瓦里安Clinac iX直线加速器容积弧形调强放射治疗多叶光栅联锁的检修

Troubleshooting of multi-leave collimators in Varian Clinac iX Linear Accelerator during volumetric modulated arc therapy delivering

1故障现象执行容积弧形调强放射治疗（volumetric modulated arc therapy,VMAT）时,机架旋转到340°至60°之间报多叶光栅（multi-leaf collimators,MLC）联锁。2故障分析加速器型号为瓦里安i X,MLC型号为瓦里安MLC-120-（[1,2]）。出现该故障时查看MLC的位置。