Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 72, Issue 4, Pages 971-985Publisher
WILEY-BLACKWELL
DOI: 10.1002/mrm.25001
Keywords
prospective rigid body motion correction; inductively coupled probes; wireless NMR markers
Funding
- NCATS NIH HHS [UL1 TR000445] Funding Source: Medline
- NCRR NIH HHS [UL1 RR024975] Funding Source: Medline
- NIBIB NIH HHS [R01 EB000461] Funding Source: Medline
Ask authors/readers for more resources
PurposeHead motion continues to be a major source of artifacts and data quality degradation in MRI. The goal of this work was to develop and demonstrate a novel technique for prospective, 6 degrees of freedom (6DOF) rigid body motion estimation and real-time motion correction using inductively coupled wireless nuclear magnetic resonance (NMR) probe markers. MethodsThree wireless probes that are inductively coupled with the scanner's RF setup serve as fiducials on the subject's head. A 12-ms linear navigator module is interleaved with the imaging sequence for head position estimation, and scan geometry is updated in real time for motion compensation. Flip angle amplification in the markers allows the use of extremely small navigator flip angles (approximate to 1 degrees). A novel algorithm is presented to identify marker positions in the absence of marker specific receive channels. Motion correction is demonstrated in high resolution 2D and 3D gradient recalled echo experiments in a phantom and humans. ResultsSignificant improvement of image quality is demonstrated in phantoms and human volunteers under different motion conditions. ConclusionA novel real-time 6DOF head motion correction technique based on wireless NMR probes is demonstrated in high resolution imaging at 7 Tesla. Magn Reson Med 72:971-985, 2014. (c) 2013 Wiley Periodicals, Inc.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available