Tatcher M, Palti S
Radiology. 1983 Feb;146(2):527-9. doi: 10.1148/radiology.146.2.6849101.
Density correction factors for 60Co gamma rays and 8-MV x rays were measured with an ionization chamber in water-equivalent phantoms containing simulated lung or bone inhomogeneities larger or smaller than the beam (beam sizes, 5 x 5 to 30 x 30 cm). Measurements were compared with values calculated from the effective SSD method, the generalized Batho power law method, and a simplified equivalent tissue-air ratio (SETAR) method. The results indicate that the SETAR method gives the best overall agreement with experimental values, while the effective SSD and Batho algorithms are accurate only in certain situations. The SETAR method seems adequate for most clinical applications.
使用电离室在含有模拟肺或骨不均匀性（大于或小于射野，射野尺寸为5×5至30×30 cm）的水等效体模中测量了60Coγ射线和8 MV X射线的密度校正因子。将测量结果与通过有效源皮距（SSD）法、广义巴托幂律法和简化等效组织空气比（SETAR）法计算得到的值进行了比较。结果表明，SETAR法与实验值的总体一致性最佳，而有效SSD法和巴托算法仅在某些情况下准确。SETAR法似乎适用于大多数临床应用。
