这是学习CT图像重建的必备资料，包括图像锐化和滤波等，最重要的内用是CT图像的滤波反投影重建和卷积反投影重建等中间方法的讲解-This is essential to learn CT image reconstruction, including image enhancement and filtering, the most important within the CT images with a filtered back projection reconstruction and convolution back-projection reconstruction method to explain the intermediate