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Rauschendorfer P, Wissmeyer G, Jaffer FA, Gorpas D, Ntziachristos V. Accounting for blood attenuation in intravascular near-infrared fluorescence-ultrasound imaging using a fluorophore-coated guidewire. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:046001. [PMID: 37035030 PMCID: PMC10073749 DOI: 10.1117/1.jbo.28.4.046001] [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: 11/14/2022] [Accepted: 03/20/2023] [Indexed: 05/18/2023]
Abstract
Significance Intravascular near-infrared fluorescence (NIRF) imaging aims to improve the inspection of vascular pathology using fluorescent agents with specificity to vascular disease biomarkers. The method has been developed to operate in tandem with an anatomical modality, such as intravascular ultrasound (IVUS), and complements anatomical readings with pathophysiological contrast, enhancing the information obtained from the hybrid examination. Aim However, attenuation of NIRF signals by blood challenges NIRF quantification. We propose a new method for attenuation correction in NIRF intravascular imaging based on a fluorophore-coated guidewire that is used as a reference for the fluorescence measurement and provides a real-time measurement of blood attenuation during the NIRF examination. Approach We examine the performance of the method in a porcine coronary artery ex vivo and phantoms using a 3.2F NIRF-IVUS catheter. Results We demonstrate marked improvement over uncorrected signals of up to 4.5-fold and errors of < 11 % for target signals acquired at distances up to 1 mm from the catheter system employed. Conclusions The method offers a potential means of improving the accuracy of intravascular NIRF imaging under in vivo conditions.
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Affiliation(s)
- Philipp Rauschendorfer
- Technical University of Munich, Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
| | - Georg Wissmeyer
- Massachusetts General Hospital, Cardiovascular Research Center, Cardiology Division, Boston, Massachusetts, United States
| | - Farouc A. Jaffer
- Massachusetts General Hospital, Cardiovascular Research Center, Cardiology Division, Boston, Massachusetts, United States
- Massachusetts General Hospital, Wellman Center for Photomedicine, Boston, Massachusetts, United States
| | - Dimitris Gorpas
- Technical University of Munich, Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
| | - Vasilis Ntziachristos
- Technical University of Munich, Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Munich, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
- Address all correspondence to Vasilis Ntziachristos,
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2
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Bozhko D, Karlas A, Gorpas D, Ntziachristos V. Optoacoustic sensing of hematocrit to improve the accuracy of hybrid fluorescence-ultrasound intravascular imaging. JOURNAL OF BIOPHOTONICS 2018; 11:e201700255. [PMID: 29341467 DOI: 10.1002/jbio.201700255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 01/12/2018] [Indexed: 06/07/2023]
Abstract
Hybrid intravascular fluorescence-ultrasound imaging is emerging for reading anatomical and biological information in vivo. By operating through blood, intravascular near-infrared fluorescence (NIRF) detection is affected by hemoglobin attenuation. Improved quantification has been demonstrated with methods that correct for the attenuation of the optical signal as it propagates through blood. These methods assume an attenuation coefficient for blood and measure the distance between detector and the vessel wall by observing the intravascular ultrasound images. Assumptions behind the attenuation employed in correction models may reduce the accuracy of these methods. Herein, we explore a novel approach to dynamically estimate optical absorption by using optoacoustic (photoacoustic) measurements. Adaptive correction is based on a trimodal intravascular catheter that integrates fluorescence, ultrasound and optoacoustic measurements. Using the novel catheter, we show how optoacoustic measurements can determine variations of blood absorption, leading to accurate quantification of the detected NIRF signals at different hematocrit values.
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Affiliation(s)
- Dmitry Bozhko
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
- Chair of Biological Imaging, Technische Universität München, Munich, Germany
| | - Angelos Karlas
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
- Chair of Biological Imaging, Technische Universität München, Munich, Germany
| | - Dimitris Gorpas
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
- Chair of Biological Imaging, Technische Universität München, Munich, Germany
| | - Vasilis Ntziachristos
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
- Chair of Biological Imaging, Technische Universität München, Munich, Germany
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3
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Bozhko D, Osborn EA, Rosenthal A, Verjans JW, Hara T, Kellnberger S, Wissmeyer G, Ovsepian SV, McCarthy JR, Mauskapf A, Stein AF, Jaffer FA, Ntziachristos V. Quantitative intravascular biological fluorescence-ultrasound imaging of coronary and peripheral arteries in vivo. Eur Heart J Cardiovasc Imaging 2018; 18:1253-1261. [PMID: 28031233 DOI: 10.1093/ehjci/jew222] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/02/2016] [Indexed: 02/06/2023] Open
Abstract
Aims (i) to evaluate a novel hybrid near-infrared fluorescence-intravascular ultrasound (NIRF-IVUS) system in coronary and peripheral swine arteries in vivo; (ii) to assess simultaneous quantitative biological and morphological aspects of arterial disease. Methods and results Two 9F/15MHz peripheral and 4.5F/40MHz coronary near-infrared fluorescence (NIRF)-IVUS catheters were engineered to enable accurate co-registrtation of biological and morphological readings simultaneously in vivo. A correction algorithm utilizing IVUS information was developed to account for the distance-related fluorescence attenuation due to through-blood imaging. Corrected NIRF (cNIRF)-IVUS was applied for in vivo imaging of angioplasty-induced vascular injury in swine peripheral arteries and experimental fibrin deposition on coronary artery stents, and of atheroma in a rabbit aorta, revealing feasibility to intravascularly assay plaque structure and inflammation. The addition of ICG-enhanced NIRF assessment improved the detection of angioplasty-induced endothelial damage compared to standalone IVUS. In addition, NIRF detection of coronary stent fibrin by in vivo cNIRF-IVUS imaging illuminated stent pathobiology that was concealed on standalone IVUS. Fluorescence reflectance imaging and microscopy of resected tissues corroborated the in vivo findings. Conclusions Integrated cNIRF-IVUS enables simultaneous co-registered through-blood imaging of disease related morphological and biological alterations in coronary and peripheral arteries in vivo. Clinical translation of cNIRF-IVUS may significantly enhance knowledge of arterial pathobiology, leading to improvements in clinical diagnosis and prognosis, and helps to guide the development of new therapeutic approaches for arterial diseases.
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Affiliation(s)
- Dmitry Bozhko
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Eric A Osborn
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA.,Cardiology Division, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Amir Rosenthal
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Johan W Verjans
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA
| | - Tetsuya Hara
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA
| | - Stephan Kellnberger
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany.,Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA
| | - Georg Wissmeyer
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Saak V Ovsepian
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Jason R McCarthy
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA
| | - Adam Mauskapf
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Ashley F Stein
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
| | - Farouc A Jaffer
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA 025114, USA
| | - Vasilis Ntziachristos
- Helmholtz Zentrum München, Institute for Biological and Medical Imaging, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany; Chair for Biological Imaging (CBI), Technische Universität München (TUM), Trogerstr. 9, 81675, Munich, Germany
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4
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Zaman RT, Yousefi S, Long SR, Saito T, Mandella M, Qiu Z, Chen R, Contag CH, Gambhir SS, Chin FT, Khuri-Yakub BT, McConnell MV, Shung KK, Xing L. A Dual-Modality Hybrid Imaging System Harnesses Radioluminescence and Sound to Reveal Molecular Pathology of Atherosclerotic Plaques. Sci Rep 2018; 8:8992. [PMID: 29895966 PMCID: PMC5997702 DOI: 10.1038/s41598-018-26696-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 05/14/2018] [Indexed: 12/21/2022] Open
Abstract
Atherosclerosis is a progressive inflammatory condition caused by an unstable lesion, called thin-cap fibro atheromata (TCFA) that underlies coronary artery disease (CAD)-one of the leading causes of death worldwide. Therefore, early clinical diagnosis and effective risk stratification is important for CAD management as well as preventing progression to catastrophic events. However, early detection could be difficult due to their small size, motion, obscuring 18F-FDG uptake by adjacent myocardium, and complex morphological/biological features. To overcome these limitations, we developed a catheter-based Circumferential-Intravascular-Radioluminescence-Photoacoustic-Imaging (CIRPI) system that can detect vulnerable plaques in coronary arteries and characterizes them with respect to pathology and biology. Our CIRPI system combined two imaging modalities: Circumferential Radioluminescence Imaging (CRI) and PhotoAcoustic Tomography (PAT) within a novel optical probe. The probe's CaF2:Eu based scintillating imaging window provides a 360° view of human (n = 7) and murine carotid (n = 10) arterial plaques by converting β-particles into visible photons during 18F-FDG decay. A 60× and 63× higher radioluminescent signals were detected from the human and murine plaque inflammations, respectively, compared to the control. The system's photoacoustic imaging provided a comprehensive analysis of the plaque compositions and its morphologic information. These results were further verified with IVIS-200, immunohistochemical analysis, and autoradiography.
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Affiliation(s)
- Raiyan T Zaman
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, USA.
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA.
- Department of Radiology, Harvard medical School, Boston, MA, 02115, USA.
- Massachusetts General Hospital 149 13th Street, Room 5406 Charlestown, Massachusetts, 02129, USA.
| | - Siavash Yousefi
- Division of Medical Physics, Department of Radiation Oncology, Stanford University School of Medicine, Stanford, USA
| | - Steven R Long
- Department of Pathology, Stanford University School of Medicine, Stanford, USA
| | - Toshinobu Saito
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, USA
| | - Michael Mandella
- Department of Pediatrics (Neonatology), Stanford University School of Medicine, Stanford, USA
| | - Zhen Qiu
- Department of Radiology, Stanford University School of Medicine, Stanford, USA
- Michigan State University, Michigan, USA
| | - Ruimin Chen
- Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Stanford, USA
| | - Christopher H Contag
- Department of Pediatrics (Neonatology), Stanford University School of Medicine, Stanford, USA
- Department of Radiology, Stanford University School of Medicine, Stanford, USA
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, USA
- Department of Bioengineering, Stanford University Schools of Medicine and of Engineering, Stanford, USA
| | - Sanjiv S Gambhir
- Department of Radiology, Stanford University School of Medicine, Stanford, USA
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA
- Department of Bioengineering, Stanford University Schools of Medicine and of Engineering, Stanford, USA
| | - Frederick T Chin
- Department of Radiology, Stanford University School of Medicine, Stanford, USA
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA
| | | | - Michael V McConnell
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, USA
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA
| | - K Kirk Shung
- Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Stanford, USA
| | - Lei Xing
- Division of Medical Physics, Department of Radiation Oncology, Stanford University School of Medicine, Stanford, USA
- Molecular Imaging Program at Stanford University (MIPS), Stanford University School of Medicine, Stanford, USA
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5
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Calfon Press MA, Mallas G, Rosenthal A, Hara T, Mauskapf A, Nudelman RN, Sheehy A, Polyakov IV, Kolodgie F, Virmani R, Guerrero JL, Ntziachristos V, Jaffer FA. Everolimus-eluting stents stabilize plaque inflammation in vivo: assessment by intravascular fluorescence molecular imaging. Eur Heart J Cardiovasc Imaging 2018; 18:510-518. [PMID: 28039209 DOI: 10.1093/ehjci/jew228] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 10/02/2016] [Indexed: 01/27/2023] Open
Abstract
Aims Inflammation drives atherosclerosis complications and is a promising therapeutic target for plaque stabilization. At present, it is unknown whether local stenting approaches can stabilize plaque inflammation in vivo. Here, we investigate whether everolimus-eluting stents (EES) can locally suppress plaque inflammatory protease activity in vivo using intravascular near-infrared fluorescence (NIRF) molecular imaging. Methods and results Balloon-injured, hyperlipidaemic rabbits with atherosclerosis received non-overlapping EES and bare metal stents (BMS) placement into the infrarenal aorta (n = 7 EES, n = 7 BMS, 3.5 mm diameter x 12 mm length). Four weeks later, rabbits received an injection of the cysteine protease-activatable NIRF imaging agent Prosense VM110. Twenty-four hours later, co-registered intravascular 2D NIRF, X-ray angiography and intravascular ultrasound imaging were performed. In vivo EES-stented plaques contained substantially reduced NIRF inflammatory protease activity compared with untreated plaques and BMS-stented plaques (P = 0.006). Ex vivo macroscopic NIRF imaging of plaque protease activity corroborated the in vivo results (P = 0.003). Histopathology analyses revealed that EES-treated plaques showed reduced neointimal and medial arterial macrophage and cathepsin B expression compared with unstented and BMS-treated plaques. Conclusions EES-stenting stabilizes plaque inflammation as assessed by translational intravascular NIRF molecular imaging in vivo. These data further support that EES may provide a local approach for stabilizing inflamed plaques.
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Affiliation(s)
- Marcella A Calfon Press
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA.,Department of Cardiology, Ronald Reagan Medical Center, University of California in Los Angeles, Los Angeles CA, USA
| | - Georgios Mallas
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA.,Department of Electrical and Computer Engineering, Northeastern University, Boston, MA, USA
| | - Amir Rosenthal
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA.,Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich & Technical University of Munich, Munich, Germany
| | - Tetsuya Hara
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA
| | - Adam Mauskapf
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA
| | - R Nika Nudelman
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich & Technical University of Munich, Munich, Germany
| | | | | | | | | | - J Luis Guerrero
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA
| | - Vasilis Ntziachristos
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich & Technical University of Munich, Munich, Germany
| | - Farouc A Jaffer
- Cardiology Division, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Simches Research Building Room 3206, 185 Cambridge Street, Boston, MA 02114, USA.,Center for Molecular Imaging Research, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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6
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Validating Intravascular Imaging with Serial Optical Coherence Tomography and Confocal Fluorescence Microscopy. Int J Mol Sci 2016; 17:ijms17122110. [PMID: 27983695 PMCID: PMC5187910 DOI: 10.3390/ijms17122110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/25/2016] [Accepted: 12/09/2016] [Indexed: 01/20/2023] Open
Abstract
Atherosclerotic cardiovascular diseases are characterized by the formation of a plaque in the arterial wall. Intravascular ultrasound (IVUS) provides high-resolution images allowing delineation of atherosclerotic plaques. When combined with near infrared fluorescence (NIRF), the plaque can also be studied at a molecular level with a large variety of biomarkers. In this work, we present a system enabling automated volumetric histology imaging of excised aortas that can spatially correlate results with combined IVUS/NIRF imaging of lipid-rich atheroma in cholesterol-fed rabbits. Pullbacks in the rabbit aortas were performed with a dual modality IVUS/NIRF catheter developed by our group. Ex vivo three-dimensional (3D) histology was performed combining optical coherence tomography (OCT) and confocal fluorescence microscopy, providing high-resolution anatomical and molecular information, respectively, to validate in vivo findings. The microscope was combined with a serial slicer allowing for the imaging of the whole vessel automatically. Colocalization of in vivo and ex vivo results is demonstrated. Slices can then be recovered to be tested in conventional histology.
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7
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Gorpas D, Fatakdawala H, Bec J, Ma D, Yankelevich DR, Qi J, Marcu L. Fluorescence lifetime imaging and intravascular ultrasound: co-registration study using ex vivo human coronaries. IEEE TRANSACTIONS ON MEDICAL IMAGING 2015; 34:156-66. [PMID: 25163056 PMCID: PMC4428614 DOI: 10.1109/tmi.2014.2350491] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Fluorescence lifetime imaging (FLIM) has demonstrated potential for robust assessment of atherosclerotic plaques biochemical composition and for complementing conventional intravascular ultrasound (IVUS), which provides information on plaque morphology. The success of such a bi-modal imaging modality depends on accurate segmentation of the IVUS images and proper angular registration between these two modalities. This paper reports a novel IVUS segmentation methodology addressing this issue. The image preprocessing consisted of denoising, using the Wiener filter, followed by image smoothing, implemented through the application of the alternating sequential filter on the edge separability metric images. Extraction of the lumen/intima and media/adventitia boundaries was achieved by tracing the gray-scale peaks over the A-lines of the IVUS preprocessed images. Cubic spline interpolation, in both cross-sectional and longitudinal directions, ensured boundary smoothness and continuity. The detection of the guide-wire artifact in both modalities is used for angular registration. Intraluminal studies were conducted in 13 ex vivo segments of human coronaries. The IVUS segmentation accuracy was assessed against independent manual tracings, providing 91.82% sensitivity and 97.55% specificity. The proposed methodology makes the bi-modal FLIM and IVUS approach feasible for comprehensive intravascular diagnosis by providing co-registered biochemical and morphological information of atherosclerotic plaques.
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Affiliation(s)
- Dimitris Gorpas
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
| | - Hussain Fatakdawala
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
| | - Julien Bec
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
| | - Dinglong Ma
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
| | - Diego R. Yankelevich
- Department of Biomedical Engineering and the Department of Electrical and Computer Engineering, University of California, Davis, CA 95616 USA
| | - Jinyi Qi
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
| | - Laura Marcu
- Department of Biomedical Engineering, University of California, Davis, CA 95616 USA
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8
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Zaman RT, Kosuge H, Pratx G, Carpenter C, Xing L, McConnell MV. Fiber-optic system for dual-modality imaging of glucose probes 18F-FDG and 6-NBDG in atherosclerotic plaques. PLoS One 2014; 9:e108108. [PMID: 25233472 PMCID: PMC4169475 DOI: 10.1371/journal.pone.0108108] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 08/19/2014] [Indexed: 12/02/2022] Open
Abstract
Background Atherosclerosis is a progressive inflammatory condition that underlies coronary artery disease (CAD)–the leading cause of death in the United States. Thus, the ultimate goal of this research is to advance our understanding of human CAD by improving the characterization of metabolically active vulnerable plaques within the coronary arteries using a novel catheter-based imaging system. The aims of this study include (1) developing a novel fiber-optic imaging system with a scintillator to detect both 18F and fluorescent glucose probes, and (2) validating the system on ex vivo murine plaques. Methods A novel design implements a flexible fiber-optic catheter consisting of both a radio-luminescence and a fluorescence imaging system to detect radionuclide 18F-fluorodeoxyglucose (18F-FDG) and the fluorescent analog 6-(N-(7-Nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-6-Deoxyglucose (6-NBDG), respectively. Murine macrophage-rich atherosclerotic carotid plaques were imaged ex vivo after intravenous delivery of 18F-FDG or 6-NBDG. Confirmatory optical imaging by IVIS-200 and autoradiography were also performed. Results Our fiber-optic imaging system successfully visualized both 18F-FDG and 6-NBDG probes in atherosclerotic plaques. For 18F-FDG, the ligated left carotid arteries (LCs) exhibited 4.9-fold higher radioluminescence signal intensity compared to the non-ligated right carotid arteries (RCs) (2.6×104±1.4×103 vs. 5.4×103±1.3×103 A.U., P = 0.008). Similarly, for 6-NBDG, the ligated LCs emitted 4.3-fold brighter fluorescent signals than the control RCs (1.6×102±2.7×101 vs. 3.8×101±5.9 A.U., P = 0.002). The higher uptake of both 18F-FDG and 6-NBDG in ligated LCs were confirmed with the IVIS-200 system. Autoradiography further verified the higher uptake of 18F-FDG by the LCs. Conclusions This novel fiber-optic imaging system was sensitive to both radionuclide and fluorescent glucose probes taken up by murine atherosclerotic plaques. In addition, 6-NBDG is a promising novel fluorescent probe for detecting macrophage-rich atherosclerotic plaques.
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Affiliation(s)
- Raiyan T. Zaman
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
- Division of Radiation Physics, Stanford University School of Medicine, Stanford, California, United States of America
- * E-mail:
| | - Hisanori Kosuge
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Guillem Pratx
- Division of Radiation Physics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Colin Carpenter
- Division of Radiation Physics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Lei Xing
- Division of Radiation Physics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Michael V. McConnell
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
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9
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Ma D, Bec J, Yankelevich DR, Gorpas D, Fatakdawala H, Marcu L. Rotational multispectral fluorescence lifetime imaging and intravascular ultrasound: bimodal system for intravascular applications. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:066004. [PMID: 24898604 PMCID: PMC4045254 DOI: 10.1117/1.jbo.19.6.066004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 05/05/2014] [Accepted: 05/06/2014] [Indexed: 05/24/2023]
Abstract
We report the development and validation of a hybrid intravascular diagnostic system combining multispectral fluorescence lifetime imaging (FLIm) and intravascular ultrasound (IVUS) for cardiovascular imaging applications. A prototype FLIm system based on fluorescence pulse sampling technique providing information on artery biochemical composition was integrated with a commercial IVUS system providing information on artery morphology. A customized 3-Fr bimodal catheter combining a rotational side-view fiberoptic and a 40-MHz IVUS transducer was constructed for sequential helical scanning (rotation and pullback) of tubular structures. Validation of this bimodal approach was conducted in pig heart coronary arteries. Spatial resolution, fluorescence detection efficiency, pulse broadening effect, and lifetime measurement variability of the FLIm system were systematically evaluated. Current results show that this system is capable of temporarily resolving the fluorescence emission simultaneously in multiple spectral channels in a single pullback sequence. Accurate measurements of fluorescence decay characteristics from arterial segments can be obtained rapidly (e.g., 20 mm in 5 s), and accurate co-registration of fluorescence and ultrasound features can be achieved. The current finding demonstrates the compatibility of FLIm instrumentation with in vivo clinical investigations and its potential to complement conventional IVUS during catheterization procedures.
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Affiliation(s)
- Dinglong Ma
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
| | - Julien Bec
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
| | - Diego R. Yankelevich
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
- University of California, Department of Electrical Engineering, 3101 Kemper Hall, Davis, California 95616
| | - Dimitris Gorpas
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
| | - Hussain Fatakdawala
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
| | - Laura Marcu
- University of California, Department of Biomedical Engineering, 451 Health Sciences Drive, Davis, California 95616
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