1. A compound collimator for use in a radionuclide emission tomography camera to image a region of an object, comprising a collimator structure having a plurality of collimator elements arranged in at least two sections to define a different tomographic field of view boundary for each section, each boundary encompassing a different portion of the region and the sections in combination establishing a different imaging sensitivity for each portion, and at least one of the boundaries encompassing the entire region to be imaged.