MR imaging-guided percutaneous angioplasty and stent placement in a swine model comparison of open- and closed-bore scanners.
OBJECTIVE
The purpose of this study is to compare the feasibility and precision of renal artery angioplasty and stent placement using two different MR scanners.


METHODS
MR imaging-guided angioplasty and stent placements were performed on seven pigs using 0.2 and 1.5 T scanners (Magnetom Open and Magnetom Sonata, Siemens Medical Solutions, Erlangen, Germany). For guidance of catheters, guide wires and stents susceptibility artifact-based tracking was used. The end point of each intervention was to position a stent in the renal artery with its proximal end at the level of the aortic wall. Procedure time and stent position were evaluated.


RESULTS
Catheterization, angioplasty, and stent placement were feasible using MRI guidance at both 0.2 and 1,5 Tesla. At 1.5 T all catheter manipulations and interventions were performed in less than 30 minutes. At 0.2 T the interventions took up to 90 minutes. No significant difference in the stent deviation was noted between the two scanners.


CONCLUSIONS
The use of a high-performance 1.5 T scanner helped to reduce the procedure time to half of that of a low-field system. Since no difference in stent placement precision was noted, a dedicated MR-stent might be mandatory for more precise stent placement.
Wacker
Frank K
FK
Department of Radiology, Charité-Campus Benjamin Franklin, Hindenburgdamm 30 12200 Berlin Germany. wackerfrank@web.de
Hillenbrand
Claudia
C
Elgort
Daniel R
DR
Zhang
Shaoxiong
S
Duerk
Jeffrey L
JL
Lewin
Jonathan S
JS
D000800:Angioplasty, Balloon; D000818:Animals; D003287:Contrast Media; D005240:Feasibility Studies; D008279:Magnetic Resonance Imaging / Q000379:methods*; D012078:Renal Artery Obstruction / Q000628:therapy*; D015607:Stents; D013552:Swine
D003287:Contrast Media