Beam scanning system for a clinical pi-meson beam
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IEEE
(0) (0 Votes)Views: (2011) Date: (Publication Date: Mar 1986) Pages: () -
Author: Lam G. K. Y. Harrison R. W. Kornelsen R. O. Skarsgard L. D. Batho Biomedical Facility TRIUMF University of British Columbia 4004 Wesbrook Mall Vancouver British Columbia Canada V6T 2A3 Division of Radiation Physics Cancer Control Agency of British Columbia 600 West 10th Avenue Vancouver British Columbia Canada V5Z 4E6 and Medical Biophysics Unit British Columbia Cancer Research Centre 601 West 10th Avenue Vancouver British Columbia Canada V5Z 1L3;
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Abstract: Abstract A beam delivery system for large uniform dose fields suitable for cancer radiotherapy has been constructed for the TRIUMF pion treatment facility using discrete step beam scanning in three dimensions. The patient on a couch is scanned laterally relative to a pencil beam in a raster fashion. At each spot, the depth dose profile is delivered by range modulations using a range shifter. The operations of the scanning couch and range shifter are synchronized by the use of beam monitor pulses from a beam intensity integrating system. The system is hence versatile enough to handle treatment volume of highly irregular shape and yet is immune to fluctuations in accelerator output.
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