全野数字乳腺X线摄影降低辐射剂量的初步研究

发布时间：2018-06-10 16:16

本文选题：X线 + 数字乳腺摄影　；参考：《放射学实践》2015年07期

【摘要】：目的:探讨全野数字乳腺X线摄影的曝光条件,找出影响图像质量和平均腺体剂量(AGD)的因素,为乳腺摄影提供参考。方法:采用GE全野数字乳腺X线机对fluke NA 18-220乳腺模体进行摄影,首先采用AOP模式下的标准模式曝光,压力设定为12daN,厚度为42mm,结果形成28kV,45mAs,Mo/Rh曝光条件,以此为参照基准,设定两组实验:以管电流为单变量,设值为8~90mAs(间隔为机器旋钮可调节的数值);以管电压为单变量,设值为22~36kV(间隔为1),曝光并记录AGD值。上述过程重复3次取平均值。2位影像学医师和1位技师分别独立进行软阅读,参照美国放射学会评分标准,对模体中钙化点、尼龙纤维、肿块灶的显示进行评分。结果:与自动曝光模式相比,手动曝光模式管电压下降3kV,管电流下降20mAs,影像质量符合诊断标准,辐射剂量有效下降。管电压的变化对AGD的影响比管电流要大。结论:以自动条件作为参照标准,在保障图像诊断质量前提下,管电压和管电流可分别有效降低,以减少辐射。
[Abstract]:Objective: To explore the exposure conditions of the digital mammography of the whole field, to find out the factors affecting the image quality and the average dose of glandular dose (AGD), to provide a reference for mammography. Method: the GE whole field digital mammography was used to perform the photography of fluke NA 18-220 breast model body. First, the standard mode exposure under AOP mode was used, the pressure was set to 12daN, the thickness was thicker. The degree is 42mm, which results in 28kV, 45mAs, and Mo/Rh exposure conditions. In this reference basis, two groups of experiments are set: the tube current is a single variable and the value is 8~90mAs (the value of the machine knob is adjustable); the tube voltage is a single variable, the set value is 22~36kV (interval 1), the exposure and the AGD value are recorded. The above process repeats the 3 times.2 bit image of the average value. The doctors and 1 technicians independently performed the soft reading. According to the American Radiological Society score standard, the calcification point, the nylon fiber and the lump focus were scored. Results: compared with the automatic exposure model, the manual exposure mode tube voltage dropped by 3kV, the tube current decreased by 20mAs, the image quality conformed to the diagnostic standard, and the radiation dose was effective. The effect of the change of the tube voltage on the AGD is larger than the tube current. Conclusion: with the automatic condition as the reference standard, the tube voltage and tube current can be effectively reduced on the premise of guaranteeing the quality of the image diagnosis to reduce the radiation.
【作者单位】：上海新华医院;上海GE(中国)有限公司;
【分类号】：R737.9;R730.44

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