x射线管摆脱了高压电缆，在机架内的“滑环”上连续旋转，床层在机架内以匀

The x-ray tube gets rid of the high-voltage cable and continuously rotates on the "slip ring" in the frame, and the bed moves at a constant speed (in and out) in the frame. The "collimated" rays (fan-shaped beam) of the selected layer thickness form a spiral scan track on the patient's body, and the information collected by the spiral scan is reconstructed into a layer image by a computer. Single-slice spiral CT appeared in the mid-1980s and was basically discontinued at the end of the last century.

The x-ray tube gets rid of the high-voltage cable and rotates continuously on the "slip ring" in the rack, with the bed moving at a constant speed (in and out) within the frame. The selected layer of thick "quasi-straight" rays (fan beams) form a spiral scan trajectory on the patient's body, and the information collected by the spiral scan is reconstructed by a computer into a layered image. The single-layer spiral CT appeared in the mid-1980s and was largely discontinued at the end of the last century.

The X-ray tube gets rid of the high-voltage cable and rotates continuously on the "slip ring" in the frame. The bed moves in and out of the frame at a uniform speed. The "collimated" ray (fan beam) with selected layer thickness forms spiral scanning track on the patient's body, and the information collected by spiral scanning is reconstructed into layer image by computer. Single slice spiral CT appeared in the mid-1980s, and almost stopped production at the end of last century.<br>