GFR Measurement With Contrast-enhanced Dynamic MRI (IREN)
The aim of the study is to optimize and validate this MR-based GFR measurement in patients with a renal transplant, compared with the reference method, the Cr51- EDTA method: to select the most accurate combination of post-treatment of renal MR images and then evaluate its intra- and inter-rater reliability.
Graft Occlusion, Vascular
Device: Contrast-enhanced dynamic MRI
|Study Design:||Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Diagnostic
|Official Title:||Measurement of Glomerular Filtration Rate With Contrast-enhanced Dynamic MR Imaging in Renal Transplant Recipients: Evaluation of the Agreement With the Cr51 -EDTA Method and of Reproducibility|
- GFR according to MRI and Cr51 measurements on the same day [ Time Frame: The same day ] [ Designated as safety issue: No ]
|Study Start Date:||January 2008|
|Study Completion Date:||March 2013|
|Primary Completion Date:||March 2013 (Final data collection date for primary outcome measure)|
Renal transplant recipients
|Device: Contrast-enhanced dynamic MRI|
Cr51- EDTA method is considered the reference method for measurement of glomerular filtration rate (GFR). However, this method requires several hours and several blood and urinary samplings. Therefore, the ability to get access to this parameter with a simple, valid and reliable method would be a significant progress in clinical follow-up of patients with renal disease. Contrast-enhanced dynamic MRI is now able to give this access to functional parameters as GFR, rapidly and non invasively, becoming an alternative to Cr51-EDTA method. If the acquisition method has been optimized, some problems remain unsolved: is the movement correction worthwhile for the accuracy of the measurement ? Which model provides the most accurate results ? What is the best way to calculate the total GFR (addition of all the voxels or the product of a mean value by the cortical volume)? These questions can be answered only by a comparison with a reference method.
The reference method will be performed after standard hydration, with intravenous injection of 100 µCi of Cr51- EDTA and urinary and blood samplings every 30 minutes during 3h. Dynamic MRI will be performed with fast 3D T1-weighted gradient-echo sequences during 5 minutes after injection of a third of a clinical dose of gadolinium. Post-treatment of images will be done on an off-line program allowing movement correction, conversion of signal intensity into concentration and application of different models. 8 combinations of post-treatment will be tested and compared to the reference method.
|Service d'imagerie Diagnostique et interventionelle de l'adulte, Hôpital Pellegrin, CHU de Bordeaux|
|Bordeaux, France, 33076|
|Study Chair:||PEREZ Paul, Dr||University Hospital, Bordeaux, France|