Changes to dose in the build-up region when using multi-leaf collimators in place of lead blocks supported on an accessory tray.
AffiliationNorth Western Medical Physics Department, Christie Hospital, Manchester, UK.
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AbstractDoses in the build-up region have been compared for regular fields with and without a perspex accessory tray and for two irregular fields defined by either a Philips multi-leaf collimator (MLC) or lead blocks. The results show an increase in doses within the build-up region, by up to a factor of two, primarily due to the presence of the accessory tray. Fields shaped with the MLC exhibited build-up characteristics similar to those in unblocked fields and hence there will be systematic changes to the build-up dose when treatments are transferred from lead blocking techniques to those using an MLC mounted within the treatment head.
CitationChanges to dose in the build-up region when using multi-leaf collimators in place of lead blocks supported on an accessory tray. 1995, 37 (3):225-9 Radiother Oncol
JournalRadiotherapy and Oncology