Physical principles of MRI

David G. Norris

doi:10.1016/B978-0-12-820480-1.00157-1

Physical principles of MRI

David G. Norris^*

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Chapter › Academic › peer-review

Abstract

In this article the physical principles of MRI are described. The physics underlying each process is followed by a description of the corresponding hardware: nuclear polarization and magnets; resonance and transmit/receive hardware; the action of gradients and gradient hardware. The use of frequency-encoding for slice-selection and 1D imaging is explained. Fourier imaging is explained in terms of complex spatial frequency components, allowing a natural explanation of standard 2D imaging and echo planar imaging (EPI). Relaxation mechanisms and contrast generation for T₁, T₂, T_2', and diffusion-weighted imaging are presented. The effects of static field inhomogeneities on the imaging process are described.

Original language	English
Title of host publication	Encyclopedia of the Human Brain, Second Edition
Subtitle of host publication	Volumes 1-5
Publisher	Elsevier Doyma
Pages	V4-250-V4-271
ISBN (Electronic)	9780128204818
ISBN (Print)	9780128204801
DOIs	https://doi.org/10.1016/B978-0-12-820480-1.00157-1
Publication status	Published - 1 Jan 2024

Keywords

NLA
Diffusion-weighted-imaging
Echo-planar-imaging
Fourier imaging
Magnetic resonance imaging
Magnets
Nuclear magnetic resonance
Pulsed magnetic field gradients
Radio-frequency reception
Radio-frequency transmission
Relaxation
Slice selection
Contrast mechanism

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10.1016/B978-0-12-820480-1.00157-1

Cite this

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abstract = "In this article the physical principles of MRI are described. The physics underlying each process is followed by a description of the corresponding hardware: nuclear polarization and magnets; resonance and transmit/receive hardware; the action of gradients and gradient hardware. The use of frequency-encoding for slice-selection and 1D imaging is explained. Fourier imaging is explained in terms of complex spatial frequency components, allowing a natural explanation of standard 2D imaging and echo planar imaging (EPI). Relaxation mechanisms and contrast generation for T1, T2, T2', and diffusion-weighted imaging are presented. The effects of static field inhomogeneities on the imaging process are described.",

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KW - Diffusion-weighted-imaging

KW - Echo-planar-imaging

KW - Fourier imaging

KW - Magnetic resonance imaging

KW - Magnets

KW - Nuclear magnetic resonance

KW - Pulsed magnetic field gradients

KW - Radio-frequency reception

KW - Radio-frequency transmission

KW - Relaxation

KW - Slice selection

KW - Contrast mechanism

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SN - 9780128204801

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BT - Encyclopedia of the Human Brain, Second Edition

PB - Elsevier Doyma

ER -

Physical principles of MRI

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