Multiparametric MRI for Assessment of Changes of Renal Hemodynamics After Fistula Closure in Kidney Transplant Patients

Inclusion Criteria: * Written informed consent * Age \> 18 years * Patients wishing to close the fistula and planned for surgical fistula closure * eGFR CKD EPI ≥ 45 ml/min/1.73m2 at one year post transplantation * Stable eGFR within the past 6 months * Controlled blood pressure Exclusion Criteria: * Kidney Transplantation \< 12 months before fistula closure * Proteinuria \> 500mg/d * Presence of donor specific antibodies * Rejection within the past 6 months * BK virus replication within the past 3 months * Cardiac pacemaker, which is not compatible with MRI * Claustrophobia