Fundamental Properties of Magnetization

Yu‐Chung Norman Cheng1, E. Mark Haacke1

1 The MRI Institute for Biomedical Research, St. Louis, Missouri
Publication Name:  Current Protocols in Magnetic Resonance Imaging
Unit Number:  Unit B1.3
DOI:  10.1002/0471142719.mib0103s01
Online Posting Date:  August, 2001
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Abstract

In MR imaging the detected signal is proportional to the magnetization of an ensemble of spins (a spin isochromat). Thus, one can simply replace the magnetic moment with bulk magnetization in many equations such as the Bloch equations. The beauty is that the physics concepts behind energy, forces, and the equations of motion do not change, whether one considers a single spin or a set of spins. In this unit, the concept of bulk magnetization and quantized spin angular momentum are introduced. The dependence of the magnetization on spin density.

     
 
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Table of Contents

  • Overview
  • Technical Discussion
  • Key References
  • Figures
     
 
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Materials

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Figures

Videos

Literature Cited

Key References
   Abragam, A. 1961. The Principles of Nuclear Magnetism. Clarendon Press, New York.
  Excellent reviews of the basic quantum aspects required to understand the NMR signal appear in this text.
   Bloembergen, N., Purcell, E.M., and Pound, R.V. 1948. Relaxation effects in nuclear magnetic resonance experiments. Phys. Rev. 73:679.
  The fundamental concepts of the quantum processes are given in this article.
   Haacke, E.M., Brown, R.W., Thompson, M.R., and Venkatesan, R. 1999. Magnetic Resonance Imaging: Physical Principles and Sequence Design. John Wiley and Sons, New York.
  This text covers the technical aspects presented here, but in more detail, and also discusses more advanced materials.
   Purcell, E.M., Torrey, H.C., and Pound, R.V. 1946. Resonance absorption by nuclear magnetic moments in a solid. Phys. Rev. 69:37.
  The fundamental concepts of the quantum processes are given in this article.
   Rabi, I.I., Ramsey, N.F., and Schwinger, J. 1954. Rotating coordinates in magnetic resonance problems. Rev. Modern Phys. 26:167.
  This article presents an outstanding discussion of NMR in rotating reference frames.
   Slichter, C.P. 1990. Principles of Magnetic Resonance, 3rd ed. Springer Verlag, New York.
  This text reviews the relevant general concepts of rotation and precession in classical mechanics and NMR.
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