Aim To research how the non-uniformity in the response of detector elements causes ring artifacts and their different appearance in parallel-beam 2D CT and in fan-beam CT.

• 目的 探讨探测器响应效率不一致导致重建图像中产生伪迹为环形的过程 ；以及在平行束二维CT、扇束二维 CT中的不同表现 .