liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Reduction of motion artifacts in carotid MRI using free-induction decay navigators
University of California San Francisco, USA.
Siemens Medical Solutions USA, Inc., San Francisco, California, USA.
Siemens Healthcare Sector IM S AW, Lausanne, Switzerland .
Siemens Healthcare Sector IM S AW, Lausanne, Switzerland .
Show others and affiliations
2014 (English)In: Journal of Magnetic Resonance Imaging, ISSN 1053-1807, E-ISSN 1522-2586, Vol. 40, no 1, 214-220 p.Article in journal (Refereed) Published
Abstract [en]


To develop a framework for prospective free-induction decay (FID)-based navigator gating for suppression of motion artifacts in carotid magnetic resonance imaging (MRI) and to assess its capability in vivo.


An FID-navigator, comprising a spatially selective low flip-angle sinc-pulse followed by an analog-to-digital converter (ADC) readout, was added to a conventional turbo spin-echo (TSE) sequence. Real-time navigator processing delivered accept/reject-and-reacquire decisions to the sequence. In this Institutional Review Board (IRB)-approved study, seven volunteers were scanned with a 2D T2-weighted TSE sequence. A reference scan with volunteers instructed to minimize motion as well as nongated and gated scans with volunteers instructed to perform different motion tasks were performed in each subject. Multiple image quality measures were employed to quantify the effect of gating.


There was no significant difference in lumen-to-wall sharpness (2.3 ± 0.3 vs. 2.3 ± 0.4), contrast-to-noise ratio (CNR) (9.0 ± 2.0 vs. 8.5 ± 2.0), or image quality score (3.1 ± 0.9 vs. 2.6 ± 1.2) between the reference and gated images. For images acquired during motion, all image quality measures were higher (P < 0.05) in the gated compared to nongated images (sharpness: 2.3 ± 0.4 vs. 1.8 ± 0.5, CNR: 8.5 ± 2.0 vs. 7.2 ± 2.0, score: 2.6 ± 1.2 vs. 1.8 ± 1.0).


Artifacts caused by the employed motion tasks deteriorated image quality in the nongated scans. These artifacts were alleviated with the proposed FID-navigator.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014. Vol. 40, no 1, 214-220 p.
Keyword [en]
carotid MRI; motion compensation; FID navigator; motion suppression; carotid artery disease; atherosclerosis
National Category
Medical Engineering
URN: urn:nbn:se:liu:diva-109127DOI: 10.1002/jmri.24389ISI: 000337640700029PubMedID: 24677562OAI: diva2:737532
Available from: 2014-08-13 Created: 2014-08-11 Last updated: 2014-09-17Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Dyverfeldt, Petter
In the same journal
Journal of Magnetic Resonance Imaging
Medical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 34 hits
ReferencesLink to record
Permanent link

Direct link