In-room imaging and MR planning

Filtered Backprojection

With FBP, not so much can be optimized, except for the reconstruction kernel, which can be chosen to control the Modulation Transfer Function (i.e. the spatial frequency response of the algorithm).

Smooth kernels reduce noise and spatial frequency. Sharp kernels allow to see more fine structures, but introduce more noise in the image.

MTFs

Furthermore: - all approximations done to solve the inverse problem might generate artifacts, - to reconstruct an image, the rotation must be at least 180° plus fan angle.