Butler P F, Conway B J, Suleiman O H, Koustenis G H, Showalter C K
Radiology. 1985 Aug;156(2):533-6. doi: 10.1148/radiology.156.2.4011920.
In diagnostic radiology, the routine measurement of exposure levels for a reference patient is an important part of an effective quality assurance program. In the United States, chest radiography is the most frequent examination and has the lowest exposure level of all radiologic examinations. We estimated the amount of exposure an average patient received from both manual and automatic exposure-controlled radiographic techniques by using a "patient-equivalent" chest phantom during measurements. A densitometric procedure was used to assess processor performance. The mean exposure from 194 chest systems was 20 mR (5.16 X 10(-5) C/kg); the mean film density, 1.38; and the mean processing speed, 108. It is interesting to note that a wide range of radiographic techniques, processing conditions, and screen-film speeds are currently being used. With the information given in our study, investigators can begin to identify the problems that lead to unusual exposure levels and, perhaps, poor image quality.
在诊断放射学中，对参考患者的照射水平进行常规测量是有效质量保证计划的重要组成部分。在美国，胸部X线摄影是最常见的检查，并且在所有放射学检查中照射水平最低。我们在测量过程中使用“等效患者”胸部体模估计了普通患者通过手动和自动曝光控制的X线摄影技术所接受的照射量。采用密度测量程序评估冲洗机性能。194个胸部X线摄影系统的平均照射量为20 mR（5.16×10⁻⁵ C/kg）；平均胶片密度为1.38；平均冲洗速度为108。值得注意的是，目前正在使用广泛的X线摄影技术、冲洗条件和增感屏-胶片速度。根据我们研究中给出的信息，研究人员可以开始识别导致异常照射水平以及可能导致图像质量差的问题。
