CAJ | 학술논문

目的探寻先比较参考层面影像再确定放疗计划射野中心的方法来提高复位精度,并建立适应本科室的鼻咽癌和宫颈癌放疗计划射野中心复位误差的参考标准.方法对50例鼻咽癌和20例宫颈癌患者放疗计划射野中心复位,比较放疗定位时与复位时参考层面和计划中心层面的影像,测量并计算各距离之差.结果 90%以上鼻咽癌病例各距离差值＜2 mm(范围0～2 mm);80%以上宫颈癌计划满足△MU1'和△MU2'均≤5 mm(范围1～5 mm)且其他各差值≤3 mm(范围1～3mm).结论通过比较两组影像确定计划中心位置提高了放疗定位和复位扫描的一致性,有效保证了复位精度,增加复位时中心点位置体表标记的可信度.建立鼻咽癌计划中心各方向误差＜2 mm,宫颈癌计划中心△MU1'≤5 mm,△MU2'≤5 mm且其他各差值≤3 mm的复位标准是可行的.
목적 탐심선비교삼고층면영상재학정방료계화사야중심적방법래제고복위정도,병건립괄응본과실적비인암화궁경암방료계화사야중심복위오차적삼고표준.방법 대50례비인암화20례궁경암환자방료계화사야중심복위,비교방료정위시여복위시삼고층면화계화중심층면적영상,측량병계산각거리지차.결과 90%이상비인암병례각거리차치＜2 mm(범위0～2 mm);80%이상궁경암계화만족△MU1'화△MU2'균≤5 mm(범위1～5 mm)차기타각차치≤3 mm(범위1～3mm).결론 통과비교량조영상학정계화중심위치제고료방료정위화복위소묘적일치성,유효보증료복위정도,증가복위시중심점위치체표표기적가신도.건립비인암계화중심각방향오차＜2 mm,궁경암계화중심△MU1'≤5 mm,△MU2'≤5 mm차기타각차치≤3 mm적복위표준시가행적.
Objective To explore a new method of comparing the references images first to enhance the precision of the central point of the radiation treatment planning(RTP), try to establish a reference standard for this method in the nasopharyngeal cancer(NPC)and carcinoma of utercin cervix in the work of position verification. Methods For 50 RTPs of NPC and 20 RTPs of carcinoma of utercin cervix, the reference-CT-images in set-up and in position verification were compared, and to measure the difference between the two images. Then, in the same way, compare and measure the difference in the central-pointimages. Results For NPC, there was over 90% RTPs in which every difference measured was less than 2 mm;for carcinoma of utercin cervix, over 80% RTPs meet the criterion:the value of △MU1 ' or △MU2' was less than 5 mm and the others are less than 3 mm. Conclusions By comparing the references-CT-images in set-up and in position verification, the precision of the central point of the RTP is enhanced. The marks on the skin become more credible. So, it is feasible to perform the criterions in the work of position verification:for NPC every difference measured is less than 2 mm;for carcinoma of utercin cervix the value of △MU1 ' or △MU2 ' is less than 5 mm and the others are less than 3 mm.