Measurement of the three-dimensional distribution of radiation dose in grid therapy.
A single large dose of megavoltage x-rays delivered through a grid is currently being utilized by some centres for palliative radiotherapy treatments of large tumours. In this note, we investigate the dosimetry of grid therapy using two-dimensional film dosimetry and three-dimensional gel dosimetry. It is shown that the radiation dose is attenuated more rapidly with depth in a grid field than an open field, and that even shielded regions receive approximately 25% of the dose to the unshielded areas.
Trapp
J V
JV
Joint Department of Physics, The Institute of Cancer Research and the Royal Marsden NHS Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, UK. Jamie.Trapp@rmit.edu.au
Warrington
A P
AP
Partridge
M
M
Philps
A
A
Glees
J
J
Tait
D
D
Ahmed
R
R
Leach
M O
MO
Webb
S
S
D019583:Dose Fractionation, Radiation; D005782:Gels / Q000737:chemistry / Q000528:radiation effects; D006801:Humans; D009369:Neoplasms / Q000473:pathology / Q000532:radiotherapy; D011829:Radiation Dosage; D011882:Radiotherapy, High-Energy / Q000295:instrumentation / Q000379:methods*; D013679:Technology, Radiologic
D005782:Gels