CAJ | 학술논문

目的：通过由图像引导的加速器配备的锥形束CT( Cone beam CT,CBCT)了解本中心现有的定位方式引起的临床上的摆位误差,指导制定放射治疗计划过程中的PTV( planning target volume)外放范围。方法：在放射治疗过程中,完成病人摆位后拍摄病人的锥形束CT图像与治疗计划设计时的CT图像的匹配,获得病人的摆位误差,把其平均值和标准差分别做为系统误差和随机误差,通过公式MPTV(外放)=2.5Σ+0.7σ获得三维方向上的肿瘤靶区外放边界。结果：得到校位前病人三个方向的外放数据如下 X=5.80mm,Y=6.22mm,Z=5.06mm。校位后病人三个方向上的外放数据如下：X=2.55mm,Y=2.79mm,Z=1.93mm。结论：图像引导放射治疗方式可有效减小肿瘤靶区的外放边界,两种治疗方式应选择不同的外放边界。
목적：통과유도상인도적가속기배비적추형속CT( Cone beam CT,CBCT)료해본중심현유적정위방식인기적림상상적파위오차,지도제정방사치료계화과정중적PTV( planning target volume)외방범위。방법：재방사치료과정중,완성병인파위후박섭병인적추형속CT도상여치료계화설계시적CT도상적필배,획득병인적파위오차,파기평균치화표준차분별주위계통오차화수궤오차,통과공식MPTV(외방)=2.5Σ+0.7σ획득삼유방향상적종류파구외방변계。결과：득도교위전병인삼개방향적외방수거여하 X=5.80mm,Y=6.22mm,Z=5.06mm。교위후병인삼개방향상적외방수거여하：X=2.55mm,Y=2.79mm,Z=1.93mm。결론：도상인도방사치료방식가유효감소종류파구적외방변계,량충치료방식응선택불동적외방변계。
Objective:To study the positioning errros data caused by positioning method,the data were obtained from CBCT images and were used to guide the PTV margin clinically. Methods:CBCT images during the course of radiotherapy after completion of patient positioning were matched with CT images of the treatment planning,then the mean value and standard deviation of the positioning errros data were obtained,the external tumor target boundaries In three dimensions direction were obtained by the formula of MPTV(free)=2. 5Σ +0. 7σ and systematic errors and random errors as the mean value and standard deviation of the positioning errros data. Results:The external data in three directions pre-correction as follows:X=5. 80mm,Y=6. 22mm,Z=5. 06mm,the external data in three directions post-correction as follows:X = 2. 55 mm, Y = 2. 79 mm, Z = 1. 93 mm. Conclusion:Image-guided radiotherapy methods can effectively reduce the external tumor target boundaries, both treatment methods should choose a different external boundaries.