title: [Catheter visualization in MR-tomography: initial experimental results with field-inhomogeneity catheters].
abstract: OBJECTIVE
  To assess the feasibility of a new developed field inhomogeneity catheter for interventional MR imaging in vivo.
  
  
  METHODS
  Three different prototypes of a field inhomogeneity catheter were investigated in 6 pigs. The catheters were introduced in Seldinger technique via the femoral vessels over a guide wire on an interventional MR system (Philips Gyroscan NT combined with a C-arm fluoroscopy unit [Philips BV 212]). Catheters were placed in veins and arteries. The catheter position was controlled by a fast gradient echo sequence (Turbo Field Echo [TEE]).
  
  
  RESULTS
  Catheters were introduced over a guide wire without complications in all cases. Using the field inhomogeneity concept, catheters were easily visualised in the inferior vena cava and the aorta by the fast gradient echo technique on MR in all cases. Although aortic branches were successfully cannulated, the catheters were not displayed by the TFE technique due to the complex and tortuous anatomy. All animals survived the experiments without complications.
  
  
  CONCLUSIONS
  MR guided visualization of a field inhomogeneity catheter is a simple concept which can be realised on each MR scanner and may allow intravascular MR guided interventions in future.
authors.affiliation: Klinik für Radiologische Diagnostik, RWTH Aachen.
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.forename: A
authors.initials: A
authors.lastname: Glowinski
authors.forename: J
authors.initials: J
authors.lastname: Neuerburg
authors.forename: A
authors.initials: A
authors.lastname: Bücker
authors.forename: J J
authors.initials: JJ
authors.lastname: van Vaals
authors.forename: W
authors.initials: W
authors.lastname: Hurtak
authors.forename: R W
authors.initials: RW
authors.lastname: Günther
mesh_terms: D000818:Animals; D001011:Aorta; D002406:Catheterization, Peripheral / Q000295:instrumentation*; D002408:Catheters, Indwelling; D005240:Feasibility Studies; D018810:Magnetic Resonance Angiography / Q000379:methods*; D013552:Swine; D014682:Vena Cava, Inferior