title: Confirmation of a speculation concerning average tissue-air ratio determinations for rotational Co-60 radiation therapy treatment planning.
abstract: The question of the number of radii which are necessary to accurately determine the average tissue-air ratio (TAR) to be used in 60Co rotational radiation therapy treatment planning was studied using actual patient contours. It was found that 12 radii adequately determine the average TAR for clinical purposes.
mesh_terms: D003037:Cobalt Radioisotopes / Q000627:therapeutic use*; D006801:Humans; D008953:Models, Anatomic; D010347:Patient Care Planning / Q000379:methods*; D011867:Radioisotope Teletherapy / Q000379:methods*; D011879:Radiotherapy Dosage
chemical_list: D003037:Cobalt Radioisotopes