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  An embedded optical tracking system for motion-corrected magnetic resonance imaging at 7T

Schulz, J., Siegert, T., Reimer, E., Labadie, C., Maclaren, J., Herbst, M., et al. (2012). An embedded optical tracking system for motion-corrected magnetic resonance imaging at 7T. Magnetic Resonance Materials in Physics, Biology and Medicine, 25(6), 443-453. doi:10.1007/s10334-012-0320-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-A555-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-5C57-4
Genre: Journal Article

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 Creators:
Schulz, Jessica1, Author              
Siegert, Thomas1, Author              
Reimer, Enrico1, Author              
Labadie, Christian2, Author              
Maclaren, Julian3, Author
Herbst, Michael4, Author
Zaitsev, Maxim4, Author
Turner, Robert1, Author              
Affiliations:
1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              
2Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634558              
3Department of Radiology, Stanford University, CA, USA, ou_persistent22              
4Department of Radiology, University Medical Center, Freiburg, Germany, ou_persistent22              

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Free keywords: Embedded system; Optical motion tracking; Magnetic resonance imaging; Prospective motion correction
 Abstract: OBJECT: Prospective motion correction using data from optical tracking systems has been previously shown to reduce motion artifacts in MR imaging of the head. We evaluate a novel optical embedded tracking system. MATERIALS AND METHODS: The home-built optical embedded tracking system performs image processing within a 7 T scanner bore, enabling high speed tracking. Corrected and uncorrected in vivo MR volumes are acquired interleaved using a modified 3D FLASH sequence, and their image quality is assessed and compared. RESULTS: The latency between motion and correction of the slice position was measured to be (19 ± 5) ms, and the tracking noise has a standard deviation no greater than 10 μm/0.005° during conventional MR scanning. Prospective motion correction improved the edge strength by 16 % on average, even though the volunteers were asked to remain motionless during the acquisitions. CONCLUSION: Using a novel method for validating the effectiveness of in vivo prospective motion correction, we have demonstrated that prospective motion correction using motion data from the embedded tracking system considerably improved image quality. Prospective motion correction using data from optical tracking systems has been previously shown to reduce motion artifacts in MR imaging of the head. We evaluate a novel optical embedded tracking system. Materials and methods The home-built optical embedded tracking system performs image processing within a 7T scanner bore, enabling high speed tracking. Corrected and uncorrected in vivo MR volumes are acquired interleaved using a modified 3D FLASH sequence, and their image quality is assessed and compared. Results The latency between motion and correction of the slice position was measured to be (19 ± 5) ms, and the tracking noise has a standard deviation no greater than 10 μm/0.005° during conventional MR scanning. Prospective motion correction improved the edge strength by 16 % on average, even though the volunteers were asked to remain motionless during the acquisitions. Conclusion Using a novel method for validating the effectiveness of in vivo prospective motion correction, we have demonstrated that prospective motion correction using motion data from the embedded tracking system considerably improved image quality.

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Language(s): eng - English
 Dates: 2012-06-132012-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s10334-012-0320-0
PMID: 22695771
Other: Epub 2012
 Degree: -

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Title: Magnetic Resonance Materials in Physics, Biology and Medicine
Source Genre: Journal
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Publ. Info: Amsterdam
Pages: - Volume / Issue: 25 (6) Sequence Number: - Start / End Page: 443 - 453 Identifier: ISSN: 0968-5243
CoNE: https://pure.mpg.de/cone/journals/resource/954926245532