Document Detail


Resolution improvement in thick-slab magnetic resonance digital subtraction angiography using SENSE at 3T.
MedLine Citation:
PMID:  15390145     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To evaluate the use of parallel imaging (sensitivity encoding [SENSE]) to improve spatial resolution and achieve sub-second temporal resolution in fluoroscopic contrast-enhanced, magnetic resonance digital subtraction angiography (MR-DSA). MATERIALS AND METHODS: A MR-DSA sequence was optimized on a 3-T scanner with respect to sampling bandwidth and SENSE acceleration factor subject to the constraints of half-second acquisition time and 0.6 x 1.2 mm in-plane resolution. MR-DSA with and without SENSE acceleration was then evaluated in patients with arterio-venous malformations (AVMs). RESULTS: Consistent with previously reported results and theory, SENSE factors greater than two and increasing sampling bandwidth both led to increasing image noise. Compared to lower resolution MR-DSA images with similar temporal resolution, the SENSE accelerated sequence provided better spatial resolution without notable changes in the contrast enhancement of the vascular territories of the AVMs but was hampered somewhat in the late venous phases by a reconstruction artifact. CONCLUSION: SENSE acceleration of MR-DSA by a factor of two allows improved temporal or spatial resolution without significant loss of image quality. Signal-to-noise degradation associated with higher SENSE acceleration factors are likely to necessitate other approaches to further improving resolution in MR-DSA. Clinically, SENSE accelerated MR-DSA improves the non-invasive pre- and postoperative depiction of AVM flow dynamics.
Authors:
Paul E Summers; Spyros S Kollias; Anton Valavanis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of magnetic resonance imaging : JMRI     Volume:  20     ISSN:  1053-1807     ISO Abbreviation:  J Magn Reson Imaging     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-09-29     Completed Date:  2005-02-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9105850     Medline TA:  J Magn Reson Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  662-73     Citation Subset:  IM    
Copyright Information:
Copyright 2004 Wiley-Liss, Inc.
Affiliation:
Institute of Neuroradiology, University Hospital Zurich, Zurich, Switzerland. paul.summers@usz.ch
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Angiography, Digital Subtraction / methods*
Arteriovenous Malformations / diagnosis*,  radiography
Contrast Media
Female
Fluoroscopy
Humans
Image Enhancement / methods*
Magnetic Resonance Angiography / methods*
Male
Middle Aged
Chemical
Reg. No./Substance:
0/Contrast Media

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


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