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  Fast accurate MR thermometry using phase referenced asymmetric spin-echo EPI at high field

Streicher, M., Schäfer, A., Ivanov, D., Müller, D. K., Amadon, A., Reimer, E., et al. (2014). Fast accurate MR thermometry using phase referenced asymmetric spin-echo EPI at high field. Magnetic Resonance in Medicine, 71(2), 524-533. doi:10.1002/mrm.24681.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-7DE9-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-7F0D-2
Genre: Journal Article

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Streicher_2013_Fast.pdf (Preprint), 636KB
 
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 Creators:
Streicher, Markus1, Author              
Schäfer, Andreas1, Author              
Ivanov, Dimo1, Author              
Müller, Dirk K.2, Author              
Amadon, Alexis3, Author
Reimer, Enrico1, Author              
Huber, Laurentius1, Author              
Dhital, Bibek1, Author              
Rivera, Deborah1, Author              
Kögler, Carsten1, Author              
Trampel, Robert1, Author              
Pampel, André2, 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              
3Neurospin, French Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette, France, ou_persistent22              

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Free keywords: Referenced; MR thermometry; Fat; Spin-echo; Asymmetric; Proton resonance frequency shift
 Abstract: Purpose: A novel highly accurate method for MR thermometry, effective at high field, is introduced and validated, which corrects for slow and fast field fluctuations by means of reference images. Methods: An asymmetric spin-echo (ASE) EPI sequence was made frequency-selective to water or a reference substance by controlling the slice-select gradient polarity, or the durations of the excitation and refocusing RF pulses. Images were acquired pairwise, and the temperature-sensitive water images were corrected for field fluctuations using the reference images. In a phantom RF heating experiment, dissolved dimethyl sulfoxide was used as a reference substance. Temperature stability was tested in-vivo on the human brain, referenced using subcutaneous scalp fat. Water and fat phase images were acquired only 50 ms apart. Bloch simulations validated the frequency selection accuracy. Results: ASE imaging using simple frequency selection methods provides highly accurate referenced MR thermometry in phantoms and in-vivo at 7 Tesla. Effects of field fluctuations caused by field drift, breathing and heart beat were corrected. The technique is highly robust against B1 inhomogeneities. Conclusion: Frequency selection using gradient-reversal can enable fast accurate referenced in-vivo MR thermometry, assisting thermal characterization of RF coils and possibly in-vivo SAR monitoring.

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Language(s): eng - English
 Dates: 2012-11-272012-08-312013-01-152013-02-252014-02
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.24681
PMID: 23440917
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 71 (2) Sequence Number: - Start / End Page: 524 - 533 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149