Comparison of Two Fiber-Optical Temperature Measurement Systems in Magnetic Fields up to 9.4 Tesla
Comparison of Two Fiber-Optical Temperature Measurement Systems in Magnetic Fields up to 9.4 Tesla
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DOI：
10.1002/mrm.25314
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发表时间：
2015-05-01
影响因子：
3.3
通讯作者：
Jung, Bernd
中科院分区：
文献类型：
--
作者：
Buchenberg, Waltraud B.;Dadakova, Tetiana;Jung, Bernd
目的磁场中精确的温度测量对于MR安全性研究和MR引导热疗过程中的温度校准是必不可少的。在这项工作中，两个常用的光纤温度测量系统的干扰与静态磁场B-0 determined.MethodsTwo光纤温度测量系统，GaAs半导体和磷光体的磷光体陶瓷，进行了比较温度测量B-0。将探头和参考用玻璃温度计放置在水浴内的MR兼容管体模中。温度测量进行了三个不同的MR系统，覆盖静态磁场高达B-0= 9.4 T，和水温之间的变化25摄氏度和65摄氏度。ResultsGaAs探头显着低估绝对温度的平方相关的量B-0。在9.4T下观察到T=-4.6 ℃的最大差异。使用磷陶瓷探头未发现系统温差。对于这两个系统，测量是不依赖于传感器的方向B-0。结论温度测量与磷陶瓷探头是免疫的磁场高达9.4 T，而GaAs探头要么需要重新校准的MR系统内或校正的基础上的平方B-0。Magn Reson Med 73：2047-2051，2015年。(c)2014威利期刊公司
PurposePrecise 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 B-0 was determined.MethodsTwo fiber-optical temperature measurement systems, a GaAs-semiconductor and a phosphorescent phosphor ceramic, were compared for temperature measurements in B-0. 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 B-0=9.4T, and water temperatures were changed between 25 degrees C and 65 degrees C.ResultsThe GaAs-probe significantly underestimated absolute temperatures by an amount related to the square of B-0. A maximum difference of T=-4.6 degrees 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 B-0.ConclusionTemperature 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 B-0. Magn Reson Med 73:2047-2051, 2015. (c) 2014 Wiley Periodicals, Inc.