CT作为一种无创检查设备在医学领域得到广泛的应用,但是受重建方法的限制,它通常只能对相对静止的器官进行扫描断层成像,而对运动物体或器官的成像能力较差,通常会存在运动伪影。克服运动伪影的根本途径就是减少数据采集的时间,这可以通过减少采集范围来实现。中间函数重建算法是一种基于傅里叶空间的重建算法,该算法可以选择感兴趣的部位(ROI)进行局部图像重建,减少数据采集的时间,因此可以使用该算法改善临床上运动物体的扫描成像。
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 it's 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