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Correlations between the GFR measured with Cr-51 EDTA testing and SPECT/CT %ID (n = 18 patients). Eight healthy young volunteers and ten older volunteers were analyzed to determine the correlation between Cr-51 EDTA GFR and SPECT/CT %ID. A significant correlation was observed (r = 0.7906, p = 0.0001). The Cr-51 EDTA GFR could be estimated using the following equation: GFR (ml/min) = (%ID × 9.1462) + 23.0653
