Ewen K, Rösner W
Rontgenblatter. 1984 Jan;37(1):21-5.
Within the framework of quality control measures in x-ray diagnostics and therapy, it is desirable to employ for the determination of tube voltage (e.g. in diagnostic x-ray equipment) methods which are as economical as possible while saving time and being simple to apply in spite of the fact that they are as as highly accurate as ever possible. The absorber method described here, represented by the Ardran-Crooks cassette, possesses the advantage of low price and easy application. However, if it is operated in such a way that time is saved (assessment by the eye), it is not so accurate, whereas in accurate operation (assessment via luxmeter) it does require a relatively large amount of time. After the film has been exposed, it is necessary to estimate or measure the agreement of blackenings on one and the same film in order to determine the tube voltage. This voltage is then read off by means of a calibration curve. The error in the determination of the tube voltage via the Ardran-Crooks cassette depends on the accuracy of the calibration curve, which, in turn, depends on the number of measurements performed when producing the curve, and on the correct voltage of the standard x-ray equipment used in producing the calibration curve. In addition, assessment by eye adds a total error of 2.3% to 8%, depending on the amount of tube voltage. If the luxmeter is used instead of the eye, this additional error is less than 1% in relation to the magnitude of the tube voltage.(ABSTRACT TRUNCATED AT 250 WORDS)
在X射线诊断和治疗的质量控制措施框架内，对于确定管电压（例如在诊断X射线设备中），最好采用尽可能经济、节省时间且易于应用的方法，尽管这些方法要尽可能高度准确。这里描述的吸收体方法，以阿德兰-克鲁克斯暗盒为代表，具有价格低廉和应用简便的优点。然而，如果以节省时间的方式操作（凭肉眼评估），其准确性就不高，而在精确操作（通过照度计评估）时，确实需要相对较长的时间。在胶片曝光后，有必要估计或测量同一张胶片上黑化程度的一致性，以确定管电压。然后通过校准曲线读出该电压。通过阿德兰-克鲁克斯暗盒确定管电压的误差取决于校准曲线的准确性，而校准曲线的准确性又取决于制作曲线时进行的测量次数，以及制作校准曲线时所用标准X射线设备的正确电压。此外，凭肉眼评估会根据管电压的大小增加2.3%至8%的总误差。如果使用照度计而非肉眼评估，相对于管电压的大小，这种额外误差小于1%。（摘要截选至250字）
