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Time-resolved optical imaging through turbid media using a fast data acquisition system based on a gated CCD camera

Cosimo D'Andrea, Daniela Comelli, Antonio Pifferi, Alessandro Torricelli, Gianluca Valentini and Rinaldo Cubeddu1

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In this paper, we propose a novel approach for the acquisition of time-resolved data for optical tomography. A fast gated CCD has been used as a parallel detector to acquire in one shot the light intensity exiting a phantom within a very short time slice. By using a pulsed illumination and repeating the acquisition at different delays, the time behaviour of the diffused transmittance can be recorded very quickly. Scattering inclusions embedded in a 5 cm thick phantom have been revealed by fitting a set of 120 images, delayed 50 ps from one another, with a mathematical model based on the random walk theory. Moreover, absorption inclusions have been detected in time-gated images taken at suitable delays.


PACS

87.63.L- Visual imaging

42.30.Wb Image reconstruction; tomography

42.79.Pw Imaging detectors and sensors

Subjects

Optics, quantum optics and lasers

Medical physics

Dates

Issue 14 (21 July 2003)

Received 23 October 2002, in final form 26 March 2003

Published 1 July 2003



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