As a kind of uninjurious examination instrument,CT has gained wide use in medical diagnosis. But it is mostly used in stationary organ because of it's reconstruction method,and for its' moving artifacts in image it is seldom used in moving organ. Intermediate function reconstruction algorithm which is based on Fourier space can be used to reconstruct ROI image,so using this algorithm can reduce data acquisition time. This characteristic can improve the quality of moving object scan and image reconstruction