US Patent 8175358 Apparatus and method for the processing of perfusion images

The invention relates to an apparatus and a method for the reconstruction of time-dependent cross-sectional images and may be applied for example in perfusion imaging in the vessel system (2) of a patient. According to the method, projections pij are generated from a number M of different directions di and at different times tij. Moreover, the time-dependent intensity function I(x,t) of the reconstructed volume is approximated by a predetermined model function I*(a(x),t), wherein the unknown parameter vector a(x) is estimated for each voxel x. This estimation may be done using the update functions of known reconstruction algorithms like ART for at least N projections pij in each iteration step.