Theoretical determination of the collimator geometrical transfer function for the reconstruction of SPECT data with algorithms based on the numerical inversion of the Radon transform (Q2718065)

Iterative SPECT reconstruction algorithms allow for the inclusion of information related to the geometric system response with accuracy and flexibility. Since the experimental setup of a camera-collimator system may vary considerably, it is necessary to fit the restoration potential of the algorithm to the actual acquisition conditions.NEWLINENEWLINENEWLINEThe method to calculate weighting factors from the theoretical knowledge of the geometric system response of a multihole collimator is developed in order to avoid any experimental procedure. The calculation of the weighting factors is based on an appropriate discretization of the Radon transform whose kernel is modified to describe the variable system response of the collimator.