As with the transaxial geometric factors, time-window alignment factors can be derived from the data acquired using rotating transmission sources, planar sources or scanning line sources. Non-uniform illumination is compensated for, and the data are then corrected for intrinsic detector efficiency, block profile and all geometric effects. Data elements with common block detector combinations are summed to produce an array with one element for each block combination. This array is then divided by the mean of all its elements and inverted to yield the tuivj.
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