18 December 1995 Contrast and spatial resolution of time-resolved transillumination images
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Abstract
We have recorded time-resolved transillumination images of solid phantoms with objects embedded differing in their scattering and absorption coefficients from those of the bulk material. The optical properties of the phantoms were chosen similar to those of human breast tissue. Several quantities such as fractional transmittance and first moments as well as Fourier amplitudes and phase shifts have been derived from measured distributions of times of flight to form two-dimensional images. We discuss contrast and effective signal to noise ratio of such images. Assuming homogeneous optical properties, from an analysis of the Fourier transforms of the measured distributions of times of flight we have obtained effective (frequency dependent) transport scattering and absorption coefficients as a function of scanning position. The coefficients deduced in this way are in qualitative agreement with the known optical properties of the bulk of the phantoms and the embedded objects.
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Dirk Grosenick, Heidrun Wabnitz, Herbert H. Rinneberg, "Contrast and spatial resolution of time-resolved transillumination images", Proc. SPIE 2626, Photon Propagation in Tissues, (18 December 1995); doi: 10.1117/12.228667; https://doi.org/10.1117/12.228667
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