论文部分内容阅读
目的:应用螺旋断层放射治疗系统的兆伏级CT(megavoltage CT,MVCT)图像引导技术来分析全身一体化固定板在全中枢放疗中的固定效果。方法:回顾性分析10例全中枢放疗患者的摆位误差。所有患者均取仰卧位,并采用全身一体化固定板结合热塑网膜对其进行体位固定。对螺旋断层放射治疗前采集的MVCT图像与定位时的千伏级CT(kilovoltage CT,KVCT)图像进行匹配,从而获得6个自由度方向上的摆位误差。匹配满意后可进行螺旋断层放射治疗;如果匹配不满意,并经放疗科临床医师确认后,需要对患者进行二次摆位。结果:对10例患者共采集159次MVCT图像。左右(left-right,LR)、头足(cranial-caudal,CC)、腹背(anterior-posterior,AP)、pitch、roll和yaw方向上的摆位误差分别为(1.94±1.44)mm、(2.98±2.51)mm、(1.71±1.87)mm、(0.73±0.64)°、(0.30±0.26)°和(0.34±0.31)°。需要进行二次摆位的次数为5次(3.14%)。结论:MVCT图像引导技术可以显著减少全中枢放疗患者的摆位误差。仰卧位全身一体化固定板在全中枢螺旋断层放射治疗中的固定效果是可以被接受的。
OBJECTIVE: To analyze the fixation effect of the whole body integrated radiotherapy in central-central radiotherapy by using the megavoltage CT (MVCT) image guided technique of the spiral computed tomography (CT) system. Methods: A retrospective analysis of 10 patients with central block radiotherapy setting error. All patients were supine position, and the use of the whole body integration of fixed plate combined with the thermo-retinal fixed position. The MVCT images acquired before spiral CT were matched with the kilovoltage CT (KVCT) images during positioning to obtain the setup errors in six degrees of freedom. If the match is satisfied, spiral CT may be performed. If the match is unsatisfactory and confirmed by radiotherapy clinician, the patient needs to be placed twice. Results: A total of 159 MVCT images were collected in 10 patients. The setup errors in left-right (LR), cranial-caudal (CC), anterior-posterior (AP), pitch, roll and yaw directions were (1.94 ± 1.44) mm, ± 2.51) mm, (1.71 ± 1.87) mm, (0.73 ± 0.64) °, (0.30 ± 0.26) ° and (0.34 ± 0.31) ° respectively. The number of times the second position needs to be done is 5 times (3.14%). Conclusion: The MVCT image guidance technique can significantly reduce the setting errors of patients undergoing total central radiation therapy. Superimposition of the whole body fixation plate fixation in the whole central spiral CT radiotherapy in the fixed effect can be accepted.