Reducing image noise by spatial filtering
Before computation of parametric image, it may be necessary to reduce the noise in dynamic PET image. There are different methods for producing smoother images:
Image reconstruction
PET image reconstruction parameters can be changed, either by changing the filter type, or increase the level of filtering. FBP reconstruction gives the same result whether filtering is done in the reconstruction or after it.
Image thresholding
PET images can be thresholded to remove reconstruction artefacts outside the body.
For example, ecatthrs can be used for thresholding dynamic and static PET images.
