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Nouizi F, Kwong TC, Ruiz J, Cho J, Chan YW, Ikemura K, Erkol H, Sampathkumaran U, Gulsen G. A thermo-sensitive fluorescent agent based method for excitation light leakage rejection for fluorescence molecular tomography. Phys Med Biol 2019; 64:035007. [PMID: 30561380 DOI: 10.1088/1361-6560/aaf96d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Fluorescence molecular tomography (FMT) is widely used in preclinical oncology research. FMT is the only imaging technique able to provide 3D distribution of fluorescent probes within thick highly scattering media. However, its integration into clinical medicine has been hampered by its low spatial resolution caused by the undetermined and ill-posed nature of its reconstruction algorithm. Another major factor degrading the quality of FMT images is the large backscattered excitation light component leaking through the rejection filters and coinciding with the weak fluorescent signal arising from a low tissue fluorescence concentration. In this paper, we present a new method based on the use of a novel thermo-sensitive fluorescence probe. In fact, the excitation light leakage is accurately estimated from a set of measurements performed at different temperatures and then is corrected for in the tomographic data. The obtained results show a considerable improvement in both spatial resolution and quantitative accuracy of FMT images due to the proper correction of fluorescent signals.
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Affiliation(s)
- Farouk Nouizi
- Department of Radiological Sciences, Tu and Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA 92697, United States of America
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Lu Y, Darne CD, Tan IC, Wu G, Wilganowski N, Robinson H, Azhdarinia A, Zhu B, Rasmussen JC, Sevick-Muraca EM. In vivo imaging of orthotopic prostate cancer with far-red gene reporter fluorescence tomography and in vivo and ex vivo validation. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:101305. [PMID: 23797877 PMCID: PMC3710157 DOI: 10.1117/1.jbo.18.10.101305] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 05/21/2013] [Accepted: 05/21/2013] [Indexed: 05/22/2023]
Abstract
Fluorescence gene reporters have recently become available for excitation at far-red wavelengths, enabling opportunities for small animal in vivo gene reporter fluorescence tomography (GRFT). We employed multiple projections of the far-red fluorescence gene reporters IFP1.4 and iRFP, excited by a point source in transillumination geometry in order to reconstruct the location of orthotopically implanted human prostate cancer (PC3), which stably expresses the reporter. Reconstruction was performed using a linear radiative-transfer-based regularization-free tomographic method. Positron emission tomography (PET) imaging of a radiolabeled antibody-based agent that targeted epithelial cell adhesion molecule overexpressed on PC3 cells was used to confirm in vivo GRFT results. Validation of GRFT results was also conducted from ex vivo fluorescence imaging of resected prostate tumor. In addition, in mice with large primary prostate tumors, a combination of GRFT and PET showed that the radiolabeled antibody did not penetrate the tumor, consistent with known tumor transport limitations of large (∼150 kDa) molecules. These results represent the first tomography of a living animal using far-red gene reporters.
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Affiliation(s)
- Yujie Lu
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Chinmay D. Darne
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - I-Chih Tan
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Grace Wu
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Nathaniel Wilganowski
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Holly Robinson
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Ali Azhdarinia
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Banghe Zhu
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - John C. Rasmussen
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
| | - Eva M. Sevick-Muraca
- University of Texas Health Science Center at Houston, The Brown Foundation Institute of Molecular Medicine, Center for Molecular Imaging, 1825 Pressler Street SRB 330, Houston, Texas 77030
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Zhu B, Rasmussen JC, Lu Y, Sevick-Muraca EM. Reduction of excitation light leakage to improve near-infrared fluorescence imaging for tissue surface and deep tissue imaging. Med Phys 2011; 37:5961-70. [PMID: 21158309 DOI: 10.1118/1.3497153] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
PURPOSE Fluorescence-enhanced optical imaging using near-infrared (NIR) light developed for in vivo molecular targeting and reporting of various diseases provides promising opportunities for diagnostic imaging. However, the measurement sensitivity of NIR fluorescence (NIRF) optical imaging systems is limited by the leakage of the strong backscattered excitation light through rejection filters. In this article, the authors present a systematic method for improving sensitivity and validating the NIRF optical imager currently used for clinical imaging of human lymphatic function. METHODS The proposed systemic method consists of an appropriate filter combination and a collimation optics adapted to an NIRF optical imager. The spectral contributions were first assessed due to the excitation light backscattered from the tissue and from non-normal-incidence of the excitation light on the optical filters used in the authors' NIRF clinical imaging system. Then two tests were conducted to assess the system with and without the components of appropriate filters combination and collimation optics using: (1) a phantom to evaluate excitation light leakage as a function of target depth and (2) deployment in an actual human study. RESULTS The phantom studies demonstrate as much as two to three orders of magnitude reduction in the transmission ratio, indicating that the excitation light leakage can be reduced upon using the appropriate filter combination and collimation optics while an in vivo investigatory human study confirms improved imaging. CONCLUSIONS The method for reducing the excitation light leakage is presented for validating collected signals for fluorescence imaging.
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Affiliation(s)
- Banghe Zhu
- Center of Molecular Imaging, The Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
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Li M, Zhang Y, Bai J. In Vivo Diffuse Optical Tomography and Fluorescence Molecular Tomography. JOURNAL OF HEALTHCARE ENGINEERING 2010. [DOI: 10.1260/2040-2295.1.3.477] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Biswal NC, Gamelin JK, Yuan B, Backer MV, Backer JM, Zhu Q. Fluorescence imaging of vascular endothelial growth factor in tumors for mice embedded in a turbid medium. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:016012. [PMID: 20210458 PMCID: PMC2839800 DOI: 10.1117/1.3306704] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2009] [Revised: 11/23/2009] [Accepted: 11/24/2009] [Indexed: 05/27/2023]
Abstract
We demonstrate the feasibility of fluorescence imaging of deeply seated tumors using mice injected with an angiogenesis tracer, a vascular endothelial growth factor conjugated with the infrared dye cyanine 7 (VEGF/Cy7). Our optical-only imaging reconstruction method separately estimates the target depth, and then applies this information to reconstruct functional information such as fluorophore concentration. Fluorescence targets with concentrations as low as sub-25 nM are well reconstructed at depths up to 2 cm in both homogeneous and heterogeneous media with this technique.
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Affiliation(s)
- Nrusingh C Biswal
- University of Connecticut, Department of Electrical and Computer Engineering, Storrs, Connecticut 06269, USA
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