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17 February 2014 Optimal arrangements of fiber optic probes to enhance the spatial resolution in depth for 3D reflectance diffuse optical tomography with time-resolved measurements performed with fast-gated single-photon avalanche diodes
Agathe Puszka, Laura Di Sieno, Alberto Dalla Mora, Antonio Pifferi, Davide Contini, Gianluca Boso, Alberto Tosi, Lionel Hervé, Anne Planat-Chrétien, Anne Koenig, Jean-Marc Dinten
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Proceedings Volume 8937, Multimodal Biomedical Imaging IX; 89370Z (2014) https://doi.org/10.1117/12.2036351
Event: SPIE BiOS, 2014, San Francisco, California, United States
Abstract
Fiber optic probes with a width limited to a few centimeters can enable diffuse optical tomography (DOT) in intern organs like the prostate or facilitate the measurements on extern organs like the breast or the brain. We have recently shown on 2D tomographic images that time-resolved measurements with a large dynamic range obtained with fast-gated single-photon avalanche diodes (SPADs) could push forward the imaged depth range in a diffusive medium at short source-detector separation compared with conventional non-gated approaches. In this work, we confirm these performances with the first 3D tomographic images reconstructed with such a setup and processed with the Mellin- Laplace transform. More precisely, we investigate the performance of hand-held probes with short interfiber distances in terms of spatial resolution and specifically demonstrate the interest of having a compact probe design featuring small source-detector separations. We compare the spatial resolution obtained with two probes having the same design but different scale factors, the first one featuring only interfiber distances of 15 mm and the second one, 10 mm. We evaluate experimentally the spatial resolution obtained with each probe on the setup with fast-gated SPADs for optical phantoms featuring two absorbing inclusions positioned at different depths and conclude on the potential of short source-detector separations for DOT.
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Agathe Puszka, Laura Di Sieno, Alberto Dalla Mora, Antonio Pifferi, Davide Contini, Gianluca Boso, Alberto Tosi, Lionel Hervé, Anne Planat-Chrétien, Anne Koenig, and Jean-Marc Dinten "Optimal arrangements of fiber optic probes to enhance the spatial resolution in depth for 3D reflectance diffuse optical tomography with time-resolved measurements performed with fast-gated single-photon avalanche diodes", Proc. SPIE 8937, Multimodal Biomedical Imaging IX, 89370Z (17 February 2014); https://doi.org/10.1117/12.2036351
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KEYWORDS
Spatial resolution
Sensors
Avalanche photodiodes
Diffuse optical tomography
Fiber optics
3D metrology
Photons
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