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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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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.
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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.
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Frequency-adjustable magnetic field probes.

Niklas Wehkamp1, Philipp Rovedo1, Elmar Fischer1

  • 1Faculty of Medicine, Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Freiburg, Germany.

Magnetic Resonance in Medicine
|August 4, 2020
PubMed
Summary
This summary is machine-generated.

New Nuclear Magnetic Resonance field probes enhance MR image quality. These probes are easier to manufacture and more flexible, enabling dynamic field monitoring during MR experiments.

Keywords:
MRINMR probedroplet formationfield monitoringfrequency adjustablek-space trajectory

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Area of Science:

  • Medical Imaging
  • Physics

Background:

  • Nuclear Magnetic Resonance (NMR) field probes offer potential for improving MR image quality.
  • Applications include k-space trajectory calibration and dynamic local field change measurement.

Purpose of the Study:

  • Design and construct novel field probes.
  • Improve ease of manufacturing and flexibility compared to existing probes.

Main Methods:

  • Utilize a novel light-activated resin manufacturing technique for coil assembly and 1H sample encapsulation.
  • Integrate orthogonal coils allowing real-time adjustment of proton resonance frequency via a DC-current-controlled B-field modification coil.

Main Results:

  • Demonstrated shifting of field probe position by altering Larmor frequency with an integrated micro-coil.
  • Achieved frequency modulation of 113 Hz/mA, tested up to 100 mA without visible artifacts.
  • Showcased selective off-resonant excitation and comparable gradient impulse response functions to traditional probes.

Conclusions:

  • The developed field probes facilitate concurrent field monitoring during MR experiments.
  • This approach is compatible with standard clinical scanner RF capabilities.
  • Opens new avenues for advanced MR imaging techniques.