title: [Time-resolved MR angiography of the renal artery: morphology and perfusion].
abstract: OBJECTIVE
  To prove the hypothesis that renal artery stenosis and changes in renal perfusion can be detected with contrast-enhanced time-resolved MR angiography in a single examination.
  
  
  METHODS
  In 71 patients, 137 renal arteries and 14 accessory renal arteries were studied. The examinations were performed on a 1.5 T system. A T 1 -weighted gradient echo sequence with a temporal resolution of 7 s was used. Single dose of contrast material (0.1 mmol/kg Gd-DTPA) was injected with a power injector with a flow rate of 2 ml/s. Criterion for the assessment of renal perfusion was the slope ratio of the signal intensity time curve in both kidneys.
  
  
  RESULTS
  Forty renal artery stenoses and one occlusion of a renal artery were detected. In 48 kidneys (35 %) segmental arteries were evaluated. The accuracy of the slope ratio (limit value 0.75) concerning the detection of unilateral renal artery stenosis was 92.6 % (sensitivity 75 %, specificity 95.7 %).
  
  
  CONCLUSIONS
  Time-resolved MR angiography can detect changes in renal perfusion in patients with unilateral renal artery stenosis.
authors.affiliation: Institut für Röntgendiagnostik der Universität Würzburg. krause@mail.uni-wuerzburg.de
authors.forename: U J
authors.initials: UJ
authors.lastname: Krause
authors.forename: T
authors.initials: T
authors.lastname: Pabst
authors.forename: H
authors.initials: H
authors.lastname: Köstler
authors.forename: C
authors.initials: C
authors.lastname: Helbig
authors.forename: W
authors.initials: W
authors.lastname: Kenn
authors.forename: D
authors.initials: D
authors.lastname: Hahn
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007511:Ischemia / Q000175:diagnosis; D007668:Kidney / Q000098:blood supply*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012039:Regional Blood Flow / Q000502:physiology; D012077:Renal Artery / Q000473:pathology; D012078:Renal Artery Obstruction / Q000175:diagnosis*
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA