螺旋CT扫描和非螺旋CT扫描最大的不同是（ ）The biggest difference between helical CT scan and non-helical CT scan is
A: 曝光参数Exposure parameters
B: 被检者体位Subject position
C: 模数转换方式methods of A/D conversion
D: 数据采集方式methods of data acquisition
E: 图像的后处理Post processing of images