dc.contributor.author |
Skare, Stefan |
en |
dc.contributor.author |
Newbould, Rexford D |
en |
dc.contributor.author |
Nordell, Anders |
en |
dc.contributor.author |
Holdsworth, Samantha |
en |
dc.contributor.author |
Bammer, Roland |
en |
dc.date.accessioned |
2018-11-13T23:38:01Z |
en |
dc.date.issued |
2008-12 |
en |
dc.identifier.issn |
0740-3194 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/44234 |
en |
dc.description.abstract |
The k-space readout of propeller-type sequences may be accelerated by the use of parallel imaging (PI). For PROPELLER, the main benefits are reduced blurring due to T(2) decay and specific absorption ratio (SAR) reduction, whereas, for EPI-based propeller acquisitions, such as Turbo-PROP and short-axis readout propeller EPI (SAP-EPI), the faster k-space traversal alleviates geometric distortions. In this work, the feasibility of calculating a two-dimensional (2D) GRAPPA kernel on only the undersampled propeller blades themselves is explored, using the matching orthogonal undersampled blade. It is shown that the GRAPPA kernel varies slowly across blades; therefore, an angularly continuous 2D GRAPPA kernel is proposed, in which the angular variation of the weights is parameterized. This new angularly continuous kernel formulation greatly increases the numerical stability of the GRAPPA weight estimation, allowing for generation of fully sampled diagnostic quality images using only the undersampled propeller data. |
en |
dc.format.medium |
Print |
en |
dc.language |
eng |
en |
dc.relation.ispartofseries |
Magnetic resonance in medicine |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.subject |
Brain |
en |
dc.subject |
Humans |
en |
dc.subject |
Image Interpretation, Computer-Assisted |
en |
dc.subject |
Magnetic Resonance Imaging |
en |
dc.subject |
Image Enhancement |
en |
dc.subject |
Calibration |
en |
dc.subject |
Sensitivity and Specificity |
en |
dc.subject |
Reproducibility of Results |
en |
dc.subject |
Phantoms, Imaging |
en |
dc.subject |
Algorithms |
en |
dc.subject |
Pattern Recognition, Automated |
en |
dc.subject |
Adult |
en |
dc.title |
An auto-calibrated, angularly continuous, two-dimensional GRAPPA kernel for propeller trajectories. |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1002/mrm.21788 |
en |
pubs.issue |
6 |
en |
pubs.begin-page |
1457 |
en |
pubs.volume |
60 |
en |
dc.rights.holder |
Copyright: The author |
en |
dc.identifier.pmid |
19025911 |
en |
pubs.end-page |
1465 |
en |
pubs.publication-status |
Published |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Research Support, Non-U.S. Gov't |
en |
pubs.subtype |
research-article |
en |
pubs.subtype |
Journal Article |
en |
pubs.subtype |
Research Support, N.I.H., Extramural |
en |
pubs.elements-id |
683340 |
en |
pubs.org-id |
Medical and Health Sciences |
en |
pubs.org-id |
Medical Sciences |
en |
pubs.org-id |
Anatomy and Medical Imaging |
en |
dc.identifier.eissn |
1522-2594 |
en |
pubs.record-created-at-source-date |
2008-12-01 |
en |
pubs.dimensions-id |
19025911 |
en |