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. Author manuscript; available in PMC: 2020 Feb 1.
Published in final edited form as: Prog Nucl Magn Reson Spectrosc. 2019 Jan 31;110:34–61. doi: 10.1016/j.pnmrs.2019.01.003

Fig. 2.

Fig. 2

Schematic depicting the temperature dependence of the PRF. At lower temperatures strong hydrogen bondings exist between water molecules, resulting is weak shielding of the hydrogen proton. As temperature increases the molecular movements increase and the hydrogen bonds start to break, resulting in greater shielding from the electron cloud, and a lower resonance frequency. From Chapter 15 in Theory and Applications of Heat Transfer in Humans. Henrik Odéen and Dennis L Parker, Non-Invasive Thermometry with Magnetic Resonance Imaging. Devashish Shrivastava (Editor). John Wiley and Sons 2018. Reprinted with permission.