Abstract
Aims
To determine the inter-patient variability of apparent diffusion coefficients (ADC) and concurrent micro-circulation contributions from diffusion-weighted MR imaging (DW-MRI) in renal allografts early after transplantation, and to obtain initial information on whether these measures are altered in histologically proven acute allograft rejection (AR).
Methods
DW-MRI was performed in 15 renal allograft recipients 5–19 days after transplantation. Four patients presented with AR and one with acute tubular necrosis (ATN). Total ADC (ADCT) was determined, which includes diffusion and micro-circulation contributions. Furthermore, diffusion and micro-circulation contributions were separated, yielding the “perfusion fraction” (FP), and “perfusion-free” diffusion (ADCD).
Results
Diffusion parameters in the ten allografts with stable function early after transplantation demonstrated low variabilities. Values for ADCT and ADCD were (×10−5 mm2/s) 228 ± 14 and 203 ± 9, respectively, in cortex and 226 ± 16 and 199 ± 9, respectively, in medulla. FP values were 18 ± 5% in cortex and 19 ± 5% in medulla. FP values were strongly reduced to less than 12% in cortex and medulla of renal transplants with AR and ATN. FP values correlated with creatinine clearance.
Conclusion
DW-MRI allows reliable determination of diffusion and micro-circulation contributions in renal allografts shortly after transplantation; deviations in AR indicate potential clinical utility of this method to non-invasively monitor derangements in renal allografts.
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Acknowledgement
This work was supported by the Swiss National Foundation 320000–113512/1 and 320000–111959/1.
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Ute Eisenberger and Harriet C. Thoeny contributed equally to this work.
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Eisenberger, U., Thoeny, H.C., Binser, T. et al. Evaluation of renal allograft function early after transplantation with diffusion-weighted MR imaging. Eur Radiol 20, 1374–1383 (2010). https://doi.org/10.1007/s00330-009-1679-9
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DOI: https://doi.org/10.1007/s00330-009-1679-9