摘要
目的研究IGPS-O图像引导放疗定位系统联合CT重建图像进行头颈部肿瘤患者精准放疗的应用效果。方法选取2018年8-12月在该院行调强放疗的头颈部肿瘤患者50例,放疗摆位、校位移床后分别对每例患者连续8 d行IGPS-O图像采集与CT重建图像进行骨性标记配准得出患者体位误差。治疗前体位误差为分次间误差,校位移床后误差为分次内误差,分别对分次间和分次内在RL(左右方向)、SI(头脚方向)、AP(腹背方向)3个方向的患者体位误差进行记录和分析。结果>3 mm分次间误差在RL、SI、AP方向分别达到13.3%、24.2%、22.1%。应用IGPS-O图像引导放疗定位系统联合CT重建图像在线校正可实现分次内误差在RL、SI、AP方向均小于3 mm。与治疗前患者体位误差比较,校位移床后的误差显著减小。结论IGPS-O图像引导联合CT重建图像进行体位校正是提高头颈部肿瘤患者精准放疗的有效方法。
Objective To study the application effect of IGPS-O image-guided radiotherapy positioning system combined with CT reconstruction image for precise radiotherapy in the patients with head and neck tumor.Methods Fifty patients with head and neck tumors undergoing the intensity-modulated radiotherapy in this hospital from August to December 2018 were selected.After radiotherapy positioning and bed calibration,each patient conducted the bone marker registration by the IGPS-O image acquisition and CT reconstruction image for consecutive 8 d to obtain the patient′s position error.The position error before treatment was the inter grade error,and the error after correcting the displacement bed was the intra grade error.The position errors of the patients in the left-right direction(RL),head-foot direction(SI)and back-belly direction(AP)in inter grade and intra grade were recorded and analyzed.Results The inter grade error>3 mm reached 13.3%,24.2%and 22.1%in AL,SI and AP directions respectively.Applying the IGPS-O image-guided radiotherapy positioning system combined with CT reconstruction image for conducting the online correction could realize the intra grade error<3 mm in RL,SI and AP directions.Compared with the postural error before treatment,the error after adjusting position and displacing the bed was significantly decreased.Conclusion The IGPS-O image guidance combined with CT reconstruction image for conducting the postural correction is an effective method to improve the accuracy radiotherapy for the patients with head and neck tumors.
作者
梁广立
崔永刚
杜武
LIANG Guangli;CUI Yonggang;DU Wu(Department of Radiotherapy,Tumor Hospital,Tianjin Medical University/National Tumor Clinical Medicine Research Center/Tianjin Key Laboratory of Tumor Prevention and Treatment/Tianjin Malignant Tumor Clinical Medical Research Center,Tianjin 300060,China)
出处
《重庆医学》
CAS
2022年第1期119-121,共3页
Chongqing medicine
关键词
头颈部肿瘤
调强放疗
IGPS-O图像引导放疗定位系统
CT重建图像
体位误差
head and neck tumors
intensity modulated radiation therapy
IGPS-O image guided radiotherapy positioning system
CT reconstruction image
postural error
