Abstract
The localized depression of activity in the centre of images from MUP-PET positron camera has been identified by modelling as one feature of an artefact which is the result of the non-uniform sensitivity of LOR (lines-of-response) due to their variable pathlength through the detectors and thus detection efficiency. By recalculating the rotational weights incorporating this effect an accurate correction can be achieved without any increase in processing time. This correction does not account for those LOR which exit from the superior and inferior sides of the detectors, the polar angle threshold required for Fourier image reconstruction diminishing the necessity for this component. However, if more oblique LOR were to be incorporated into the backprojection (Defrise et al 1988) a more complete correction may be required.
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