放射科在多台X光机同时开展工作时由于不同的照射系统，X线球管结构的不同；管电压的波形不同；即使在相同的管电压和相同的管电流（mAs）下，产生的X线的质和量是有较大的差异。也就是说同样的条件，被检体在不同的机器上会产生不一致的影像照片。这对放射科的质量控制、质量 The radiology department is working on multiple X-ray machines at the same time because of different illumination systems, the X-ray tube structure is different; the waveform of the tube voltage is different; even if the same tube voltage and the same tube current (mAs), The quality and quantity of X-rays are quite different. In other words, the same conditions, the subject will produce inconsistent image photos on different machines. This is the quality control and quality of the radiology department.