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Proceedings Paper

Spatial resolution in photon diffusion imaging from measurements of time-resolved transmittance
Author(s): Heidrun Wabnitz; R. Willenbrock; Joerg Neukammer; Uwe Sukowski; Herbert H. Rinneberg
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Paper Abstract

We have measured time-resolved transmittance of ps laser pulses through scattering suspensions of thickness d employing time-correlated single photon counting. When absorption is neglected time-resolved transmittance and its Fourier transform can be expressed in terms of scaled variables, i.e. time (Theta) and angular frequency (Omega) , respectively. We have complemented our investigations on resolution by imaging translucent and absorbing objects embedded in animal tissue in vitro. Objects below the resolution limit, i.e. bars with cross sections 6 mm by 3 mm were detected at the center position of tissue being 4 cm thick. This was achieved by selecting sufficiently short initial time intervals, corresponding to fractions f < 0.1, enhancing contrast considerably in this way.

Paper Details

Date Published: 14 September 1993
PDF: 14 pages
Proc. SPIE 1888, Photon Migration and Imaging in Random Media and Tissues, (14 September 1993); doi: 10.1117/12.154674
Show Author Affiliations
Heidrun Wabnitz, Physikalisch-Technische Bundesanstalt (Germany)
R. Willenbrock, Physikalisch-Technische Bundesanstalt (Germany)
Joerg Neukammer, Physikalisch-Technische Bundesanstalt (Germany)
Uwe Sukowski, Physikalisch-Technische Bundesanstalt (Germany)
Herbert H. Rinneberg, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 1888:
Photon Migration and Imaging in Random Media and Tissues
Britton Chance; Robert R. Alfano, Editor(s)

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