title: MRI after implantation of a novel femoral closure device following intra-arterial catheterisation: implications for subsequent contrast-enhanced MR angiography.
abstract: OBJECTIVE
  To assess MRI safety aspects and artefacts of a novel femoral artery closure device during contrast-enhanced MR angiography in patients following intra-arterial catheterisation.
  
  
  METHODS
  Ten consecutive patients underwent MRI within 24 h of coronary angiography and placement of a femoral artery closure device. We used a T2-weighted gradient-echo MRI sequence to measure the device-related artefact size in comparison with a phantom image, phase-contrast flow measurement proximal to, at the level of and distal to the device to quantify potential differences in flow velocity and contrast-enhanced 3D gradient-echo MR angiography to differentiate potential femoral artery stenosis from device-related artefacts.
  
  
  RESULTS
  The mean size of the oval-shaped artefact was 8.4 x 6.6 mm (+/-1.0 x 0.8 mm) and was almost identical to the maximum artefact size of the phantom measurement (8.3 x 5.7 mm). Device placement did not result in an increased peak velocity (proximal 69 +/- 23 cm/s, at the level of 64 +/- 11 cm/s and distal to the device 63 +/- 12 cm/s, p = 0.67). The mean artefact penetration into the vessel lumen was 0.5 +/- 0.5 mm (percentage vessel narrowing 7.0 +/- 6%; range 0-16%).
  
  
  CONCLUSIONS
  The MR conditional StarClose femoral artery closure device was used safely within 24 h of deployment at 1.5 T. Despite clip-related artefacts MR angiography will allow for easy differentiation of clip-related artefacts from high-grade atherosclerotic stenosis.
authors: Department of Diagnostic and Interventional Radiology, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany. mohrs@radiologie-darmstadt.de
authors: Oliver K
authors: OK
authors: Mohrs
authors: Steffen E
authors: SE
authors: Petersen
authors: Bernd
authors: B
authors: Nowak
authors: Hans-Ulrich
authors: HU
authors: Kauczor
authors: Thomas
authors: T
authors: Voigtlaender
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D001783:Blood Flow Velocity; D003287:Contrast Media; D017023:Coronary Angiography; D003327:Coronary Disease / Q000175:diagnosis; D004562:Electrocardiography; D005260:Female; D005263:Femoral Artery / Q000601:surgery*; D019786:Gadolinium DTPA; D006488:Hemostasis, Surgical / Q000295:instrumentation*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D016014:Linear Models; D018810:Magnetic Resonance Angiography / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D014654:Vascular Patency
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA