Liu N H, Miller M P, Raeside D E, Wizenberg M J
Med Phys. 1981 Nov-Dec;8(6):900. doi: 10.1118/1.595044.
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.
利用实际患者轮廓，研究了在钴 - 60旋转放射治疗治疗计划中准确确定平均组织空气比（TAR）所需半径数量的问题。结果发现，12个半径足以在临床应用中确定平均TAR。
