中国医疗设备
中國醫療設備
중국의료설비
China Medical Devices
2015年
11期
105-106,164
,共3页
宫颈癌%锥形束CT%真空袋%摆位误差
宮頸癌%錐形束CT%真空袋%襬位誤差
궁경암%추형속CT%진공대%파위오차
cervical cancers%cone beam CT%vacuum bag%positioning errors
目的:应用直线加速器机载锥形束CT(CBCT)研究宫颈癌患者的放疗摆位误差,分析误差原因。方法按腰围大小(wc)将32名宫颈癌患者按腰围分为正常组(wc≤80 cm)、超重组(80 cm<wc<90 cm)以及肥胖组(wc≥90 cm)。应用真空袋体模对三组患者进行体位固定,随后行CT扫描定位,在治疗前采用机载CBCT扫描获取图像,并与定位CT图像进行三维配准,记录左右、前后、头脚三个方向(x、 y、z)上的位移数据。结果正常组、超重组、肥胖组患者在x方向上的平均摆位误差分别为(0.8±2.5)mm、(1.5±2.0)mm、(0.2±3.8)mm,在y方向上的平均摆位误差分别为(-1.3±2.1)mm、(-0.5±2.3)mm、(-0.6±3.5)mm,在z方向上的平均摆位误差分别为(0.2±3.8)mm、(-0.6±3.5)mm、(0.9±5.5)mm。结论在宫颈癌患者的放疗过程中,应根据患者的实际情况,判断是否应使用图像引导放疗。对于行动不便、体型较胖或者腹臀部脂肪较多的患者,应尽量采用图像引导放疗。
目的:應用直線加速器機載錐形束CT(CBCT)研究宮頸癌患者的放療襬位誤差,分析誤差原因。方法按腰圍大小(wc)將32名宮頸癌患者按腰圍分為正常組(wc≤80 cm)、超重組(80 cm<wc<90 cm)以及肥胖組(wc≥90 cm)。應用真空袋體模對三組患者進行體位固定,隨後行CT掃描定位,在治療前採用機載CBCT掃描穫取圖像,併與定位CT圖像進行三維配準,記錄左右、前後、頭腳三箇方嚮(x、 y、z)上的位移數據。結果正常組、超重組、肥胖組患者在x方嚮上的平均襬位誤差分彆為(0.8±2.5)mm、(1.5±2.0)mm、(0.2±3.8)mm,在y方嚮上的平均襬位誤差分彆為(-1.3±2.1)mm、(-0.5±2.3)mm、(-0.6±3.5)mm,在z方嚮上的平均襬位誤差分彆為(0.2±3.8)mm、(-0.6±3.5)mm、(0.9±5.5)mm。結論在宮頸癌患者的放療過程中,應根據患者的實際情況,判斷是否應使用圖像引導放療。對于行動不便、體型較胖或者腹臀部脂肪較多的患者,應儘量採用圖像引導放療。
목적:응용직선가속기궤재추형속CT(CBCT)연구궁경암환자적방료파위오차,분석오차원인。방법안요위대소(wc)장32명궁경암환자안요위분위정상조(wc≤80 cm)、초중조(80 cm<wc<90 cm)이급비반조(wc≥90 cm)。응용진공대체모대삼조환자진행체위고정,수후행CT소묘정위,재치료전채용궤재CBCT소묘획취도상,병여정위CT도상진행삼유배준,기록좌우、전후、두각삼개방향(x、 y、z)상적위이수거。결과정상조、초중조、비반조환자재x방향상적평균파위오차분별위(0.8±2.5)mm、(1.5±2.0)mm、(0.2±3.8)mm,재y방향상적평균파위오차분별위(-1.3±2.1)mm、(-0.5±2.3)mm、(-0.6±3.5)mm,재z방향상적평균파위오차분별위(0.2±3.8)mm、(-0.6±3.5)mm、(0.9±5.5)mm。결론재궁경암환자적방료과정중,응근거환자적실제정황,판단시부응사용도상인도방료。대우행동불편、체형교반혹자복둔부지방교다적환자,응진량채용도상인도방료。
Objective To investigate how to measure radiotherapy positioning errors for cervical cancer by cone-beam computed tomography (CBCT) so as to analyze the reasons for errors.Methods According to the waist circumference (wc), the patients were divided into three groups: normal (wc≤80 cm), overweight (80 cm < wc < 90 cm), and fat (wc≥90 cm). The positions of 32 cervical cancer patients were stabilized by vacuum bags, and then location CT scan was performed. Before radiotherapy, the images from CBCT was compared to images from location CT to obtain the shift data. Shift data were recorded in the x-axis (left-right), the y-axis (superior-inferior) and z-axis (head-foot) directions. Results The positioning errors on x direction of three groups of patients were (0.8±2.5) mm, (1.5±2.0) mm, (0.2±3.8) mm; the set-up errors on y direction were (-1.3±2.1) mm, (-0.5±2.3) mm, (-0.6±3.5) mm;the set-up errors on z direction were (0.2±3.8) mm, (-0.6±3.5) mm, (0.9±5.5) mm.Conclusion In the course of radiotherapy for cervical cancer patients, image-guided radiotherapy (IGRT) should be selected according to patients’ physical circumstances. As for fat ifgures, with much fat in abdomen or breech, IGRT should be adopted.