Document Detail


The active magnetic resonance imaging stent (AMRIS): initial experimental in vivo results with locally amplified MR angiography and flow measurements.
MedLine Citation:
PMID:  11606839     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
RATIONALE AND OBJECTIVES: Magnetic resonance (MR) is limited by artifacts in vessels after stenting. An active MR imaging stent (AMRIS) allows for artifact-free imaging with local improvement in signal-to-noise ratio (SNR). In a rabbit model, we evaluated the imaging properties by MR angiography (MRA) and flow measurements. METHODS: The AMRIS was placed in the abdominal aorta of five rabbits. At 1.5 T, MRA (three-dimensional fast low-angle shot) was performed before and after intravenous injection of an iron oxide-based, blood-pool contrast medium (dose, 50 micromol Fe/kg), and flow measurements were performed (electrocardiographically triggered phase-contrast cine gradient-echo sequence). Mean SNRs were calculated and flow volume curves were generated. RESULTS: The SNR was 6.0 +/- 0.6 (outside the stent) versus 12.3 +/- 1.1 (inside the stent, P < 0.05) for plain MRA, 21.2 +/- 0.6 versus 40.6 +/- 5.2 (P < 0.05) for contrast-enhanced MRA, and 5.4 +/- 0.4 versus 13.7 +/- 2.1 (P < 0.05) for the magnitude images of flow measurements. Flow volume curves within and distal to the stent were comparable. CONCLUSIONS: By using the AMRIS as a vascular stent, the stented vessel segment can be examined with enhanced signal intensity on MRI.
Authors:
D Kivelitz; S Wagner; J Hansel; J Schnorr; R Wetzler; M Busch; A Melzer; M Taupitz; B Hamm
Related Documents :
11548169 - Preliminary evaluation of volume-rendered three-dimensional display of time-of-flight m...
8427109 - Mra delineation of the vertebral-basilar system in patients with hemifacial spasm and t...
21952189 - Degenerative magnetic resonance imaging changes in patients with chronic low back pain:...
22481569 - Biological applications of magnetic nanoparticles.
15134599 - Use of imaging studies in the diagnosis of vasculitis.
19038879 - Diagnostic performance of coronary angiography by 64-row ct.
24902089 - Quantification of white matter fibre pathways disruption in frontal transcortical appro...
21118699 - Behavioral effects on rats of motion within a high static magnetic field.
24288389 - Topographic variation of choroidal and retinal thicknesses at the macula in healthy adu...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Investigative radiology     Volume:  36     ISSN:  0020-9996     ISO Abbreviation:  Invest Radiol     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-10-18     Completed Date:  2001-12-07     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0045377     Medline TA:  Invest Radiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  625-31     Citation Subset:  IM    
Affiliation:
Institut für Radiologie, Charité, Medizinische Fakultät, Humboldt-Universität zu Berlin, Schumannstrasse 20/21, 10098 Berlin, Germnay. dietmar.kivelitz@charite.de
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Aorta, Abdominal / pathology*,  surgery
Artifacts
Blood Flow Velocity
Contrast Media / administration & dosage
Ferric Compounds / diagnostic use
Ferrosoferric Oxide
Injections, Intravenous
Magnetic Resonance Angiography* / methods*
Male
Rabbits
Stents*
Chemical
Reg. No./Substance:
0/Contrast Media; 0/Ferric Compounds; 0/superparamagnetic blood pool agent; 1317-61-9/Ferrosoferric Oxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Extracorporeal photochemotherapy for treatment of acute and chronic GVHD in childhood.
Next Document:  Comparison of gadobenate dimeglumine with gadopentetate dimeglumine for magnetic resonance imaging o...