期刊
RADIOLOGY
卷 226, 期 2, 页码 459-464出版社
RADIOLOGICAL SOC NORTH AMERICA
DOI: 10.1148/radiol.2262011815
关键词
animals; interventional procedures, experimental studies; magnetic resonance (MR), contras media; magnetic resonance (MR), vascular studies; stents and prostheses
资金
- NCI NIH HHS [R01 CA81431-02, R33 CA88144-01] Funding Source: Medline
PURPOSE: To evaluate the feasibility of using the ultrasmall superparamagnetic iron oxide (USPIO) SH U 555 C as an intravascular contrast agent for magnetic resonance (MR) image-guided vascular procedures with an open MR imaging system. MATERIALS AND METHODS: All experiments were performed with MR imaging at 0.2 T. MR image-guided interventions were performed in USPIO-enhanced vessels in four pigs. With near real-time MR image guidance (acquisition time, 0.64 second per section), the splenic and renal arteries were consecutively catheterized by using a susceptibility artifact-based catheter-guide wire combination. Angioplasty and stent implantation were performed four times in the renal artery and twice in the iliac artery. Intraaortal signal intensity (SI) was measured during the interventions. RESULTS: After administration of SH U 555 C (40 mumol of iron per kilogram of body weight), a three-dimensional MR angiographic sequence was performed that allowed visualization of the abdominal and pelvic vessels that were as small as 2 mm in diameter. Catheterization, angioplasty, and stent implantation were successfully guided in the USPIO-enhanced vasculature. Sixty minutes after contrast agent injection, the mean aortic SI was 70% of the maximum measured enhancement levels. CONCLUSION: One intravenous injection of SH U 555 C enabled long, continuous intravascular SI enhancement at MR angiography, and, in combination with susceptibility artifact-based device tracking, the injection allowed the performance of MR imaging-guided intravascular interventions in an open MR imaging system. (C) RSNA, 2002.
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