Changes to dose in the build-up region when using multi-leaf collimators in place of lead blocks supported on an accessory tray

Doses 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...

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Bibliographic Details
Published in:Radiotherapy and oncology 1995-12, Vol.37 (3), p.225-229
Main Authors: Adams, Elizabeth J., Hounsell, Alan R.
Format: Article
Language:English
Subjects:
Build-up dose
Humans
Lead
Lead blocking
Models, Anatomic
Multi-leaf collimators
Radiation Monitoring - instrumentation
Radiation Protection - instrumentation
Radiodermatitis - etiology
Radiodermatitis - prevention & control
Radiotherapy Dosage
Radiotherapy, High-Energy - instrumentation
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Summary:Doses 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.
ISSN:0167-8140
1879-0887
DOI:10.1016/0167-8140(95)01662-7