射波刀放疗中相关螺旋CT定位条件的探讨  

Discussion of the Location Conditions of Spiral CT in Cyberknife Radiotherapy

作　　者：陈国梁 赵瑞 李俊杰 李莎 CHEN Guoliang;ZHAO Rui;LI Junjie;LI Sha(Department of Radiation Oncology, LanZhou General Hospital of PLA, Lanzhou Gansu 730050, Chin)

机构地区：[1]解放军兰州总医院放疗科,甘肃兰州730050

出　　处：《中国医疗设备》2018年第5期90-92,共3页China Medical Devices

摘　　要：目的探讨射波刀放疗CT定位相关条件。方法采取不同螺距、重建层厚,使用西门子大孔径64层螺旋CT对胸部肿瘤体模扫描;利用西门子CT工作站计算软件测量,观察肿瘤体模体积、长径及CT值变化。结果不同扫描螺距对肿瘤体积、肿瘤长径、CT值基本无影响,肿瘤体积、CT值随重建层厚的增加整体呈现减小趋势,肿瘤长径随着重建层厚增加呈现不规则波动趋势;当重建层厚>1.5 mm时,所测肿瘤体积随重建层厚增加明显变小,重建层厚为5 mm时肿瘤体积变化高达23%。结论为保证放疗质量,应严格按照射波刀使用要求进行CT定位。Objective To investigate the location conditions of spiral CT in Cyberknife radiotherapy. Methods Siemens big bore 64 slice spiral CT was used to scan the chest tumor phantom with different pitch and reconstruction slice thickness. The tumor phantom volume, length and CT value with the software of Siemens CT workstation was measured and the changes of the tumor volume, length and CT value was observed. Results Different scanning pitch had no effect on tumor volume, tumor length and CT value. The tumor volume and CT value decreased with the increase of the thickness of the reconstructed layer. The tumor size increased with the thickness of the reconstructed layer. When the slice thickness was more than 1.5 mm, the tumor volume was signifcantly decreased with the thickness of the reconstructed layer. When the reconstruction slice thickness was 5 mm, the tumor volume changeed up to 23%. Conclusion In order to ensure the quality of cyberknife radiotherapy, the CT location condition should be executed strictly in cyberknife locating requirements.

关 键 词：射波刀 放射治疗 重建层厚 螺距 肿瘤 

分 类 号：R734[医药卫生—肿瘤]