title: Measurement of the three-dimensional distribution of radiation dose in grid therapy.
abstract: 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.
authors.affiliation: 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
authors.forename: J V
authors.initials: JV
authors.lastname: Trapp
authors.forename: A P
authors.initials: AP
authors.lastname: Warrington
authors.forename: M
authors.initials: M
authors.lastname: Partridge
authors.forename: A
authors.initials: A
authors.lastname: Philps
authors.forename: J
authors.initials: J
authors.lastname: Glees
authors.forename: D
authors.initials: D
authors.lastname: Tait
authors.forename: R
authors.initials: R
authors.lastname: Ahmed
authors.forename: M O
authors.initials: MO
authors.lastname: Leach
authors.forename: S
authors.initials: S
authors.lastname: Webb
mesh_terms: 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
chemical_list: D005782:Gels