CAJ | 학술논문

目的评估螺旋断层加速器兆伏级CT图像进行头颈部剂量计算的可行性和准确性。方法使用Cheese Phantom测量MVCT电子密度校准曲线，采集10例鼻咽癌病例的常规CT图像设计调强计划，将计划保持参数不变移植到MVCT图像上进行剂量重算，将重算剂量结果与原计划进行比较，并验证剂量重算的准确性。结果 MVCT的CT值与电子密度呈较好的线性和稳定性，相对剂量分布保持一致，绝对剂量误差均小于±3%。结论 MVCT图像进行头颈部剂量计算具有较好的可靠性，符合临床应用要求。
목적평고라선단층가속기조복급CT도상진행두경부제량계산적가행성화준학성。방법사용Cheese Phantom측량MVCT전자밀도교준곡선，채집10례비인암병례적상규CT도상설계조강계화，장계화보지삼수불변이식도MVCT도상상진행제량중산，장중산제량결과여원계화진행비교，병험증제량중산적준학성。결과 MVCT적CT치여전자밀도정교호적선성화은정성，상대제량분포보지일치，절대제량오차균소우±3%。결론 MVCT도상진행두경부제량계산구유교호적가고성，부합림상응용요구。
Objective To evaluate the feasibility and accuracy of using Megavoltage CT(MVCT) for head and neck dose calculation. Methods The cheese Phantom was imaged using MVCT scanner, and the MVCT value density calibration curve was established. Conventional CT and MVCT image of nasopharyngeal carcinoma was acquired respectively, and IMRT plan was designed on conventional CT image of NPC patient. The conventional CT plan was copied to MVCT image. The dose distribution was calculated for tumor and normal tissue using the MVCT value density calibration curve, and compared with that of conventional CT. Ten NPC patients were col ected for dose verification of IMRT plan on MVCT images. Results The MVCT numbers depended linearly on the electron density of the sample, and the stability of the MVCT numbers to electron density was good.The error between the measured dose and calculated dose in measured point was less than 3%.The isodose distribution was wel agreement with that calculated by planning system. Conclusions Performing dose recalculation using MVCT of Tomotherapy in head and neck region was feasible.and the dose distributions on kVCT and MVCT were in excellent agreement.