Evaluation of build-up dose from 6 MV X-rays under pelvic and abdominal patient immobilisation devices
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 235-238 |
Journal / Publication | Radiation Measurements |
Volume | 35 |
Issue number | 3 |
Publication status | Published - 2002 |
Link(s)
Abstract
The use of pelvic and abdominal immobilisation devices in radiotherapy is required for accurate positioning and repositioning of patients during their fractionated treatment delivered normally over a period of 5-6 weeks. 6 MV X-rays produced by a medical linear accelerator have a skin sparing effect whereby the skin dose delivered is considerably less than that received by the tumour. The treatment through a vacuum compressed immobilisation device (Vacbag) however increases the dose delivered to the skin by interactions of the X-rays within the Vacbag material. For example, the basal layer doses increased from 16% for an open field to 52% of maximum with a bag thickness of 2.5 cm for a 10 cm × 10 cm field at 6 MV X-ray energy. At the same field size the dermal skin layer (1 mm depth) doses increased from 44% (no bag) to 60% for a bag thickness of 2.5 cm at 6 MV X-rays. The Vacbag should be placed outside the treatment field whenever possible to keep skin dose to a minimum level. © 2002 Published by Elsevier Science Ltd.
Research Area(s)
- Patient immobilisation, Radiotherapy, Skin dose, Vacbag
Citation Format(s)
Evaluation of build-up dose from 6 MV X-rays under pelvic and abdominal patient immobilisation devices. / Cheung, Tsang; Butson, Martin J.; Yu, Peter K.N.
In: Radiation Measurements, Vol. 35, No. 3, 2002, p. 235-238.
In: Radiation Measurements, Vol. 35, No. 3, 2002, p. 235-238.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review