因为 X 线 CT 的射线剂量是决定 CT 图象质量的主要因素之一,所以除对稳压系统有特殊要求以外,保护和监测系统与普通 X 线机相比也有很大差别,特别是采用高压电容放电形式的机器。因此不能简单地象普通 X 线机那样利用高压线圈中心接地的方法来测量电流。因为那样所测得的电流是充放电流之和,而充电流不产生 X 线,只有放电电流才能表示 X 线量。普通 X 线测量电流的位置,是用两只继电 X-ray CT radiation dose is one of the main factors that determine the quality of CT images, so in addition to the special requirements of the voltage regulator system, the protection and monitoring system is also very different from the normal X-ray machine, especially the use of high-pressure Capacitor discharge form of the machine. Therefore, it is not easy to measure the current simply by using the method of grounding the center of the high-voltage coil like a conventional X-ray machine. Because then the measured current is the sum of the charge and discharge currents, and the charge current does not generate X-rays, only the discharge current can represent the amount of X-rays. Ordinary X-ray measurement of the current location is the use of two relays