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Figure 4 Bar charts showing the percentage of concordant segments regarding viability between ^99mTc-tetrofosmin SPECT and FDG PET (labeled as Concordance), the percentage of ^99mTc-tetrofosmin defect segments (<50% of peak activity) within viable segments by FDG PET (labeled as TDV) and the percentage of ^99mTc-tetrofosmin uptake segments (50% of peak) within nonviable segments (labeled as TUNV) in the anterior-lateral (A) and inferior-septal regions (B). Data using a 50% threshold cutoff to define viability by FDG PET are illustrated on the left, and those using a 60% threshold cutoff are on the right. Values are calculated on the patient basis, and are expressed as mean ± SD. NC = non–attenuation-corrected image; AC = attenuation corrected image; n = the number of patients who were eligible for the analysis.