Law J, Faulkner K, Smith S
Department of Medical Physics and Medical Engineering, Western General Hospital, Edinburgh, UK.
Phys Med Biol. 1989 Jun;34(6):717-25. doi: 10.1088/0031-9155/34/6/007.
In mammography it is important to be able to measure x-ray tube potential with an accuracy of +/- 1 kV or better. Mammography x-ray sets generally use molybdenum for both target and filter. Consequently, a high proportion of the x-ray spectrum consists of characteristic radiation from the target. Devices for estimating tube potential such as penetrameters and digital kV meters, which depend on the relation between tube potential and the filtered x-ray spectrum, could be affected in their performance unless calibrated on similar x-ray sets. This paper reports tube potential measurements on a Mo/Mo x-ray set from 25 to 37 kV using the fluorescence technique, a manufacturer's potential divider, two penetrameters of different design and two digital meters of a single design. Agreement between all four techniques was good, being within the various combined experimental errors associated with each, from 37 down to 28 kV, below which the results diverged only slightly.
在乳腺X线摄影中，能够以±1 kV或更高的精度测量X射线管电压非常重要。乳腺X线摄影X射线机通常在靶和滤过器中都使用钼。因此，X射线谱的很大一部分由靶的特征辐射组成。诸如穿透计和数字千伏计等用于估计管电压的设备，其性能取决于管电压与滤过X射线谱之间的关系，除非在类似的X射线机上进行校准，否则其性能可能会受到影响。本文报告了使用荧光技术、制造商的分压器、两种不同设计的穿透计和两种单一设计的数字仪表，在一台钼/钼X射线机上从25 kV到37 kV进行的管电压测量。所有四种技术之间的一致性良好，在与每种技术相关的各种组合实验误差范围内，从37 kV到28 kV，低于28 kV时结果仅略有差异。
