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FIGURE 5. Polar maps of patient scans of Figure 3 using attenuation data from unenhanced CT scan (A), nonprocessed contrast-enhanced CT scan (B), contrast-enhanced CT scan with cylinder-threshold correction (C), and contrast-enhanced CT scan with global-threshold correction (D). Uptake in left ventricle is overestimated when using nonprocessed contrast-enhanced CT attenuation data. ant = anterior; lat = lateral; post = posterior; sep = septal.

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