Figure 11.
Duration of SPECT acquisition in units of 100 ms for each of the nine amplitude-binned motion states plotted as a function of projection angle for patient 2. The dashed line shows the idealized case of all the respiratory motion states having evenly distributed time durations for the given angle (i.e., teven). The dotted and dashed lines show the threshold of 0.3 times teven used herein to reject inclusion of projections within reconstruction when estimating motion. Notice that all (nonreference) states would have missing projection angles when estimating motion.