title: A technique for scatter dose calculation.
abstract: The intent of this article is twofold: to gain a basic understanding of radiotherapy dosimetric techniques that separate primary radiation dose from tissue scatter dose, and to introduce the use of a polar grid to simplify manual calculation of scatter dose in irregularly blocked fields. This technique requires the introduction of a new term, 'scatter-pixel,' which is defined in terms of more familiar expressions. Finally, the polar grid technique is evaluated against measured data for various cases of blocking and contour fall-off.
mesh_terms: D003201:Computers; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D012542:Scattering, Radiation