Change in the proton T(1) of fat and water in mixture.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Houchun H Hu, Krishna S Nayak

Abstract

This work describes observed changes in the proton T(1) relaxation time of both water and lipid when they are in relatively homogeneous mixtures. Results obtained from vegetable oil-water emulsions, pork kidney and lard mixtures, and excised samples of white and brown adipose tissues are presented to demonstrate this change in T(1) as a function of mixture fat fraction. As an initial proof of concept, a simpler acetone-water experiment was performed to take advantage of complete miscibility between acetone and water and both components' single chemical shift peaks. Single-voxel MR spectroscopy was used to measure the T(1) of predominant methylene spins in fat and the T(1) of water spins in each setup. In the vegetable oil-water emulsions, the T(1) of fat varied by as much as 3-fold when water was the dominant mixture component. The T(1) of pure lard increased by 170 msec (+37%) when it was blended with lean kidney tissue in a 16% fatty mixture. The fat T(1) of lipid-rich white adipose tissue was 312 msec. In contrast, the fat T(1) of leaner brown adipose tissue (fat fraction 53%) was 460 msec. A change in the water T(1) from that of pure water was also observed in the experiments.

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Jan 13, 2016·Magma·K N Bhanu PrakashKai-Hsiang Chuang
Dec 12, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Pernilla PetersonSven Månsson
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Jan 4, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Kirsten KoolstraPeter Börnert
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Aug 29, 2020·Magnetic Resonance Imaging·Louis MarageHervé Saint-Jalmes
Oct 13, 2021·NMR in Biomedicine·Véronique Fortier, Ives R Levesque

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