中国医学装备
中國醫學裝備
중국의학장비
CHINA MEDICAL EQUIPMENT
2015年
6期
28-30
,共3页
摆位旋转误差%六维治疗床%旋转误差补偿角度算法%图像引导放射治疗
襬位鏇轉誤差%六維治療床%鏇轉誤差補償角度算法%圖像引導放射治療
파위선전오차%륙유치료상%선전오차보상각도산법%도상인도방사치료
Rotation set-up errors%Six-degree of freedom couch%Compensate angles algorithm%Image guidance radiotherapy
目的：阐述一种在未配备六维治疗床的直线加速器上，使用旋转误差补偿角度消除患者旋转误差的方法。方法：使用锥形束CT(CBCT)获得患者每次六维摆位误差，在刚体假设下，根据摆位误差定义加速器坐标系和患者坐标系的变换矩阵。使用2个独立矢量描述加速器机架角、治疗床转角和准直器转角3个变量，对这2个矢量作坐标变换后，即可得到加速器旋转误差补偿角度。结果：使用加速器旋转误差补偿角度，能完全纠正治疗过程中的摆位旋转误差，纠正旋转误差耗时少，可以加入图像引导放射治疗(IGRT)的日常操作流程中。结论：用旋转误差补偿角度替代六维治疗床，纠正摆位旋转误差的方法简单可行，可以使未配备六维治疗床的加速器具备纠正摆位旋转误差的能力。
目的：闡述一種在未配備六維治療床的直線加速器上，使用鏇轉誤差補償角度消除患者鏇轉誤差的方法。方法：使用錐形束CT(CBCT)穫得患者每次六維襬位誤差，在剛體假設下，根據襬位誤差定義加速器坐標繫和患者坐標繫的變換矩陣。使用2箇獨立矢量描述加速器機架角、治療床轉角和準直器轉角3箇變量，對這2箇矢量作坐標變換後，即可得到加速器鏇轉誤差補償角度。結果：使用加速器鏇轉誤差補償角度，能完全糾正治療過程中的襬位鏇轉誤差，糾正鏇轉誤差耗時少，可以加入圖像引導放射治療(IGRT)的日常操作流程中。結論：用鏇轉誤差補償角度替代六維治療床，糾正襬位鏇轉誤差的方法簡單可行，可以使未配備六維治療床的加速器具備糾正襬位鏇轉誤差的能力。
목적：천술일충재미배비륙유치료상적직선가속기상，사용선전오차보상각도소제환자선전오차적방법。방법：사용추형속CT(CBCT)획득환자매차륙유파위오차，재강체가설하，근거파위오차정의가속기좌표계화환자좌표계적변환구진。사용2개독립시량묘술가속기궤가각、치료상전각화준직기전각3개변량，대저2개시량작좌표변환후，즉가득도가속기선전오차보상각도。결과：사용가속기선전오차보상각도，능완전규정치료과정중적파위선전오차，규정선전오차모시소，가이가입도상인도방사치료(IGRT)적일상조작류정중。결론：용선전오차보상각도체대륙유치료상，규정파위선전오차적방법간단가행，가이사미배비륙유치료상적가속기구비규정파위선전오차적능력。
Objective:The purpose of this paper is to introduce a method of using compensate angles to eliminate rotation set-up errors without six-degree of freedom couch. Methods: To detect six-degree of freedom set-up errors, cone-beam computed tomography (CBCT) scans were acquired. These set-up errors were defined as a matrix to transform from accelerator coordinate system to patient coordinate system. Two independent vectors were defined to describe angles of gantry, collimator and couch in accelerator machine. Transformation of vectors were determined by transformation matrix and re-calculated back to the machine angles. Results:It was found that compensate angles can fully corrected the rotation angles in set-up with limited time consuming. It is feasible to implement compensate angles in routinely radiation procedure. Conclusion:With this method, it is possible to implement the complete corrections of set-up errors in radiotherapy without six-degree of freedom couch and it is convenient in operation as well.
