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Figure 2 Comparison of Voltage Map With Positron Emission Tomography/Computed Tomography

(A) A 3-dimensional voltage map of the left ventricle in different projections. Endocardial voltage is displayed color-coded according to scale. Myocardial scar is shown in red representing voltage of >0.5 mV and appears to extend to the mitral valve (white arrow). (B) Corresponding projections of metabolic 3-dimensional positron emission tomographic metabolic map. A color-coded scale with decreasing metabolic activity from healthy myocardium (orange) to scar (green) demonstrates good correlation with apical-septal-lateral scar defined by voltage mapping. However, a metabolically active area is found at the inferior base (orange-purple area indicated by white arrow), which was not detected with the use of voltage maps and could represent potential ventricular tachycardia channels. Corresponding contrast-enhanced computed tomography demonstrates homogeneous wall thinning along the inferior wall (C, white arrow).