１故障现出（１）做头部扫描时，图像有较严重的干扰骨线，即使在头颅的第５、６层部位，也有较强的骨线，用体模扫描肺部遇有锁骨时，也呈现较强的骨线，骨线均呈放射状，。ｇａｎｔｒｙ正、反转扫描时故障表现有差异：正转时不明显，反转时则很明显。（２）ｇａｎｔｒｙ反转 1Faulty appearance (1) When doing a head scan, the image has more severe interference of the bony line. Even in the 5th and 6th layers of the skull, there is a strong bony line. When the phantom is used to scan the lungs, the clavicle is scanned. , also showed a strong bone line, bone lines were radial. The gantry positive and negative scans have different fault performances: they are not obvious during forward rotation, and are obvious when reversed. (2) Reverse gantry