Sontag M R, Battista J J, Bronskill M J, Cunningham J R
Radiology. 1977 Jul;124(1):143-9. doi: 10.1148/124.1.143.
Patient inhomogeneity information is investigated for use in radiotherapy planning. Absorbed doses measured in a phantom are compared to doses calculated for photon beams using various treatment planning inhomogeneity correction methods. Delineation of inhomogeneities with a spatial resolution of 5 mm and with an electron density accuracy of 2% in usually sufficient to allow doses to be calculated with a mean accuracy of better than 2% for 60Co and 3% for 25-MV x rays if the authors' Equivalent Tissue-Air Ratio Method is used.
研究患者的不均匀性信息以用于放射治疗计划。将在体模中测量的吸收剂量与使用各种治疗计划不均匀性校正方法计算的光子束剂量进行比较。如果使用作者的等效组织空气比方法，以5毫米的空间分辨率和2%的电子密度精度描绘不均匀性，通常足以使60Co的剂量计算平均精度优于2%，25兆伏X射线的剂量计算平均精度优于3%。
