摘要
目的 定量研究检测设备探头位置变化对牙科全景摄影质量控制检测结果的影响,为分析质量控制检测结果偏差的来源提供参考。方法 选取8种不同型号具有牙科全景摄影功能的X射线设备,利用胶片分析法确定主射束中心轴在影像探测器上的位置,通过辅助移动装置精确控制探头位置,分别在射束中心位置、上下左右移动1 cm位置、上下左右移动2 cm位置测量管电压、辐射输出量和有用线束半值层。结果 在射束中心位置的管电压、辐射输出量和有用线束半值层测量结果数值最大,偏离中心位置数值减小。不同型号的牙科全景设备对于探头位置的敏感性存在较大差异:对于不敏感的设备,探头位置偏差2 cm对管电压检测结果的影响小于5.3 kV(5.8%);而对于敏感的设备,仅2 mm探头位置偏移所导致管电压的检测结果偏差可达5.4 kV(6.0%)。结论 探头位置可导致牙科全景摄影质量控制检测结果的偏差,因此确定主射束中心轴在影像探测器上的位置进行探头的准确摆位对质量控制检测至关重要。
Objective To quantitatively study the influence of changes in probe position on the quality control test results of dental panoramic radiography and to provide a reference for analyzing the sources of deviations in quality control test results.Methods Eight different models of dental panoramic X-ray machines were selected for this study.The film analysis method was used to determine the position of the central axis of the main beam on the image detector.The position of the probe was accurately controlled through an auxiliary moving device.The tube voltage,radiation output,and half-value layer of the useful beam were measured for positions at the center of the beam;1 cm upward,downward,left,and right from the center of the beam;and 2 cm upward,downward,left,and right from the center of the beam.Results The tube voltage,radiation output,and half-value layer had a maximum value at the center of the beam,with a decrease in the value as the position deviated from the center.There were significant differences in the probe position sensitivity between different models of dental panoramic radiography equipment.A 2 cm deviation in the probe position resulted in an impact on the measured tube voltage of less than 5.3 kV(5.8%)for less sensitive equipment.A 2 mm deviation in the probe position resulted in an impact on the measured tube voltage of less than 5.4 kV(6.0%)for sensitive equipment.Conclusion The probe position can lead to deviation in the quality control test results of dental panoramic photography.Therefore,determining the position of the central axis of the main beam on the image detector for accurate positioning of the probe is crucial for quality control testing.
作者
赵文涛
王海鹏
李俊红
季程晨
赵瑄
刘海宽
ZHAO Wentao;WANG Haipeng;LI Junhong;JI Chengchen;ZHAO Xuan;LIU Haikuan(Institute of Radiation Medicine,Fudan University,Shanghai 200032 China)
出处
《中国辐射卫生》
2023年第6期643-647,共5页
Chinese Journal of Radiological Health
基金
国家自然科学基金面上项目(项目编号:12075064)。
关键词
探测器位置
牙科全景摄影
质量控制
Detector position
Dental panoramic radiography
Quality control
