title: Pitfalls in dose calculation using a commercial treatment planning computer for Clinac-4 4MV x-ray beam.
abstract: Dose calculations on a commercial treatment planning computer based on the storage of profile data along a principal axis for Clinac-4 4MV x-ray can lead to significant error in calculated dose in the corners of a large field. These errors are due to the unique nature of the lead flattening filter on Cl-4. A method is suggested to remedy this problem by storing profile data along a diagonal of a large field.
authors.affiliation: Department of Radiology, SUNY, Syracuse 13210.
authors.forename: S C
authors.initials: SC
authors.lastname: Prasad
authors.forename: D A
authors.initials: DA
authors.lastname: Bassano
mesh_terms: D006801:Humans; D010315:Particle Accelerators; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D011882:Radiotherapy, High-Energy / Q000295:instrumentation / Q000379:methods*