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Related Concept Videos

Solenoids01:17

Solenoids

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field for a solenoid is the vector sum of the magnetic field due to its individual turns. For an ideal solenoid, the magnetic field inside is almost uniform and parallel to the solenoid axis, while the magnetic field outside the solenoid is nearly zero.
Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
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Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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...
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Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
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Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Related Experiment Video

Updated: Jun 7, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

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Float solenoid balun for MRI.

Ming Lu1,2, Yijin Yang3, Shuyang Chai1,3

  • 1Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

NMR in Biomedicine
|November 9, 2024
PubMed
Summary
This summary is machine-generated.

The new float solenoid balun offers superior common-mode rejection for MRI RF coils. This compact, adjustable design enhances usability and MRI performance compared to traditional bazooka baluns.

Keywords:
RF coilbaluncable trapcommon‐mode currentfloat balun

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Radio Frequency Engineering

Background:

  • Baluns are critical components in Magnetic Resonance Imaging (MRI) Radio Frequency (RF) coils.
  • They are essential for suppressing common-mode currents, preserving signal-to-noise ratio (SNR), and ensuring patient safety during MRI procedures.

Purpose of the Study:

  • Introduce and evaluate the novel float solenoid balun.
  • Compare its performance against the established float bazooka balun.
  • Assess its suitability for modern, compact MRI systems.

Main Methods:

  • Electromagnetic simulations were performed.
  • Bench testing was conducted under static magnetic fields (1.5 T, 3 T, 7 T).
  • Comparative analysis focused on common-mode rejection ratios (CMRR).

Main Results:

  • The float solenoid balun demonstrated superior common-mode rejection compared to the float bazooka balun across tested field strengths.
  • The float solenoid balun features compact dimensions and post-installation adjustability.
  • It eliminates the need for soldering on the cable shield, simplifying implementation.

Conclusions:

  • The float solenoid balun presents a significant advancement for MRI RF coil design.
  • Its compact size and ease of use address limitations of current balun technologies.
  • This innovation has the potential to improve MRI performance and enable denser RF coil arrays.