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Figure 2 Relationship between transmual extent of scar (TES) and thallium (Tl) activity at late redistribution (left) and increase in wall motion score (WMS) with low-dose dobutamine (right). Thallium activity at redistribution and the degree of low-dose augmentation both decrease significantly with increasing TES (p < 0.001), with no significant difference between dobutamine echocardiography and Tl-single-photon emission computed tomography. The 60% Tl activity cut-off for viability is shown.