title: MR imaging-guided stent placement in iliac arterial stenoses: a feasibility study.
abstract: OBJECTIVE
  To assess the feasibility of magnetic resonance (MR) imaging-guided stent placement in iliac arterial stenoses.
  
  
  METHODS
  Thirteen patients with 14 iliac arterial stenoses were examined prospectively. Angioplasty was performed through a femoral sheath by using a conventional 1.5-T MR imaging system. Stents and catheters were visualized on the basis of their artifacts. Nitinol stents were placed with gradient-echo MR imaging guidance. Angioplasty balloons were inflated with gadolinium-based contrast material. Results were evaluated clinically and with both digital subtraction angiography (DSA) and contrast material-enhanced MR angiography.
  
  
  RESULTS
  Ten of 13 patients were treated with technical success by using MR imaging-guided intervention alone. Three patients were treated with additional fluoroscopic guidance, because complications (ie, panic attack, subintimal recanalization, and stent misplacement) occurred with MR guidance. The quality of the postinterventional contrast-enhanced MR angiograms of three of 12 lesions with stents was limited owing to stent-induced signal loss of the lumen. The mean stenosis degree after stent placement was significantly higher at contrast-enhanced MR angiography than at DSA (24.6% vs 6.2%). The mean MR imaging-guided procedure time was 74 minutes.
  
  
  CONCLUSIONS
  MR imaging-guided stent placement in iliac arteries is feasible in select patients. The presented technique has limitations-that is, long procedure times, lack of real-time monitoring, and stent artifacts-that necessitate further modifications before it can be recommended for clinical use.
authors.affiliation: Department of Radiology, University of Regensburg, Klinikum der Universität, Franz-Josef-Strauss-Allee 11, D-93042 Regensburg, Germany. chmanke@web.de
authors.forename: C
authors.initials: C
authors.lastname: Manke
authors.forename: W R
authors.initials: WR
authors.lastname: Nitz
authors.forename: B
authors.initials: B
authors.lastname: Djavidani
authors.forename: M
authors.initials: M
authors.lastname: Strotzer
authors.forename: M
authors.initials: M
authors.lastname: Lenhart
authors.forename: M
authors.initials: M
authors.lastname: Völk
authors.forename: S
authors.initials: S
authors.lastname: Feuerbach
authors.forename: J
authors.initials: J
authors.lastname: Link
mesh_terms: D000368:Aged; D015901:Angiography, Digital Subtraction; D000800:Angioplasty, Balloon; D001157:Arterial Occlusive Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000628:therapy; D003287:Contrast Media; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007083:Iliac Artery / Q000000981:diagnostic imaging / Q000473:pathology; D018810:Magnetic Resonance Angiography; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015607:Stents
chemical_list: D003287:Contrast Media