Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 75, Issue 3, Pages 1030-+Publisher
WILEY
DOI: 10.1002/mrm.25670
Keywords
retrospective motion correction; navigators; FatNavs
Funding
- Centre d'Imagerie BioMedicale (CIBM) of the UNIL
- UNIGE
- HUG
- CHUV
- EPFL
- Leenaards Foundation
- Jeantet Foundation
- Swiss National Science Foundation [205321_153564]
- Swiss National Science Foundation (SNF) [205321_153564] Funding Source: Swiss National Science Foundation (SNF)
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PurposeThe goal of the present study was to use a three-dimensional (3D) gradient echo volume in combination with a fat-selective excitation as a 3D motion navigator (3D FatNav) for retrospective correction of microscopic head motion during high-resolution 3D structural scans of extended duration. The fat excitation leads to a 3D image that is itself sparse, allowing high parallel imaging acceleration factors - with the additional advantage of a minimal disturbance of the water signal used for the host sequence. MethodsA 3D FatNav was inserted into two structural protocols: an inversion-prepared gradient echo at 0.33x0.33x 1.00mm resolution and a turbo spin echo at 600 m isotropic resolution. ResultsMotion estimation was possible with high precision, allowing retrospective motion correction to yield clear improvements in image quality, especially in the conspicuity of very small blood vessels. ConclusionThe highly accelerated 3D FatNav allowed motion correction with noticeable improvements in image quality, even for head motion which was small compared with the voxel dimensions of the host sequence. Magn Reson Med 75:1030-1039, 2016. (c) 2015 Wiley Periodicals, Inc.
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