Figure 8.13, The responses in frequency domain (top row) as well as the discretized spatial domain kernels (bottom row) of the Ram-Lak and Shepp-Logan filters - Medical Imaging Systems - NCBI Bookshelf
6: Product of a typical smoothing filter and Ram-Lak filter, often used... | Download Scientific Diagram
Investigation of effect of reconstruction filters on cone-beam computed tomography image quality | SpringerLink
Note on radon and iradon transforms and Matlab's iradon on the all-at-once call vs. the one-at-time call