin IA. Analysis of low-scattering regions in optical coherence tomography: applications to neurography and lymphangiography. BIOMEDICAL OPTICS EXPRESS 2019; 10:4207-4219. [PMID: 31453005 PMCID: PMC6701530 DOI: 10.1364/boe.10.004207] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/24/2019] [Accepted: 07/17/2019] [Indexed: 05/19/2023]
Abstract
Analysis of semi-transparent low scattering biological structures in optical coherence tomography (OCT) has been actively pursued in the context of lymphatic imaging, with most approaches relying on the relative absence of signal as a means of detection. Here we present an alternate methodology based on spatial speckle statistics, utilizing the similarity of a distribution of given voxel intensities to the power distribution function of pure noise, to visualize the low-scattering biological structures of interest. In a human tumor xenograft murine model, we show that these correspond to lymphatic vessels and nerves; extensive histopathologic validation studies are reported to unequivocally establish this correspondence. The emerging possibility of OCT lymphangiography and neurography is novel and potentially impactful (especially the latter), although further methodology refinement is needed to distinguish between the visualized lymphatics and nerves.
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Affiliation(s)
- Valentin Demidov
- Department of Medical Biophysics, University of Toronto, 101 College St., Toronto, M5G 1L7, Canada
| | - Lev A. Matveev
- Institute of Applied Physics Russian Academy of Sciences, 46 Ulyanov Street, Nizhniy Novgorod, 603950, Russia
| | - Olga Demidova
- Department of Arts and Science, Seneca College, 1750 Finch Avenue East, Toronto, M2J 2X5, Canada
| | - Alexander L. Matveyev
- Institute of Applied Physics Russian Academy of Sciences, 46 Ulyanov Street, Nizhniy Novgorod, 603950, Russia
| | - Vladimir Y. Zaitsev
- Institute of Applied Physics Russian Academy of Sciences, 46 Ulyanov Street, Nizhniy Novgorod, 603950, Russia
| | - Costel Flueraru
- National Research Council Canada, Information Communication Technology, 1200 Montreal Rd, Ottawa, K1A0R6, Canada
| | - I. Alex Vitkin
- Department of Medical Biophysics, University of Toronto, 101 College St., Toronto, M5G 1L7, Canada
- University Health Network, Princess Margaret Cancer Centre, 610 University Ave, Toronto, M5G 2C1, Canada
- University of Toronto, Department of Radiation Oncology, 150 College St, Toronto, M5S 3E2, Canada
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Demidov V, Zhao X, Demidova O, Pang HYM, Flueraru C, Liu FF, Vitkin IA. Preclinical quantitative in-vivo assessment of skin tissue vascularity in radiation-induced fibrosis with optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-9. [PMID: 30315644 DOI: 10.1117/1.jbo.23.10.106003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 09/19/2018] [Indexed: 05/16/2023]
Abstract
Radiation therapy (RT) is widely and effectively used for cancer treatment but can also cause deleterious side effects, such as a late-toxicity complication called radiation-induced fibrosis (RIF). Accurate diagnosis of RIF requires analysis of histological sections to assess extracellular matrix infiltration. This is invasive, prone to sampling limitations, and thus rarely used; instead, current practice relies on subjective clinical surrogates, including visual observation, palpation, and patient symptomatology questionnaires. This preclinical study demonstrates that functional optical coherence tomography (OCT) is a useful tool for objective noninvasive in-vivo assessment and quantification of fibrosis-associated microvascular changes in tissue. Data were collected from murine hind limbs 6 months after 40-Gy single-dose irradiation and compared with nonirradiated contralateral tissues of the same animals. OCT-derived vascular density and average vessel diameter metrics were compared to quantitative vascular analysis of stained histological slides. Results indicate that RIF manifests significant microvascular changes at this time point posttreatment. Abnormal microvascular changes visualized by OCT in this preclinical setting suggest the potential of this label-free high-resolution noninvasive functional imaging methodology for RIF diagnosis and assessment in the context of clinical RT.
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Affiliation(s)
- Valentin Demidov
- University of Toronto, Department of Medical Biophysics, Faculty of Medicine, Toronto, Canada
| | - Xiao Zhao
- University of Toronto, Department of Otolaryngology - Head and Neck Surgery, Faculty of Medicine, To, Canada
| | - Olga Demidova
- Seneca College, Department of Arts and Science, Toronto, Canada
| | - Hilary Y M Pang
- University of Toronto, Department of Medical Biophysics, Faculty of Medicine, Toronto, Canada
| | - Costel Flueraru
- National Research Council Canada, Information Communication Technology, Ottawa, Canada
| | - Fei-Fei Liu
- University of Toronto, Department of Medical Biophysics, Faculty of Medicine, Toronto, Canada
- University of Toronto, Department of Otolaryngology - Head and Neck Surgery, Faculty of Medicine, To, Canada
- University Health Network, Princess Margaret Cancer Centre, Toronto, Canada
| | - I Alex Vitkin
- University of Toronto, Department of Medical Biophysics, Faculty of Medicine, Toronto, Canada
- University Health Network, Princess Margaret Cancer Centre, Toronto, Canada
- University of Toronto, Department of Radiation Oncology, Faculty of Medicine, Toronto, Canada
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Oka N, Kadohira T, Fujii K, Kitahara H, Fujimoto Y, Kobayashi Y. Microbubble contrast enhancement of neointima after drug-eluting stent implantation: an optical coherence tomography study. Heart Vessels 2018; 34:393-400. [PMID: 30187118 DOI: 10.1007/s00380-018-1255-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 08/31/2018] [Indexed: 11/26/2022]
Abstract
Microvessels within neoatherosclerosis are associated with vulnerability and increase from the early to the very late phase after drug-eluting stent implantation. Microbubble contrast agents have been suggested to enhance tissue microvasculature for optical coherence tomography (OCT) imaging. The present study investigated whether OCT signal intensity of neointima within stented segments was enhanced after intracoronary administration of microbubble contrast agents. A total of 40 patients who underwent follow-up coronary angiography after drug-eluting stent implantation were enrolled. At the time of follow-up coronary angiography, OCT images of the stented segments were recorded before and after intracoronary administration of microbubble contrast agents. Mean OCT signal intensity of neointima after microbubble administration significantly increased [95.5 (85.7, 106.2) vs. 96.5 (88.7, 109.9), p = 0.001]. Multivariate analysis demonstrated the relationship between diabetes and greater neointima enhancement. The change in the OCT signal intensity of neointima following microbubble administration tended to be higher in diabetic patients than in non-diabetic patients [4.6 (0.6, 8.5) vs. 1.4 (- 1.1, 3.0), p = 0.05]. These findings suggest that this methodology may allow identification of neovascularization in neointima and evaluation of vulnerability of neoatherosclerosis. Microvessels in neointima may be a future target of pharmacological and interventional innovations for preventing stent failure.
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Affiliation(s)
- Norikiyo Oka
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan.
| | - Tadayuki Kadohira
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Kenichi Fujii
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Hideki Kitahara
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Yoshihide Fujimoto
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Yoshio Kobayashi
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
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Zhu J, Merkle CW, Bernucci MT, Chong SP, Srinivasan VJ. Can OCT Angiography Be Made a Quantitative Blood Measurement Tool? APPLIED SCIENCES-BASEL 2017; 7. [PMID: 30009045 PMCID: PMC6042878 DOI: 10.3390/app7070687] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Optical Coherence Tomography Angiography (OCTA) refers to a powerful class of OCT scanning protocols and algorithms that selectively enhance the imaging of blood vessel lumens, based mainly on the motion and scattering of red blood cells (RBCs). Though OCTA is widely used in clinical and basic science applications for visualization of perfused blood vessels, OCTA is still primarily a qualitative tool. However, more quantitative hemodynamic information would better delineate disease mechanisms, and potentially improve the sensitivity for detecting early stages of disease. Here, we take a broader view of OCTA in the context of microvascular hemodynamics and light scattering. Paying particular attention to the unique challenges presented by capillaries versus larger supplying and draining vessels, we critically assess opportunities and challenges in making OCTA a quantitative tool.
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Affiliation(s)
- Jun Zhu
- Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, USA
| | - Conrad W. Merkle
- Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, USA
| | - Marcel T. Bernucci
- Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, USA
| | - Shau Poh Chong
- Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, USA
| | - Vivek J. Srinivasan
- Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, USA
- Department of Ophthalmology and Vision Science, School of Medicine, University of California Davis, Sacramento, CA 95817, USA
- Correspondence: ; Tel.: +1-530-752-9277
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Tsai MT, Zhang JW, Liu YH, Yeh CK, Wei KC, Liu HL. Acoustic-actuated optical coherence angiography. OPTICS LETTERS 2016; 41:5813-5816. [PMID: 27973509 DOI: 10.1364/ol.41.005813] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Optical coherence tomography (OCT) angiography requires high sensitivity and image penetration for detailed microvascular monitoring. Unfortunately, no effective contrast-medium-enhanced scheme is currently available for imaging improvement. We here propose the simultaneous use of gas-filled microbubbles (MBs) and acoustic actuation to enhance the imaging contrast of OCT angiography. OCT-synchronized acoustic actuation was applied in the presence of MBs, and different moving object tracking angiographic algorithms were tested in in vitro tubing and in vivo mouse experiments. This scheme significantly enhanced the OCT angiography performance, including its sensitivity and penetration, and should advance the utilization of OCT as an effective microvascular diagnostic tool.
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