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Figure 3 The upper panels demonstrate a contrast-enhanced apical four-chamber echocardiographic image at rest (left) alongside its corresponding parametric (middle), and single-photon emission computed tomography (SPECT) image (right). The bottom panels demonstrate a contrast-enhanced apical four-chamber echocardiographic image at peak stress (left) alongside its corresponding parametric (middle), and SPECT image (right). The parametric image has been color-coded: red indicates a moderate to severe perfusion deficit; yellow indicates a mild deficit; and green indicates normal perfusion. A stress-induced perfusion defect has developed in the apical segments (arrows), with apical thinning. The basal lateral segment on the parametric image was classified as nonanalyzable, using the goodness-of-fit image.