| Outcome Measures: |
Primary: the degree of renal artery stenosis, Degree of renal artery stenosis assessed by Magnetic Resonance Imaging and renal angiography, baseline and after intervention|quantitative cortical T2* value, the quantitative T2\* value of the renal cortex will be measured bilaterally at the upper and lower poles by drawing six equal-sized, non-overlapping operator-dependent regions of interest (ROI) to calculate average quantitative T2\* values., baseline and after intervention|change of hemoglobin level, hemoglobin examination of patients before and after examination to evaluate anemia., baseline,72 hours,30 days,3 months|serum creatinine, serum creatinine examination of patients before and after examination to evaluate kidney function., baseline,72 hours,30 days,3 months|Urine routine, Urine routine examination of patients before and after examination to evaluate kidney function., baseline,72 hours,30 days,3 months|24-hour urine biochemistry, 24-hour urine biochemistry examination of patients before and after examination to evaluate kidney function., baseline,72 hours,30 days,3 months|Retinol binding protein, Retinol binding protein examination of patients before and after examination to evaluate kidney function., baseline,72 hours,30 days,3 months|Neutrophil gelatinase-associated lipocalin, Neutrophil gelatinase-associated lipocalin examination of patients before and after examination to evaluate kidney function., baseline,72 hours,30 days,3 months|Serum iron, Determination of serum iron before and after MRA to evaluate the changes of iron content in peripheral blood., baseline,72 hours,30 days,3 months|Ferritin, Determination of serum ferritin before and after MRA to evaluate the changes of iron content in peripheral blood., baseline,72 hours,30 days,3 months|Transferrin, Determination of serum transferrin before and after MRA to evaluate the changes of iron content in peripheral blood., baseline,72 hours,30 days,3 months|serum cystatin C, Determination of serum cystatin C before and after examination to evaluate the changes of renal function., baseline,72 hours,30 days,3 months |
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