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Magnetic susceptibility quantification for arbitrarily shaped objects in inhomogeneous fields.

L Li1

  • 1Metabolic Magnetic Resonance Research & Computing Center, Department of Radiology, University of Pennsylvania, Philadelphia 19104, USA. lin@mail.mmrrcc.upenn.edu

Magnetic Resonance in Medicine
|October 25, 2001
PubMed
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This study presents a new method for magnetic susceptibility measurement in MRI, applicable to any object shape in non-uniform magnetic fields. The technique accurately quantifies magnetic properties using MR phase maps.

Area of Science:

  • Medical Physics
  • Magnetic Resonance Imaging (MRI)

Background:

  • Magnetic susceptibility measurements are crucial for MRI technical development and medical applications.
  • Accurate quantitation of magnetic susceptibility is challenging, especially for arbitrary shapes and inhomogeneous fields.

Purpose of the Study:

  • To present a general method for magnetic susceptibility quantitation applicable to objects of arbitrary shapes in inhomogeneous magnetic fields.
  • To enable in situ determination of the polarizing magnetic field within an object.

Main Methods:

  • Utilizing mean value properties of magnetic fields to determine the internal magnetic field from external measurements on a spherical surface.
  • Employing numerical computation for self-demagnetizing field correction.
  • Correcting for contact shifts.

Related Experiment Videos

  • Quantitative measurement of magnetic susceptibilities using MR gradient echo phase maps.

    • Main Results:

    • A general method for magnetic susceptibility quantitation was successfully developed and validated.
    • The method accurately determined magnetic susceptibilities for CuSO(4) phantoms.
    • In situ determination of the polarizing magnetic field was achieved.

    Conclusions:

    • The presented method offers a robust approach for magnetic susceptibility quantitation in MRI.
    • This technique has significant potential for advancing MRI technical development and medical applications.
    • Accurate susceptibility measurements can be obtained even in complex scenarios with arbitrary shapes and inhomogeneous fields.