1. A method of imaging at least a part of a region of interest (ROI) comprising: moving a source relative to the ROI in a trajectory; collecting data from at least one sensor as the source moves relative to the ROI; and generating a substantially exact reconstruction of the ROI based on the data collected, wherein the ROI comprises the breast of a patient; and wherein the data collected comprises truncated data, wherein generating the substantially exact reconstruction of the ROI based on the data collected comprises backprojecting the truncated data to generate an intermediate object function and filtering the intermediate object function to create the substantially exact image reconstruction.