New Sinogram Filter Design Utilizing Sinusoidal Trajectories

Stackgram filtering has recently been found to be very promising way of positron emission tomography (PET) data filtering providing quantitatively better results than common radial sinogram domain filtering. Stackgrams allow separate processing of each sinusoidal trajectory signal but the practical use of stackgrams is restricted by their large size. In this paper we introduce new angular sinogram domain filters approximating the stackgram filters. The structure of these filters gives new insight into the area of sinogram filtering. The filtering results of the proposed sinogram filters are shown to be very close to the results obtained by corresponding stackgram filters and quantitatively better than results obtained by common radial sinogram filtering.