Chapter 15

Non-Invasive Thermometry with Magnetic Resonance Imaging

Henrik Odéen

Henrik Odéen

Utah Center for Advanced Imaging Research, Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, UT, USA

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Dennis L. Parker*

Dennis L. Parker*

Utah Center for Advanced Imaging Research, Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, UT, USA

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First published: 27 April 2018
Citations: 5

Summary

This chapter considers the mechanism of measuring temperature and temperature changes with magnetic resonance imaging (MRI). It first covers the basic principles and physics of MRI, and in more detail how the MRI signal is generated, detected, and localized using weak spatially varying magnetic fields called gradient fields. The chapter also covers magnetic resonance temperature imaging (MRTI) in detail. All currently used methods of MRTI, such as the proton resonance frequency shift (PRFS) method and the temperature dependence of the T1 and T2 relaxations times, are discussed. T2-based thermometry has recently been used in vivo to monitor the temperature in subcutaneous fat during MR-guided focused ultrasound treatments of uterine fibroids. Magnetic resonance spectroscopic imaging (MRSI) temperature measurement methods are based on the concept that the separation of peaks from different tissue components in a frequency spectrum is a function of temperature. The chapter concludes by discussing some practical MRTI considerations.

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