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Figure 1 Polar plot and segmentation of the LV for positron emission computed tomography (PET)/single photon emission computed tomography (SPECT) and mapping analysis. The segmentation methods for both modalities are described in detail in the Methods section. Positron emission computed tomography/SPECT regions (n = 25) were grouped (see numbers), and mean values were calculated and assigned (same numbers for corresponding regions) to the mapping regions (n = 12).