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Proceedings Paper

Tomographic characterization of human breast models by laser transllumination
Author(s): S. Chacko; M. Singh
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Paper Abstract

Transillumination is a diagnostic technique based on the differences on the diffused transmittance in the visible or near- infrared radiations. A system has been developed by combining computed tomography and transillumination to obtain cross- sectional images of human breast models. The light from a 15 mW He-Ne laser ( 632.8 nm) is transmitted through an optical fibre of 1 mm core diameter to a cylindrical lens assembly to obtain a fan beam configuration to illuminate the model. The scanning of the model is carried out by three stepper motor arrangement which carries upward-downward, rotational and pitch movements. A curved array 16 photodiodes measure the transmitted light through the model. At each position along the height 50 projections are taken. Data acquisition and processing are carried out by PC-AT 386 equipped with ADC card. Based on this a tomogram is constructed. The experiments are carried out with foam models with and without embedded abnormalities. By reconstructing the tomograms at various heights, the size and shape of the embedded abnormality in the model are determined.

Paper Details

Date Published: 2 January 1998
PDF: 6 pages
Proc. SPIE 3211, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, (2 January 1998); doi: 10.1117/12.345521
Show Author Affiliations
S. Chacko, Indian Institute of Science (India)
M. Singh, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 3211:
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96
J. P. Raina; P. R. Vaya, Editor(s)

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