Renal Perfusion Assessment in the Endovascular Treatment of Renal Artery Stenosis

Inclusion Criteria: * patients who provided informed consent * patients who were diagnosed with RAS by CTA, MRA, or Doppler ultrasonography * patients who were aged 18 years or older * patients whose intervened renal arteries were not completely occluded (confirmed by DSA) * the stenosis percentage exceeding 70% * patients who had uncontrolled blood pressure or impaired renal function * paitents whose affected kidney did not have total loss of function Exclusion Criteria: * were pregnant * had a history of renal transplantation or renal artery bypass surgery * were allergic to iodine contrast medium * had other contraindications of endovascular treatment * contraindications of MRI examinations * had technical failure in the endovascular treatment.