CAJ | 학술논문

目的:盆腔调强放疗计划会在肿瘤靶区周围产生剂量的梯度陡降,因此对患者的精确摆位至关重要.摆位误差一旦超可控范围,肿瘤靶区周围的正常组织将受不必要的照射. 本文为量化放疗摆位方法的科学性,并且讨论体重指数对摆位误差的影响.方法:对我科2014年1~6月通过盆腔调强放疗治疗的35名妇科肿瘤患者分别进行多组CT图像的采集,获得患者在RL(左右),SI(头脚)和AP(腹背)方向的偏移数据,从而计算出摆位误差,验证摆位方法.同时,我们通过多次测算每个患者体重指数,将其平均值与其个体误差数据进行比对,了解体重、身高等因素对摆位误差的影响. 结果:系统误差在RL、SI和AP方向分别为2.1、2.4和3.0 mm,随机误差在RL、SI和AP方向分别为2.8、2.6和3.5 mm. 结论:肯定了摆位方法的科学合理,确定了CTV到PTV的外扩边界大小,患者摆位误差与体重指数并无相关性.
목적:분강조강방료계화회재종류파구주위산생제량적제도두강,인차대환자적정학파위지관중요.파위오차일단초가공범위,종류파구주위적정상조직장수불필요적조사. 본문위양화방료파위방법적과학성,병차토론체중지수대파위오차적영향.방법:대아과2014년1~6월통과분강조강방료치료적35명부과종류환자분별진행다조CT도상적채집,획득환자재RL(좌우),SI(두각)화AP(복배)방향적편이수거,종이계산출파위오차,험증파위방법.동시,아문통과다차측산매개환자체중지수,장기평균치여기개체오차수거진행비대,료해체중、신고등인소대파위오차적영향. 결과:계통오차재RL、SI화AP방향분별위2.1、2.4화3.0 mm,수궤오차재RL、SI화AP방향분별위2.8、2.6화3.5 mm. 결론:긍정료파위방법적과학합리,학정료CTV도PTV적외확변계대소,환자파위오차여체중지수병무상관성.
Intensity-modulated whole pelvic radiation therapy (IM-WPRT) plans result in steep dose gradients around the target volume, and thus accurate patient setup is essential. We will quantify the accuracy of our patient positioning, and discuss the effect of body mass index of setup error. Methods: We examined the CT images of 35 women treated with IM-WPRT at our institution, get the data in three directions (RL,SI and AP),and calculate the setup error in patients treated with IM-WPRT to verify patient positioning. Calculating the average of body mass index (BMI), we find there is a relationship between the setup error and BMI. Results:In three directions(RL,SI and AP),the systematic error is 2.1 mm,2.4 mm and 3.0 mm,and the random error is 2.8 mm,2.6 mm and 3.5 mm. Conclusion:Determine the CTV to PTV outside enlarge border size,we make the IM-WPRT plan more scientific. There was no correlation between the magnitude of these errors and the BMI.