1. An imaging system, comprising: a view transformation component that includes a microprocessor configured to: receive single proton emission computed tomography (SPECT) acquired projection data of a subject detected with different radii of rotation in a same view across a plurality of individual segments, wherein the acquired projection data is indicative of detected gamma radiation from radionuclide decay occurring in the subject; and transform the acquired projection data in the same view in each of the plurality of individual segments with the different radii to projection data with a common radius of rotation; a segment combiner that combines the transformed projection data to produce a single data set that includes the transformed projection data in the same views across the plurality of individual segments; and a reconstructor that reconstructs the single data set into volumetric image data of the subject.