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Proceedings Paper

Effect Of Slice Thickness On Depth-Dose Distribution Of A Computed Tomography (CT) Scan
Author(s): Massimiliano Szulc; Philip F. Judy
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Paper Abstract

The effect on dose of varying the imaging slice thickness in computed tomography was evaluated. A cylindrical Plexiglas phantom (20 cm diameter, 15 cm length) was used. The dose at each depth was estimated from measured dose profiles. The maximum surface dose was independent of slice thickness. The minimum surface dose in the scan plane increased with slice thickness. This indicated that scatter contributes to the dose in the scan plane. A computer program has been developed. It predicted the maximum surface dose for a scan procedure with an accuracy of ±1.2 mrad/mAs. The model takes the effect of scatter into account, assuming a zero-th order scattering cross section, which is a constant, independent of photon energy. A least squares fit with the experimental data permitted to estimate the scattering cross section (.095 cm 2/g, for the 10 mm slice thickness).

Paper Details

Date Published: 6 July 1979
PDF: 6 pages
Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); doi: 10.1117/12.957147
Show Author Affiliations
Massimiliano Szulc, Harvard Medical School (United States)
Philip F. Judy, Harvard Medical School (United States)

Published in SPIE Proceedings Vol. 0173:
Application of Optical Instrumentation in Medicine VII
Joel E. Gray, Editor(s)

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