Butson M J, Yu P K, Metcalfe P E
City University of Hong Kong, Department of Physics and Materials Science, Kowloon Tong.
Phys Med Biol. 1998 Sep;43(9):2647-50. doi: 10.1088/0031-9155/43/9/015.
A radiotheraphy skin dose profile can be obtained with radiochromic film. The central axis skin dose relative to Dmax for a 10 x 10 cm2 field size was found to be 22%, 17% and 15.5% for 6 MV, 10 MV and 18 MV photon beams. Peripheral dose increased with increasing field size. At 10 MV the skin dose 2 cm outside the geometric field edge was measured as 6%, 10% and 17% for 10 x 10 cm2, 20 x 20 cm2 and 30 x 30 cm2 field sizes respectively. Off-axis skin dose decreased as distance increased from central axis for fields with Perspex block trays. For a 20 x 20 cm2 field, an approximately 5-8% drop in percentage skin dose was observed from central axis to the beam edge.
利用放射变色胶片可获得放射治疗皮肤剂量分布。对于10×10 cm²的射野尺寸，6 MV、10 MV和18 MV光子束的中心轴皮肤剂量相对于Dmax分别为22%、17%和15.5%。周边剂量随射野尺寸增大而增加。在10 MV时，对于10×10 cm²、20×20 cm²和30×30 cm²的射野尺寸，在几何射野边缘外2 cm处测得的皮肤剂量分别为6%、10%和17%。对于带有有机玻璃挡块托盘的射野，离轴皮肤剂量随距中心轴距离的增加而降低。对于20×20 cm²的射野，从中心轴到射野边缘，皮肤剂量百分比下降约5 - 8%。
