R-Wave Synchronized Blood-Pool Imaging

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Abstract
Three methods for determining the left ventricular ejection fraction (EF) from R-wave synchronized blood-pool images were compared to contrast angiography; the reproducibility of these methods was established in 51 patients. EF was systematically underestimated by the fixed region-of-interest (ROI) method compared to the 2 methods that used varying ROI which track the left ventricular boundary. All methods correlated reasonably well with angiography and were highly reproducible. Use of varying ROI resulted in EF values essentially identical to those determined by angiography. Resolution-recovery image processing appeared to improve reproducibility when varying ROI were used.

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