Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Eddy current distributions in cylindrical samples: effect on equivalent sample resistance.

M D Harpen1

  • 1University of South Alabama, Department of Radiology, Mobile 36617.

Physics in Medicine and Biology
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Partial wave analysis of the ultrasound comet tail artifact.

Medical physics·2000
Same author

A simple theorem relating noise and patient dose in computed tomography.

Medical physics·1999
Same author

ACR standard for luminance and illuminance. American College of Radiology.

AJR. American journal of roentgenology·1999
Same author

A computer simulation of wavelet noise reduction in computed tomography.

Medical physics·1999
Same author

An introduction to wavelet theory and application for the radiological physicist.

Medical physics·1998
Same author

Dynamic magnetic resonance imaging in evaluating suspicious breast lesions: correlation with pathologic findings.

Southern medical journal·1998

This study introduces a novel technique to calculate eddy current distributions in irregularly shaped conductive samples within NMR RF coils. It provides a general formula for sample-induced coil resistance, applicable to cylindrical solids with perpendicular induction fields.

Area of Science:

  • Electromagnetism
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science

Background:

  • Eddy currents are induced in conductive materials exposed to time-varying magnetic fields, impacting NMR coil performance.
  • Previous models often simplify sample geometry and magnetic field orientation, limiting applicability.
  • Understanding eddy current effects is crucial for accurate NMR measurements and coil design.

Purpose of the Study:

  • To develop a general method for determining eddy current distributions in irregularly shaped conductive samples within NMR RF coils.
  • To derive a general expression for the coil resistance induced by the sample.
  • To analyze a specific case of a conducting cylinder with magnetic induction perpendicular to its axis.

Main Methods:

  • A general mathematical technique is presented for calculating eddy current distributions.

Related Experiment Videos

  • A general expression for sample-induced coil resistance is derived.
  • The technique is applied to a conducting cylinder with induction perpendicular to the axis, contrasting with prior parallel induction models.

    • Main Results:

    • The study provides a method to determine eddy current distributions for complex sample shapes.
    • A formula for sample-induced coil resistance is established.
    • Irregularly shaped eddy current streamlines are analyzed for a cylinder under perpendicular induction.

    Conclusions:

    • The presented technique offers a more versatile approach to analyzing eddy current phenomena in NMR.
    • The findings are applicable to a broader range of sample geometries and field orientations.
    • This work enhances the understanding of electromagnetic interactions between samples and NMR coils.