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Related Concept Videos

Self-Inductance01:24

Self-Inductance

Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would therefore...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field, calculated by...
Inductors01:20

Inductors

An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the applied...
Inductors01:11

Inductors

An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Spherical harmonic inductive detection coils for dynamic pre-emphasis.

Karl Edler1, David Hoult

  • 1Institute for Biodiagnostics, National Research Council Canada, 435 Ellice Avenue Winnipeg, MB, Canada R3B 1Y6. karl.edler@nrc-cnrc.gc.ca

Magnetic Resonance in Medicine
|July 31, 2008
PubMed
Summary

This study introduces a new method to correct eddy currents in magnetic field gradients. The technique dynamically senses and adjusts spatial harmonic components, improving magnetic field stability.

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Area of Science:

  • Physics
  • Engineering
  • Magnetic Resonance Imaging

Background:

  • Eddy currents from rapid magnetic field gradient switching pose a significant challenge.
  • Existing methods struggle to adequately address these induced currents.

Purpose of the Study:

  • To present a novel methodology for sensing and correcting eddy currents.
  • To enable dynamic shaping of eddy current corrections for magnetic fields.

Main Methods:

  • Continuous sensing of spatial harmonic components via their temporal rates of change.
  • Application of correction currents to gradient or shim coils.
  • Correction applied in a time frame significantly shorter than gradient rise times.

Main Results:

  • Effective detection and correction of eddy current effects on magnetic fields.
  • Demonstration of dynamic correction capabilities for multiple spatial harmonic components.

Conclusions:

  • The presented method offers a dynamic and efficient solution to the long-standing problem of eddy currents.
  • This approach has the potential to significantly enhance magnetic field stability and performance in relevant applications.