使用投影数据项，CT图像重建所需的背投影数据被内插，所述投影数据项是通过扫描位于患者(100)某个截面之前或之后的患者(100)截面而产生-Generating projection data items used, CT image reconstruction data required for back projection is interpolated, the projection data items are located by scanning the patient (100) before or after a cross section of a section of patients (100)