CAJ | 학술논문

目的：在体部立体定向放射治疗（ SBRT ）中，利用锥形束CT （ CBCT ）比较软组织匹配及骨解剖匹配的精度，评估组织内部和组织之间瞬间平移在肺癌病人肿瘤中心位置的旋转误差，实现在线校正。方法选用美国瓦里安公司的具有机载影像系统（ On－borad－imager，OBI）的clinac－ix直线加速器治疗机治疗的肺癌患者8例。通过CBCT对SBRT每位患者治疗前后进行比较，评价体内组织瞬间的平移和旋转导致患者体位和肿瘤中心位置数值的变化。结果骨解剖匹配和软组织匹配的区别在于体位变化是3．0 mm（0～8．3 mm），病人的肿瘤位置变化是1．4 mm（0～12．2 mm）和2．2mm（0～13．2 mm）。这个中心偏移中位数是2．2 mm（0～4．7 mm），其余系统误差和随机误差约1°。结论在肺癌的立体SBRT的转换改进治疗过程中，肿瘤中心位置的改变主要是受机体内部组织瞬间平移和旋转所影响。
목적：재체부입체정향방사치료（ SBRT ）중，이용추형속CT （ CBCT ）비교연조직필배급골해부필배적정도，평고조직내부화조직지간순간평이재폐암병인종류중심위치적선전오차，실현재선교정。방법선용미국와리안공사적구유궤재영상계통（ On－borad－imager，OBI）적clinac－ix직선가속기치료궤치료적폐암환자8례。통과CBCT대SBRT매위환자치료전후진행비교，평개체내조직순간적평이화선전도치환자체위화종류중심위치수치적변화。결과골해부필배화연조직필배적구별재우체위변화시3．0 mm（0～8．3 mm），병인적종류위치변화시1．4 mm（0～12．2 mm）화2．2mm（0～13．2 mm）。저개중심편이중위수시2．2 mm（0～4．7 mm），기여계통오차화수궤오차약1°。결론재폐암적입체SBRT적전환개진치료과정중，종류중심위치적개변주요시수궤체내부조직순간평이화선전소영향。
Obj ective In the body of stereotactic radiotherapy ( SBRT ) , using Cone Beam is the matc-hing precision of soft tissue and bone anatomy ,translation between evaluation organization and internal organiza-tion in the rotation of the lung cancer patients with tumor location error ,location correction .Methods Applica-tion varian companies in the United States has the airborne imaging system clinac -ix linear accelerator apparatus treatment of 8 cases of lung cancer patients .By CBCT and SBRT comparison before and after the treatment for each patient and evaluate internal instant translation and rotation of the body of the patients with SBRT postures , tumor location and tumor center of baseline shift score changes .Results Based on the difference between of the anatomy of the bone and soft tissue match position is 3.0 mm(0~8.3 mm).The patient′s tumor location in 3-d median change is 1.4 mm(0~12.2 mm)and 12.2 mm(0~13.2 mm).The median baseline offset between 3 d score is 2.2 mm(0~4.7 mm).The rest of the system error and random error about 1 °.Conclusion In Lung cancer SBRT transformation to improve treatment of lung tumor process , change the position of tumor center is mainly affected by the body′s internal organization instant translation and rotation .