射波刀治疗床修正值对六维颅骨追踪总体精度的影响  

Relationship between Cyber Knife couch correction and tracking accuracy of 6D Skull

作　　者：王涛[1] 沈君姝[1] 周含[1] 彭家华[1] 朱锡旭[1] 李兵[1] 

机构地区：[1]南京军区南京总医院放疗科,南京210002

出　　处：《医疗卫生装备》2015年第6期92-94,共3页Chinese Medical Equipment Journal

摘　　要：目的 :探讨射波刀治疗床可修正值与六维颅骨(6D Skull)靶区追踪总体精度的关系。方法 :通过影像引导将治疗床移至所需修正位置进行6D Skull球方模型定位精度测试,将测试结果与修正值为0相比较及分析。结果:治疗床3个平移方向修正值为0、3、6、10 mm,靶区追踪总体精度分别为0.23、0.32、0.53、0.55 mm;治疗床3个旋转方向修正值为(0.3、0.3、1°)、(0.6、0.6、2°)、(1、1、3°),靶区追踪总体精度分别为0.12、0.99、0.78 mm;治疗床3个平移方向和3个旋转方向修正值为(3、3、3 mm,0.3、0.3、1°)、(6、6、6 mm,0.6、0.6、2°)、(10、10、10 mm,1、1、3°),靶区追踪总体精度分别为0.08、0.8、1.4 mm。结论:射波刀6D Skull靶区追踪总体精度随着治疗床3个平移方向或(和)3个旋转方向修正值的增加而增大,日常治疗摆位时应尽可能地减小治疗床的修正值。Objective To investigate the relation between Cyberknife couch correction and target tracking total accuracy of6 D Skull. Methods The couch was shifted to the desired position with image guidance, and positioning accuracy of the ball-cubes model was tested based on 6D Skull. The errors were compared with the result of the condition when the couch correction value was zero. Results When couch correction values in three translation directions were 0, 3, 6 and10 mm, target tracking total accuracies were 0.23, 0.32, 0.53 and 0.55 mm respectively; when couch correction values in three rotation directions were（0.3, 0.3, 1°）,（0.6, 0.6, 2°）,（1, 1, 3°）, target tracking total accuracies were 0.12, 0.99 and0.78 mm respectively; when couch correction values in three translation and rotation directions were（3, 3, 3 mm and 0.3,0.3, 1°）,（6, 6, 6 mm and 0.6, 0.6, 2°）,（10, 10, 10 mm and 1, 1, 3°）, target tracking total accuracies were 0.08, 0.8 and1.4 mm respectively. Conclusion The tracking accuracy of Cyber Knife 6D Skull is increasing along with the increase of couch correction in three translation and rotation directions, so that the couch correction has to be reduced in daily set-up as soon as possible.

关 键 词：射波刀 治疗床修正 追踪精度 

分 类 号：R815[医药卫生—放射医学]