Optimizing spherical navigator echoes for three-dimensional rigid-body motion detection

Spherical navigator (SNAV) echoes show promise in correcting for three‐dimensional rigid‐body motion. In this paper, several important parameters in the design and performance of the SNAV technique are discussed, including a novel sampling strategy, the optimal k‐space radius and sampling density of...

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Veröffentlicht in:Magnetic resonance in medicine Jg. 53; H. 5; S. 1080 - 1087
Hauptverfasser: Petrie, Daniel W., Costa, Andreu F., Takahashi, Atsushi, Yen, Yi-Fen, Drangova, Maria
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.05.2005
Schlagworte:
Algorithms
Imaging, Three-Dimensional
k-space
Magnetic Resonance Imaging - methods
Motion
motion correction
optimization
Phantoms, Imaging
pulse sequence design
Rotation
spherical navigator echo
ISSN:0740-3194, 1522-2594
Online-Zugang:Volltext
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Zusammenfassung:Spherical navigator (SNAV) echoes show promise in correcting for three‐dimensional rigid‐body motion. In this paper, several important parameters in the design and performance of the SNAV technique are discussed, including a novel sampling strategy, the optimal k‐space radius and sampling density of the navigator, and the execution of the SNAV trajectory by the scanner hardware. A variable‐sampling density (VSD) helical‐spiral SNAV trajectory, which can acquire data on the entire spherical shell without exceeding the maximum slew rate of the scanner, is presented. To ensure that the VSD SNAV trajectory was properly executed by the scanner hardware, the gradient waveforms were verified using a self‐encoding technique. The ability of the VSD SNAV to measure rotational and translational motion was studied with in vitro experiments at various k‐space radii and sampling densities. The results of this study show that the best accuracy was attained at k‐space radii of 1.4 and 1.6 cm−1, with 2400 to 4000 samples acquired over the sphere. Magn Reson Med 53:1080–1087, 2005. © 2005 Wiley‐Liss, Inc.
Bibliographie:Natural Sciences and Engineering Research Council of Canada
istex:27424F3BAF3E5A5905DF98E171BA8680001277E2
ArticleID:MRM20445
Ontario Research and Development Challenge Fund
ark:/67375/WNG-MX0V54SH-0
Canadian Institutes of Health Research - No. MGP-49536
Whitaker Foundation - No. RG-00-0409
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ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.20445