X线机的机械性能好坏可以直接影响质量。机械性能中从床面及中心线是否标准至为重要。操作者若要对机械性能有所了解就必须测试,一般医院特别是广大农村医院不一定有专门的测试设备。笔者曾用铅笔进行了床面水平及球管中心线的准确度测定,颇感经济简便,故介绍于下: X-ray machine mechanical properties can have a direct impact on quality. It is of paramount importance whether the machine is standard from the bed and centerline. The operator must know about the mechanical properties of the test, the general hospital, especially the vast rural hospitals do not necessarily have specialized test equipment. I used to pencil the level of the ball and the centerline of the ball tube determination of accuracy, quite economical and simple, it is introduced in the next: