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Related Concept Videos

Eddy Currents01:25

Eddy Currents

1.8K
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
1.8K
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

1.9K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
1.9K
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

7.2K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
7.2K
Induction01:16

Induction

4.2K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
4.2K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

5.0K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
5.0K
Induced Electric Fields01:23

Induced Electric Fields

3.9K
The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
3.9K

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Related Experiment Video

Updated: Sep 18, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

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[Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method].

Xiaotao Zhang1, Yicheng Li1, Zhanping Zheng1

  • 1Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057.

Zhongguo Yi Liao Qi Xie Za Zhi = Chinese Journal of Medical Instrumentation
|June 27, 2025
PubMed
Summary

This study presents a novel method for testing gradient coils in magnetic resonance imaging systems. It uses Gauss-Legendre numerical integration to analyze electromagnetic field performance, ensuring assembly accuracy for medical imaging.

Keywords:
Gauss-Legendre numerical integrationgradient coilmagnetic resonance imaging (MRI) systemspherical harmonic coefficient

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Last Updated: Sep 18, 2025

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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Area of Science:

  • Physics
  • Engineering
  • Medical Imaging Technology

Context:

  • Gradient coils are crucial components in magnetic resonance imaging (MRI) systems.
  • Accurate electromagnetic field performance is essential for effective MRI.
  • Current testing methods lack standardization in commercial applications.

Purpose:

  • To develop and validate a feasible method for measuring and analyzing gradient coil electromagnetic field performance.
  • To ensure the assembly accuracy of gradient coils meets stringent electromagnetic field requirements.
  • To provide a standardized approach for gradient coil testing in MRI production.

Summary:

  • This research introduces a testing methodology for MRI gradient coils based on Gauss-Legendre numerical integration.
  • A data acquisition system is built to measure magnetic field performance.
  • Numerical analysis calculates spherical harmonic coefficients from discrete test data, enabling magnetic field performance evaluation.

Impact:

  • Provides a reliable and feasible method for the production and testing of gradient coils.
  • Contributes to improved quality control and performance verification in MRI systems.
  • Enhances the accuracy and reliability of magnetic resonance imaging through precise gradient coil characterization.