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Soloviev VY, Zacharakis G, Spiliopoulos G, Favicchio R, Correia T, Arridge SR, Ripoll J. Tomographic imaging with polarized light. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2012; 29:980-8. [PMID: 22673429 DOI: 10.1364/josaa.29.000980] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report three-dimensional tomographic reconstruction of optical parameters for the mesoscopic light scattering regime from experimentally obtained datasets by using polarized light. We present a numerically inexpensive approximation to the radiative transfer equation governing the polarized light transport. This approximation is employed in the reconstruction algorithm, which computes two optical parameters by using parallel and perpendicular polarizations of transmitted light. Datasets were obtained by imaging a scattering phantom embedding highly absorbing inclusions. Reconstruction results are presented and discussed.
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Affiliation(s)
- Vadim Y Soloviev
- Department of Computer Science, University College London, London, UK.
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Soloviev VY, McGinty J, Stuckey DW, Laine R, Wylezinska-Arridge M, Wells DJ, Sardini A, Hajnal JV, French PMW, Arridge SR. Förster resonance energy transfer imaging in vivo with approximated radiative transfer equation. APPLIED OPTICS 2011; 50:6583-6590. [PMID: 22193187 PMCID: PMC3492744 DOI: 10.1364/ao.50.006583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe a new light transport model, which was applied to three-dimensional lifetime imaging of Förster resonance energy transfer in mice in vivo. The model is an approximation to the radiative transfer equation and combines light diffusion and ray optics. This approximation is well adopted to wide-field time-gated intensity-based data acquisition. Reconstructed image data are presented and compared with results obtained by using the telegraph equation approximation. The new approach provides improved recovery of absorption and scattering parameters while returning similar values for the fluorescence parameters.
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Affiliation(s)
- Vadim Y Soloviev
- Department of Computer Science, University College London, London, UK.
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Soloviev VY, Arridge SR. Fluorescence lifetime optical tomography in weakly scattering media in the presence of highly scattering inclusions. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2011; 28:1513-1523. [PMID: 21734752 DOI: 10.1364/josaa.28.001513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We consider the problem of fluorescence lifetime optical tomographic imaging in a weakly scattering medium in the presence of highly scattering inclusions. We suggest an approximation to the radiative transfer equation, which results from the assumption that the transport coefficient of the scattering media differs by an order of magnitude for weakly and highly scattering regions. The image reconstruction algorithm is based on the variational framework and employs angularly selective intensity measurements. We present numerical simulation of light scattering in a weakly scattering medium that embeds highly scattering objects. Our reconstruction algorithm is verified by recovering optical and fluorescent parameters from numerically simulated datasets.
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Affiliation(s)
- Vadim Y Soloviev
- Department of Computer Science, University College London, Gower Street, London WC1E 6BT, United Kingdom.
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McGinty J, Stuckey DW, Soloviev VY, Laine R, Wylezinska-Arridge M, Wells DJ, Arridge SR, French PMW, Hajnal JV, Sardini A. In vivo fluorescence lifetime tomography of a FRET probe expressed in mouse. BIOMEDICAL OPTICS EXPRESS 2011; 2:1907-17. [PMID: 21750768 PMCID: PMC3130577 DOI: 10.1364/boe.2.001907] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/06/2011] [Accepted: 06/10/2011] [Indexed: 05/06/2023]
Abstract
Förster resonance energy transfer (FRET) is a powerful biological tool for reading out cell signaling processes. In vivo use of FRET is challenging because of the scattering properties of bulk tissue. By combining diffuse fluorescence tomography with fluorescence lifetime imaging (FLIM), implemented using wide-field time-gated detection of fluorescence excited by ultrashort laser pulses in a tomographic imaging system and applying inverse scattering algorithms, we can reconstruct the three dimensional spatial localization of fluorescence quantum efficiency and lifetime. We demonstrate in vivo spatial mapping of FRET between genetically expressed fluorescent proteins in live mice read out using FLIM. Following transfection by electroporation, mouse hind leg muscles were imaged in vivo and the emission of free donor (eGFP) in the presence of free acceptor (mCherry) could be clearly distinguished from the fluorescence of the donor when directly linked to the acceptor in a tandem (eGFP-mCherry) FRET construct.
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Affiliation(s)
- James McGinty
- Photonics Group, Blackett Laboratory, Imperial College London, London SW7 2BW, UK
- These authors contributed equally to this work
| | - Daniel W. Stuckey
- MRC Clinical Sciences Centre, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK
- These authors contributed equally to this work
| | - Vadim Y. Soloviev
- Department of Computer Science, University College London, London WC1E 6BT, UK
| | - Romain Laine
- Photonics Group, Blackett Laboratory, Imperial College London, London SW7 2BW, UK
| | | | - Dominic J. Wells
- Department of Veterinary Basic Sciences, The Royal Veterinary College, London NW1 0TU, UK
| | - Simon R. Arridge
- Department of Computer Science, University College London, London WC1E 6BT, UK
| | - Paul M. W. French
- Photonics Group, Blackett Laboratory, Imperial College London, London SW7 2BW, UK
| | - Joseph V. Hajnal
- MRC Clinical Sciences Centre, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK
| | - Alessandro Sardini
- MRC Clinical Sciences Centre, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK
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