title: Corrections to megavoltage depth-dose values due to reduced backscatter thickness.
abstract: Multiplicative corrections for percent depth-dose values were measured for situations with nonmaximal backscatter because of reduced thickness of the irradiated phantom. Data were obtained for common clinical field sizes for a 60Co beam as well as beams from a 2.5-MV and a 4.0 MV generator. Functional forms, which summarize the results and include field size effects, depth, and thickness of the backscatter medium as variables, were obtained by regression analysis.
mesh_terms: D003037:Cobalt Radioisotopes; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D003037:Cobalt Radioisotopes