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Kuznetsov D, Dezhurov S, Krylsky D, Novikov V, Neschisliaev V, Kuznetsova A. Use of folic acid nanosensors with excellent photostability for hybrid imaging. J Zhejiang Univ Sci B 2022; 23:784-790. [PMID: 36111575 DOI: 10.1631/jzus.b2200107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Sentinel lymph node (SLN) mapping and tumor-boundary delineation play a key role in cancer surgery, as they have great potential to reduce surgical intervention and increase relapse-free survival rates of patients. The autofluorescence imaging (AFI) method can improve the efficiency of tumor delineation and optimize the scope of surgical intervention, but there are still no fluorescent drugs that can be used with such a method to form a hybrid imaging technique. Another problem is bleaching when fluorescent dyes are conjugated with folic acid. This study reports, for the first time, nanosensors with excellent photostability and compatibility with endoscopes for AFI, which makes simultaneous hybrid imaging possible. After functionalization of the quantum dot (QD) surfaces, we found that they bound effectively to MCF-7 cancer cells. The diagnostic value of simultaneous hybrid imaging using common AFI equipment in delineating tumor boundaries and mapping SLN can reduce the cost of diagnosis and increase its reliability.
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Affiliation(s)
- Denis Kuznetsov
- G N. Gabrichevsky Scientific and Research Institute of Epidemiology and Microbiology, Moscow 125212, Russia. .,Perm State Pharmaceutical Academy, Perm 614990, Russia.
| | - Sergey Dezhurov
- Research Institute of Applied Acoustics, Center of High Technologies, Dubna 141980, Russia
| | - Dmitri Krylsky
- Research Institute of Applied Acoustics, Center of High Technologies, Dubna 141980, Russia
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Marsden M, Weaver SS, Marcu L, Campbell MJ. Intraoperative Mapping of Parathyroid Glands Using Fluorescence Lifetime Imaging. J Surg Res 2021; 265:42-48. [PMID: 33878575 DOI: 10.1016/j.jss.2021.03.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 01/29/2021] [Accepted: 03/03/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND Hypoparathyroidism is a common complication following thyroidectomy. There is a need for technology to aid surgeons in identifying the parathyroid glands. In contrast to near infrared technologies, fluorescence lifetime imaging (FLIm) is not affected by ambient light and may be valuable in identifying parathyroid tissue, but has never been evaluated in this capacity. METHODS We used FLIm to measure the UV induced (355 nm) time-resolved autofluorescence signatures (average lifetimes in 3 spectral emission channels) of thyroid, parathyroid, lymphoid and adipose tissue in 21 patients undergoing thyroid and parathyroid surgery. The Mann-Whitney U test was used to assess the ability of FLIm to discriminate normocellular parathyroid from each of the other tissues. Various machine learning classifiers (random forests, neural network, support vector machine) were then evaluated to recognize parathyroid through a leave-one-out cross-validation. RESULTS Statistically significant differences in average lifetime were observed between parathyroid and each of the other tissue types in spectral channels 2 and 3 respectively. The largest change was observed between adipose tissue and parathyroid (P < 0.001), while less pronounced but still significant changes were observed when comparing parathyroid with lymphoid tissue (P < 0.05) and thyroid (P < 0.01). A random forest classifier trained on average lifetimes was found to detect parathyroid tissue with 100% sensitivity and 93% specificity at the acquisition run level. CONCLUSION We found that FLIm derived parameters can distinguish the parathyroid glands and other adjacent tissue types and has promise in scanning the surgical field to identify parathyroid tissue in real-time.
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Affiliation(s)
- Mark Marsden
- University of California, Davis Department of Biomedical Engineering, Sacramento, California
| | | | - Laura Marcu
- University of California, Davis Department of Biomedical Engineering, Sacramento, California
| | - Michael J Campbell
- University of California, Davis Department of Surgery, Sacramento, California.
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Kozan N, Savka I, Kryvetskyi V, Oliynyk I. Laser-Induced Spectral-Selective Autofluorescent Microscopy as a Prospective Method of Research in Biomedicine. GALICIAN MEDICAL JOURNAL 2020. [DOI: 10.21802/gmj.2020.4.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In modern medical diagnostics, optical methods of studying living tissues have become widespread and are collectively called "optical biopsy". One such method is autofluorescence microscopy, which provides additional information about the structural and functional features of the sample. In this paper, an analysis of existing data was performed on the properties of autofluorescence of cells and tissues to evaluate the available instrumental systems and methods for monitoring autofluorescence and the potential for its application in the biomedical field.
Over the past few years, advanced optical-electronic methods have become available to detect various pathological conditions of tissues and environments of the human body by evaluating signals emitted by endogenous fluorophores. Because these molecules are often involved in basic biological processes, they are important parameters for checking the condition of cells and tissues. In our opinion, analytical methods based on autofluorescence monitoring have great potential in both research and diagnosis, and interest in the use of these new analytical tools is constantly growing. Methods based on autofluorescence can give more information about the object under study with relatively lower costs and less diagnostic error.
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Asfour H, Otridge J, Thomasian R, Larson C, Sarvazyan N. Autofluorescence properties of balloon polymers used in medical applications. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:JBO-200216R. [PMID: 33084257 PMCID: PMC7575097 DOI: 10.1117/1.jbo.25.10.106004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
SIGNIFICANCE For use in medical balloons and related clinical applications, polymers are usually designed for transparency under illumination with white-light sources. However, when illuminated with ultraviolet (UV) or blue light, most of these materials autofluoresce in the visible range, which can be a concern for modalities that rely on tissue autofluorescence for diagnostic or therapeutic purposes. AIM A search for published information on spectral properties of polymers that can be used for medical balloon manufacturing revealed a scarcity of published information on this subject. The aim of these studies was to address this gap. APPROACH The autofluorescence properties of polymers used in medical balloon manufacturing were examined for their suitability for hyperspectral imaging and related applications. Excitation-emission matrices of different balloon materials were acquired within the 320- to 620-nm spectral range. In parallel, autofluorescence profiles from the 420- to 620-nm range were extracted from hyperspectral datasets of the same samples illuminated with UV light. The list of tested polymers included polyurethanes, nylon, polyethylene terephthalate (PET), polyether block amide (PEBAX), vulcanized silicone, thermoplastic elastomers with and without talc, and cyclic olefin copolymers, known by their trade name TOPAS. RESULTS Each type of polymer exhibited a specific pattern of autofluorescence. Polyurethanes, PET, and thermoplastic elastomers containing talc had the highest autofluorescence values, while sheets made of nylon, PEBAX, and TOPAS exhibited negligible autofluorescence. Hyperspectral imaging was used to illustrate how the choice of specific balloon material can impact the ability of principal component analysis to reveal the ablated cardiac tissue. CONCLUSIONS The data revealed significant differences between autofluorescence profiles of the polymers and pointed to the most promising balloon materials for clinical implementation of approaches that depend on tissue autofluorescence.
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Affiliation(s)
- Huda Asfour
- The George Washington University, Department of Pharmacology and Physiology, Washington, DC, United States
| | - Jeremy Otridge
- The George Washington University, Department of Pharmacology and Physiology, Washington, DC, United States
| | - Robert Thomasian
- The George Washington University, Department of Pharmacology and Physiology, Washington, DC, United States
| | - Cinnamon Larson
- Nocturnal Product Development, LLC, Durham, North Carolina, United States
| | - Narine Sarvazyan
- The George Washington University, Department of Pharmacology and Physiology, Washington, DC, United States
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Ortega S, Halicek M, Fabelo H, Callico GM, Fei B. Hyperspectral and multispectral imaging in digital and computational pathology: a systematic review [Invited]. BIOMEDICAL OPTICS EXPRESS 2020; 11:3195-3233. [PMID: 32637250 PMCID: PMC7315999 DOI: 10.1364/boe.386338] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 03/28/2020] [Accepted: 05/08/2020] [Indexed: 05/06/2023]
Abstract
Hyperspectral imaging (HSI) and multispectral imaging (MSI) technologies have the potential to transform the fields of digital and computational pathology. Traditional digitized histopathological slides are imaged with RGB imaging. Utilizing HSI/MSI, spectral information across wavelengths within and beyond the visual range can complement spatial information for the creation of computer-aided diagnostic tools for both stained and unstained histological specimens. In this systematic review, we summarize the methods and uses of HSI/MSI for staining and color correction, immunohistochemistry, autofluorescence, and histopathological diagnostic research. Studies include hematology, breast cancer, head and neck cancer, skin cancer, and diseases of central nervous, gastrointestinal, and genitourinary systems. The use of HSI/MSI suggest an improvement in the detection of diseases and clinical practice compared with traditional RGB analysis, and brings new opportunities in histological analysis of samples, such as digital staining or alleviating the inter-laboratory variability of digitized samples. Nevertheless, the number of studies in this field is currently limited, and more research is needed to confirm the advantages of this technology compared to conventional imagery.
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Affiliation(s)
- Samuel Ortega
- Department of Bioengineering, University of Texas at Dallas, Richardson, TX 75080, USA
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), Campus de Tafira, 35017, Las Palmas de Gran Canaria, Las Palmas, Spain
- These authors contributed equally to this work
| | - Martin Halicek
- Department of Bioengineering, University of Texas at Dallas, Richardson, TX 75080, USA
- Department of Biomedical Engineering, Georgia Inst. of Tech. and Emory University, Atlanta, GA 30322, USA
- These authors contributed equally to this work
| | - Himar Fabelo
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), Campus de Tafira, 35017, Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Gustavo M Callico
- Institute for Applied Microelectronics (IUMA), University of Las Palmas de Gran Canaria (ULPGC), Campus de Tafira, 35017, Las Palmas de Gran Canaria, Las Palmas, Spain
| | - Baowei Fei
- Department of Bioengineering, University of Texas at Dallas, Richardson, TX 75080, USA
- University of Texas Southwestern Medical Center, Advanced Imaging Research Center, Dallas, TX 75235, USA
- University of Texas Southwestern Medical Center, Department of Radiology, Dallas, TX 75235, USA
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Leavesley SJ, Walters M, Lopez C, Baker T, Favreau PF, Rich TC, Rider PF, Boudreaux CW. Hyperspectral imaging fluorescence excitation scanning for colon cancer detection. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:104003. [PMID: 27792808 PMCID: PMC5084534 DOI: 10.1117/1.jbo.21.10.104003] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 10/04/2016] [Indexed: 05/06/2023]
Abstract
Optical spectroscopy and hyperspectral imaging have shown the potential to discriminate between cancerous and noncancerous tissue with high sensitivity and specificity. However, to date, these techniques have not been effectively translated to real-time endoscope platforms. Hyperspectral imaging of the fluorescence excitation spectrum represents new technology that may be well suited for endoscopic implementation. However, the feasibility of detecting differences between normal and cancerous mucosa using fluorescence excitation-scanning hyperspectral imaging has not been evaluated. The goal of this study was to evaluate the initial feasibility of using fluorescence excitation-scanning hyperspectral imaging for measuring changes in fluorescence excitation spectrum concurrent with colonic adenocarcinoma using a small pre-pilot-scale sample size. Ex vivo analysis was performed using resected pairs of colorectal adenocarcinoma and normal mucosa. Adenocarcinoma was confirmed by histologic evaluation of hematoxylin and eosin (H&E) permanent sections. Specimens were imaged using a custom hyperspectral imaging fluorescence excitation-scanning microscope system. Results demonstrated consistent spectral differences between normal and cancerous tissues over the fluorescence excitation range of 390 to 450 nm that could be the basis for wavelength-dependent detection of colorectal cancers. Hence, excitation-scanning hyperspectral imaging may offer an alternative approach for discriminating adenocarcinoma from surrounding normal colonic mucosa, but further studies will be required to evaluate the accuracy of this approach using a larger patient cohort.
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Affiliation(s)
- Silas J. Leavesley
- University of South Alabama, Department of Chemical and Biomolecular Engineering, 150 Jaguar Drive, SH 4129, Mobile, Alabama 36688, United States
- University of South Alabama, Department of Pharmacology, 5851 USA North Drive, MSB 3372, Mobile, Alabama 36688, United States
- University of South Alabama, Center for Lung Biology, 5851 USA North Drive, MSB 3340, Mobile, Alabama 36688, United States
| | - Mikayla Walters
- University of South Alabama, Department of Chemical and Biomolecular Engineering, 150 Jaguar Drive, SH 4129, Mobile, Alabama 36688, United States
| | - Carmen Lopez
- University of South Alabama, Medical Sciences Program, 5851 USA North Drive, MSB 3340, Mobile, Alabama 36688, United States
| | - Thomas Baker
- University of South Alabama, Department of Pharmacology, 5851 USA North Drive, MSB 3372, Mobile, Alabama 36688, United States
| | - Peter F. Favreau
- University of South Alabama, Department of Chemical and Biomolecular Engineering, 150 Jaguar Drive, SH 4129, Mobile, Alabama 36688, United States
- University of South Alabama, Center for Lung Biology, 5851 USA North Drive, MSB 3340, Mobile, Alabama 36688, United States
| | - Thomas C. Rich
- University of South Alabama, Department of Pharmacology, 5851 USA North Drive, MSB 3372, Mobile, Alabama 36688, United States
- University of South Alabama, Center for Lung Biology, 5851 USA North Drive, MSB 3340, Mobile, Alabama 36688, United States
| | - Paul F. Rider
- University of South Alabama, Department of Surgery, 2451 Fillingim Street, Mastin Building, Suite 701, Mobile, Alabama 36617, United States
| | - Carole W. Boudreaux
- University of South Alabama, Department of Pathology, 2451 Fillingim Street, Mobile, Alabama 36617, United States
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Nawa Y, Inami W, Lin S, Kawata Y, Terakawa S. High-resolution, label-free imaging of living cells with direct electron-beam-excitation-assisted optical microscopy. OPTICS EXPRESS 2015; 23:14561-14568. [PMID: 26072816 DOI: 10.1364/oe.23.014561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High spatial resolution microscope is desired for deep understanding of cellular functions, in order to develop medical technologies. We demonstrate high-resolution imaging of un-labelled organelles in living cells, in which live cells on a 50 nm thick silicon nitride membrane are imaged by autofluorescence excited with a focused electron beam through the membrane. Electron beam excitation enables ultrahigh spatial resolution imaging of organelles, such as mitochondria, nuclei, and various granules. Since the autofluorescence spectra represent molecular species, this microscopy allows fast and detailed investigations of cellular status in living cells.
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Shao X, Zheng W, Huang Z. Polarized near-infrared autofluorescence imaging combined with near-infrared diffuse reflectance imaging for improving colonic cancer detection. OPTICS EXPRESS 2010; 18:24293-300. [PMID: 21164775 DOI: 10.1364/oe.18.024293] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We evaluate the diagnostic feasibility of the integrated polarized near-infrared (NIR) autofluorescence (AF) and NIR diffuse reflectance (DR) imaging technique developed for colonic cancer detection. A total of 48 paired colonic tissue specimens (normal vs. cancer) were measured using the integrated NIR DR (850-1100 nm) and NIR AF imaging at the 785 nm laser excitation. The results showed that NIR AF intensities of cancer tissues are significantly lower than those of normal tissues (p<0.001, paired 2-sided Student's t-test, n=48). NIR AF imaging under polarization conditions gives a higher diagnostic accuracy (of ~92-94%) compared to non-polarized NIR AF imaging or NIR DR imaging. Further, the ratio imaging of NIR DR to NIR AF with polarization provides the best diagnostic accuracy (of ~96%) among the NIR AF and NIR DR imaging techniques. This work suggests that the integrated NIR AF/DR imaging under polarization condition has the potential to improve the early diagnosis and detection of malignant lesions in the colon.
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Affiliation(s)
- Xiaozhuo Shao
- Optical Bioimaging Laboratory, Department of Bioengineering, Faculty of Engineering, National University of Singapore, 117576 Singapore
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Pantalone D, Monici M, Romano G, Cialdai F, Santi R, Fusi F, Comin C, Bechi P. Colonic and gastric cancer metastatic lymph nodes: applications of autofluorescence-based techniques. Oncol Rev 2010. [DOI: 10.1007/s12156-009-0032-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Abstract
Multispectral fluorescence imaging (MSFI) is a rapidly growing field with broad applications in both preclinical and clinical settings. Application of this novel technology in small-animal imaging and microscopy produces enhanced sensitivity and reliable quantification and resolves multiple simultaneous signals. MSFI flow cytometry can quantify multiple fluorescent parameters with morphologic or subcellular spatial details on millions of cells. MSFI has the potential to improve the accuracy of disease detection or differentiation and intrasurgical metastatic diagnosis, guide neurosurgeries, and monitor treatment response.
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Affiliation(s)
- Lanlan Zhou
- Department of Bioengineering, University of Pennsylvania School of Engineering and Applied Science, Philadelphia, Pennsylvania, USA
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