Purpose: To compare the diagnostic performance of estimated energy loss\n(EEL) calculated using a simplified Bernoulli formula at coronary computed\ntomography (CT) and single photon emission computed tomography\n(SPECT) to diagnose ischemia-causing stenosis by invasive fractional flow reserve\n(FFR). Methods: We retrospectively included 43 patients who underwent\ncoronary CT, SPECT, and FFR measurement by catheter within 3\nmonths. When an intermediate stenosis (40% - 70%) was present at CT, EEL\nwas calculated using the following parameters: lesion length, diameter stenosis,\nminimal lumen area, and the myocardial volume. An EEL > 1.17 or diameter\nstenosis > 70% was determined ischemic. Stress-induced ischemia by\nSPECT was determined when a perfusion defect at stress was accompanied\nwith a fill-in at rest....................
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