瓦里安iX加速器kV级CBCT图像环状伪影故障排除  

Varian IX accelerator kV class CBCT image ring-shaped artifact troubleshooting

作　　者：刘胤良 翟福山[1] 吕树庄 牛蔚涛 Liu Yinliang;Zhai Fushan;Lyu Shiizhuang;Niu Weitao(Department of Radiotherapy,Third Hospital of Hebei Medical University,Shijiazhuang 050051,China)

机构地区：[1]河北医科大学附属第三医院放疗科,石家庄050051

出　　处：《中华放射肿瘤学杂志》2019年第2期158-160,共3页Chinese Journal of Radiation Oncology

摘　　要：影像引导系统中软硬件故障都有可能造成环状伪影图像,硬件老化引起此现象较为常见,故障排除应优先检查基础硬件有无明显故障,后采集OBI本底图像确认坏点状态,若有坏点未被屏蔽可按步骤通过更新图像处理坏点补偿时所调用的Pixel Correction Maps补偿坏点并进行图像校准,若仍无法修复可考虑更换探测板。锥形束CT影像引导系统是现代放疗中体位方向和摆位精度的重要验证方式,是放疗安全性和精准性的有力保障。应充分了解其老化规律,定期保养设备和验证图像质量,才能保证设备正常运行。The hardware and software faults in the image guidance system may cause ring-shaped artifacts,which is more commonly induced by the aging of the hardware.During troubleshooting,the first step should he checking whether there are obvious faults in the basic hardware.Subsequently,OBI background image is collected to confirm the bad point status.If the bad point is not shielded,it can be compensated by updating the image processing had point.The invoked Pixel Correction Maps are adopted compensate for the bad point and calibrate the image.If it is still unable to repair,replacing the detection hoard can be considered.Cone-beam CT(CBCT)image guidance system is an important approach to verify the position orientation and positioning accuracy in modern radiotherapy,which effec tively guarantees for the safety and accuracy of radiotherapy.We should fully understand its law of aging,maintain the equipment on a regular basis and verify the image quality to ensure the normal operation of the equipment.

关 键 词：锥形束CT 图像伪影 故障排除 

分 类 号：R197.39[医药卫生—卫生事业管理]