Effect Of Slice Thickness On Depth-Dose Distribution Of A Computed Tomography (CT) Scan

Massimiliano Szulc; Philip F. Judy

doi:10.1117/12.957147

6 July 1979 Effect Of Slice Thickness On Depth-Dose Distribution Of A Computed Tomography (CT) Scan

Massimiliano Szulc, Philip F. Judy

Proceedings Volume 0173, Application of Optical Instrumentation in Medicine VII; (1979) https://doi.org/10.1117/12.957147
Event: Application of Optical Instrumentation in Medicine VII, 1979, Toronto, Canada

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).

Citation Download Citation

Massimiliano Szulc and Philip F. Judy "Effect Of Slice Thickness On Depth-Dose Distribution Of A Computed Tomography (CT) Scan", Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); https://doi.org/10.1117/12.957147

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