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  Effects of air susceptibility on proton resonance frequency MR thermometry

Streicher, M., Schäfer, A., Reimer, E., Dhital, B., Trampel, R., Ivanov, D., et al. (2012). Effects of air susceptibility on proton resonance frequency MR thermometry. Magnetic Resonance Materials in Physics, Biology and Medicine, 25(1), 41-47. doi:10.1007/s10334-011-0249-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-59BB-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CE2B-6
Genre: Journal Article

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Streicher_2012_Effects.pdf (Publisher version), 524KB
 
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 Creators:
Streicher, Markus1, Author              
Schäfer, Andreas1, Author              
Reimer, Enrico1, Author              
Dhital, Bibek1, Author              
Trampel, Robert1, Author              
Ivanov, Dimo1, Author              
Turner, Robert1, Author              
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1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              

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Free keywords: Air; Susceptibility; Temperature; PRF; PRFS-based MR thermometry
 Abstract: The temperature dependence of the proton resonance frequency (PRF) is often used in MR thermometry. However, this method is prone to even very small changes in local magnetic field strength. Here, we report on the effects of susceptibility changes of surrounding air on the magnetic field inside an object and their inferred effect on the measured MR temperature. Materials and methods MR phase thermometry was performed on spherical agar phantoms enclosed in cylindrical containers at 7 T. The air susceptibility inside the cylindrical container was changed by both heating the air and changing the gas composition. Results Changing the temperature of surrounding air from 23 to 69°C caused an apparent MR temperature error of 2 K. When ambient air was displaced by 100% oxygen, the MR temperature error increased to 40 K. The magnetic field shift and therefore error in inferred MR temperature scales linearly with volume susceptibility change and has a strong and nontrivial dependence on the experimental configuration. Conclusion Air susceptibility changes associated with oxygen concentration changes greatly affect PRF MR thermometry measurements. Air temperature changes can also affect these measurements, but to a smaller degree. For uncalibrated MR thermometry, air susceptibility changes may be a significant source of error.

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Language(s): eng - English
 Dates: 2011-02-112010-12-102011-03-082011-04-102012-02-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s10334-011-0249-8
Other: Epub 2011
PMID: 21479876
 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 (1) Sequence Number: - Start / End Page: 41 - 47 Identifier: ISSN: 0968-5243
CoNE: https://pure.mpg.de/cone/journals/resource/954926245532