Comparison of two fiber-optical temperature measurement systems in magnetic fields up to 9.4 Tesla.

Buchenberg, Waltraud B; Dadakova, Tetiana; Groebner, Jens; Bock, Michael; Jung, Bernd (2014). Comparison of two fiber-optical temperature measurement systems in magnetic fields up to 9.4 Tesla. Magnetic resonance in medicine, 73(5), pp. 2047-2051. Wiley-Liss 10.1002/mrm.25314

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PURPOSE Precise temperature measurements in the magnetic field are indispensable for MR safety studies and for temperature calibration during MR-guided thermotherapy. In this work, the interference of two commonly used fiber-optical temperature measurement systems with the static magnetic field B0 was determined. METHODS Two fiber-optical temperature measurement systems, a GaAs-semiconductor and a phosphorescent phosphor ceramic, were compared for temperature measurements in B0 . The probes and a glass thermometer for reference were placed in an MR-compatible tube phantom within a water bath. Temperature measurements were carried out at three different MR systems covering static magnetic fields up to B0  = 9.4T, and water temperatures were changed between 25°C and 65°C. RESULTS The GaAs-probe significantly underestimated absolute temperatures by an amount related to the square of B0 . A maximum difference of ΔT = -4.6°C was seen at 9.4T. No systematic temperature difference was found with the phosphor ceramic probe. For both systems, the measurements were not dependent on the orientation of the sensor to B0 . CONCLUSION Temperature measurements with the phosphor ceramic probe are immune to magnetic fields up to 9.4T, whereas the GaAs-probes either require a recalibration inside the MR system or a correction based on the square of B0 . Magn Reson Med, 2014. © 2014 Wiley Periodicals, Inc.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Jung, Bernd

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0740-3194

Publisher:

Wiley-Liss

Language:

English

Submitter:

Aisha Stefania Mzinga

Date Deposited:

01 May 2015 15:44

Last Modified:

05 Nov 2015 11:18

Publisher DOI:

10.1002/mrm.25314

PubMed ID:

24946959

Uncontrolled Keywords:

MR safety; MR thermometry; fiber-optical temperature measurement; temperature measurements in high magnetic fields

BORIS DOI:

10.7892/boris.66865

URI:

https://boris.unibe.ch/id/eprint/66865

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