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以自行研制的焦点位置精度测试仪，对三台日本岛津产Ｘ线机所属５个球管焦点位置的精度进行了测试研究。指出：焦点位置精度测定是研究焦点线量分布和图像成像质量的重要手段之一。并强调指出：焦点位置精度应作为Ｘ线管的重要技术参数之一。
With the self-developed focus position precision tester, the accuracy of the focus position of five spherical tubes belonging to the three Shimadzu X-ray machines in Japan was tested. It is pointed out that the determination of the focus position accuracy is one of the important means to study the distribution of focus line and the image quality. And stressed that: the focus of position accuracy should be as one of the X-ray tube important technical parameters.