RESUMEN
Objective To compare the accuracy of dynamic contrast-enhanced magnetic resonance (DCE-MRI) and SPECT in the measurement of glomerular filtration rate (GFR) in renal allografts.Methods Sixty renal transplant recipients were enrolled in this study.DCE-MRI and SPECT were used to measure the GFR of the transplanted kidneys,and compared with the endogenous creatinine clearance rate (Ccr).Bias,precision,correlation and Bland-Altman agreement were calculated for each modality compared with the endogenous Ccr.Results In 60 renal transplant recipients,the corrected Ccr was (60.63 ± 24.83) ml · min-1 · 1.73 m-2.The GFR measured by SPECT was (65.31 ± 17.08) ml · min-1 · 1.73 m-2,and (50.44 ± 22.78) ml · min-1 · 1.73 m-2 by MRI,respectively.The bias of GFR-SPECT was 4.69 ml·min-1 · 1.73 m-2,and the precision was 23.76 ml·min-1 1.73 m-2.The bias of GFR-MRI was-10.18 ml·min-1 ·1.73 m-2,and the precision was 13.87 ml·min-1 · 1.73 m-2.Correlation analysis showed that GFR-MRI and the endogenous Ccr had a good correlation (r=0.833,P＜0.01),GFR-SPECT and the endogenous Ccr had a moderate correlation (r=0.406,P＜0.01),and GFR-MRI and GFR-MRI had a poor correlation (r=0.342,P ＜0.01).Bland-Altman analysis showed a confidence interval of 95.3 ml·min-1 ·1.73 m-2 for GFR-SPECT and 62.3 ml· min-1 · 1.73 m-2 for GFR-MRI.Conclusion DCE-MRI can be used as confidently as SPECT to evaluate the renal function of transplanted kidneys in the same time of determining anatomical information.