In recent years, the mainly development of CT technology are from non- spiral CT to spiral CT, from single-slice spiral CT to multi-slice spiral CT, from simple source spiral CT to double source spiral CT.

• 近年来,CT技术的发展主要表现在:从非螺旋CT到螺旋CT、从单层螺旋CT到多层螺旋CT、从单源螺旋CT到双源螺旋CT。