CT模拟定位系统外激光中心准确性的质量保证

目的 研究CT模拟定位系统外激光中心准确性的质量保证（BBQA）的摆位、扫描、操作技术及其在CT模拟定位系统质量保证中的作用。方法 Vertical column、BB、Jig、飞利浦PQS—Falcon型CT扫描机及ACQSIM工作站、激光定位系统。扫描BB并将其图像传输到ACQSIM工作站处理，得到等中心坐标后，移动外部激光系统，定位并检测。结果 外激光中心应正好在BB上，如果有超过1mm的误差，则应调整激光定位系统。结论 BBQA在CT模拟定位系统质量保证中占十分重要地位，直接影响到定位的精确度和治疗的准确性及治疗效果。

Quality assurance on accuracy of the external laser centre in CT simulator

Objective Transpherical technique of CT scanner of beekley spot quality assurance (BBQA) and its effect in CT simulator QA.Methods Vertical column,BB,Jig,Philips PQS-Falcon CT, ACQSIM workstation and the laser system were used.Scanning BB was used in sending image to the AC- QSIM workstation.In this system,after describing the BB,isocenter can be established.Then,tile couch with the lasers were moved to the programmed position.Checking was needed.Results The center of the laser should just be found on the BB.Otherwise the laser system should be regulated again.Conclusions Beekley spot quality assurance,being the very important center of any QA program,influences the accuracy of quality of the treatment.