在长期的放射工作中，发现曲面断层影像上部区域总是有 些模糊，而下部区域就显得清晰的多。对此我们作了实验与研 究，发现这种机器的断层方式独特，在其断层域上，利用Ｘ线束 的斜射线与直射线各有独道之处。因此造成照射野上部和下部影像清晰度的差别。要充分发挥这种机器的 In long-term radiological work, it is found that the upper area of ​​the curved tomographic image is always somewhat blurred, while the lower area is much clearer. In this regard, we made experiments and research and found that this machine has a unique fault pattern. In its fault domain, the use of X-ray beam oblique and straight rays have their own way. Thus causing the differences between the upper and lower image sharpness of the irradiation field. To give full play to this machine