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We developed an endorectal time-resolved optical probe aiming at an early detection of prostate tumors targeted by
fluorescent markers. Optical fibers are embedded inside a clinical available ultrasound endorectal probe. Excitation light
is driven sequentially from a femtosecond laser (775 nm) into 6 source fibers. 4 detection fibers collect the medium
responses at the excitation and fluorescence wavelength (850 nm) by the mean of 4 photomultipliers associated with a 4
channel time-correlated single photon counting card.
We also developed the method to process the experimental data. This involves the numerical computation of the
forward model, the creation of robust features which are automatically correctly from numerous experimental possible
biases and the reconstruction of the inclusion by using the intensity and mean time of these features.
To evaluate our system performance, we acquired measurements of a 40 μL ICG inclusion (10 μmol.L-1) at
various lateral and depth locations in a phantom. Analysis of results showed we correctly reconstructed the
fluorophore for the lateral positions (16 mm range) and for a distance to the probe going up to 1.5 cm. Precision of
localization was found to be around 1 mm which complies well with precision specifications needed for the clinical
application.
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Lionel Hervé, Aurélie Laidevant, Mathieu Debourdeau, Jérôme Boutet, Jean-Marc Dinten, "Time resolved optical system for an early detection of prostate tumor," Proc. SPIE 7896, Optical Tomography and Spectroscopy of Tissue IX, 789622 (1 March 2011); https://doi.org/10.1117/12.874575