1. A method for acquiring and processing an image, comprising: acquiring image data via a detector assembly of an imaging system; utilizing a processor of an imaging processing system of the imaging system to access and execute one or more processor-executable routines encoded on a memory to perform the steps of: gating a set of image data acquired by the detector assembly to generate two or more sets of gated image data; generating a gated image for each set of gated image data; registering the gated images to generate one or more registered images; performing an analysis based on one or more motion-related criteria to generate a respective weighting factor at least for each registered image, wherein performing the analysis to generate the respective weighting factor comprises assigning a weighting factor for a voxel based on a difference between a reference image or an estimated final image and a respective registered image at the voxel and an expected noise level at the voxel; combining at least the registered images based on the respective weighting factors to generate a final image; and displaying the final image on a display.