Respiratory motion customarily degrades the resolution of a routine hepatic scintigram. We have analysed four analog motion-correction meth ods and have measured their abilities to maintain good spatial resolution over a broad range of liver scintigraphy parameters. The analog circuit described can maintain the spatial resolution of the scintillation camera within 2 mm of the full width at half maximum of the stationary point-spread function. Experiments show that clinicians require about 50% greater film-density contrast to detect a 2-cm-diam. lesion if motion correction is not used. In 14 % of the cases studied, the addition of a motion-corrected anterior viete to the usual four-view liver study (performed without motion correction) resulted in a changed clinical interpretation. We conclude that analog motion correction should be provided in all scintillation cameras used for liver scintigraphy. 3 NucÃMetÃ19: 1059-1066, 1978 As the spatial resolution of scintillation cameras continues to improve, respiratory motion presents a limitation of increasing importance to liver scin tigraphy. The techniques that have been employed to reduce the degradation of spatial resolution due to respiratory motion can be divided into three cate gories
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