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One recent development in image reconstruction utilizing time-of-flight information yields a compression of the three dimensional array used in forming the unfiltered "preimage." A reduction from 96 angles to 16 angles is shown to produce equivalent quality images and may form a basis for future architectural strategies. A second development in image reconstruction can strongly affect the quality of results when constraints such as cardiac gating are imposed, while not inherently sacrificing spatial resolution due to inadequate sampling. A correction for sampling density obtained by analyzing list mode data is shown to greatly reduce circular artifact production. This technique is extendable to systems without time-of-flight measurements and to scanning motions other than wobbling.