摘要
目的用胶片剂量计测量γ-刀剂量学参数,比较不同软件对同一台γ-刀验证胶片的分析结果的差异,分析产生差异的原因及胶片剂量计检测的影响因素,为今后修订相关检测规范提供依据。方法用胶片剂量计对γ-刀照射野尺寸与标称值最大偏差、焦平面上照射野半影宽度等剂量学参数进行检测,用2套不同的胶片剂量分析软件对同一台γ-刀的验证胶片进行分析,用SPSS 11.0进行分析结果的配对t检验。结果 2种软件对玛西普SRRS型头部γ-刀照射野尺寸与标称值最大偏差的分析结果显示两者差异无统计学意义(t=0.844,P>0.05),对GMBS型体部γ-刀照射野尺寸与标称值最大偏差的分析结果显示两者差异无统计学意义(t=0.561,P>0.05);对SRRS型头部γ-刀不同尺寸准直器的照射野半影宽度的分析结果表明两者差异有统计学意义(t=-4.365,P<0.01),对GMBS型体部γ-刀不同尺寸准直器的照射野半影宽度的分析结果表明两者差异有统计学意义(t=-5.497,P<0.01)。结论胶片剂量计检测γ-刀剂量学参数的影响因素很多,剂量分析软件是很重要的影响因素。不同的胶片剂量分析软件对同一套γ-刀验证胶片的分析结果有差异。
Objective To analyze the difference and its affecting factors in testing the same γ-knife using film dosimetry with two kinds of analysis software,in order to provide reference in revising the specification for testing in the future.Methods The dose parameters of γ-knife were tested by film dosimetry and the validated films were analyzed with two kinds of analysis software,and SPSS 11.0 software was used for statistical analysis.Results There was no significant difference in the radiation field measured and the maximum deviation of normal value of SRRS head γ-knife and GMBS body γ-knife between the two software（t=0.844,0.561,P0.05）.However,the analysis on the radiation field＇s penumbra region width of collimators,which had different sizes of SRRS head γ-knife and GMBS body γ-knife,indicated that the differences were significant（t=-4.365,-5.497,P0.01）.Conclusion This study shows that there are many factors affecting film dosimetry＇s testing parameters of γ-knife while film dose analysis software is very important.Two kinds of film dose analysis software have some differences in analysis of the same γ-knife validation film.
出处
《中国职业医学》
CAS
北大核心
2011年第1期33-37,共5页
China Occupational Medicine
