1. A method for processing data for medical imaging, the method comprising: obtaining a set of continuous bed motion (CBM) data from a first imaging modality, wherein the set of CBM data includes a plurality of gating signals; calculating a CBM normalization matrix using the plurality of gating signals; and reconstructing an image from the CBM data and the CBM normalization matrix, wherein calculating the CBM normalization matrix comprises: calculating a plurality of time windows; calculating a plurality of intersections between the plurality of gating signals and the plurality of time windows; calculating a weighted scanner efficiency using the plurality of intersections; calculating a CBM efficiency by summing the weighted scanner efficiency; and generating a CBM normalization matrix value from the CBM efficiency.