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Optimization of Analog-Circuit Motion Correction for Liver Scintigraphy

The Ontario Cancer Institute, Toronto, Canada

Correspondence: For reprints contact: M. J. Bronskill, Physics Div., Ontario Cancer Inst., 500 Sherbourne St., Toronto, Canada, M4X 1K9.

ABSTRACT

Respiratory motion customarily degrades the resolution of a routine hepatic scintigram. We have analyzed four analog motion-correction methods 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 view 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.