 |
| Research article summary (published 27 Feb 2009): |
Coronary MR imaging: navigator echo biofeedback increases navigator efficiency--initial experience.
Full Abstract
RATIONALE AND OBJECTIVES: The aim of this study was to investigate whether a respiratory biofeedback system could increase navigator efficiency and maintain image quality compared to conventional respiratory-gated magnetic resonance coronary angiography (MRCA). MATERIALS AND METHODS: Eighteen healthy volunteers underwent MRCA using three different respiratory-gating protocols. A conventional expiratory free-breathing (FB) sequence was compared to two approaches using navigator echo biofeedback (NEB), a midinspiratory approach (NEBin) and an expiratory approach (NEBex). Navigator data reflecting the position of the diaphragm relative to a 3-mm gating window were made available to the subject using a video projector in combination with a Plexiglas screen and mirror goggles. Image quality was graded by two radiologists in consensus using a visual score ranging from 1 (not visible) to 4 (excellent vessel depiction). RESULTS: The NEB approaches improved navigator efficiency (71.1% with NEBex and 68.0% with NEBin vs 42.2% with FB), thus reducing total imaging time. This difference was statistically significant (P(NEBin)=.007; P(NEBex)=.001). Image quality in the NEBex group was comparable to that in the FB group (median score, 2.44 vs 2.52), but it proved to be significantly lower (median score, 1.94 vs 2.52) for the right coronary artery and the left anterior descending coronary artery in the NEBin group. CONCLUSION: NEB maintains image quality and significantly increases navigator efficiency, thereby decreasing total imaging time by about 40% compared to a conventional FB acquisition strategy.
Author information
Author/s: Feuerlein, Sebastian (S); Klass, Oliver (O); Pasquarelli, Alberto (A); Brambs, Hans-Juergen (HJ); Wunderlich, Arthur (A); Duerk, Jeffrey L (JL); Aschoff, Andrik J (AJ); Hoffmann, Martin H K (MH);
Affiliation: Department of Diagnostic and Interventional Radiology, University of Ulm, Steinhoevelstrasse 9, 89075 Ulm, Germany. sfeuerlein(-atsign-)yahoo.com
Journal and publication information
Publication Type: Journal Article; Technical Report
Journal: Academic radiology (Acad Radiol), published in United States. (Language: eng)
Reference: 2009-Mar; vol 16 (issue 3) : pp 374-9
Dates: Created 2009/02/09; Completed 2009/04/15;
PMID: 19201367, status: MEDLINE (last retrieval date: 4/15/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
External Links for this article
(including full text providers, if available):
Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.
This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.
MeSH headings (categories)
This article was linked to the MESH Headings shown below.
Related articles
This article has not been indexed for related articles as yet, however you can still use the live related article search links below.
See a large map of 100+ related articles.