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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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Magnetic Field of a Solenoid

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.
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

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A Solid Nitrogen Cooled MgB(2) "Demonstration" Coil for MRI Applications.

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This study tested a novel Magnesium Diboride (MgB2) superconducting magnet for MRI applications. While individual coils performed well, the assembled magnet experienced premature quenching, limiting its field generation despite using solid nitrogen cooling.

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Area of Science:

  • Materials Science
  • Superconductivity
  • Medical Imaging

Background:

  • Conventional low-temperature superconductors (LTS) require cryogenic liquid baths.
  • Magnesium Diboride (MgB2) offers potential for higher operating temperatures.
  • Developing MgB2 wires is crucial for advanced superconducting magnet applications like MRI.

Purpose of the Study:

  • To demonstrate the feasibility of using MgB2 superconductor wire for fabricating MRI magnets.
  • To evaluate the performance of a 700-mm bore MgB2 superconducting magnet operating in solid nitrogen.
  • To assess the potential of MgB2 magnets for MRI applications under novel cooling conditions.

Main Methods:

  • Construction and operation of a 700-mm bore superconducting magnet using 10 coils of MgB2 wire.
  • Immersion of the magnet in solid nitrogen (50 liters) and operation with a cryocooler in the 10-15 K range.
  • Testing individual coil performance and the assembled magnet's quench current and generated magnetic field.

Main Results:

  • Individual MgB2 coils successfully carried currents up to 100 A at 13 K.
  • The assembled magnet quenched prematurely at 79-88 A due to resistive coils.
  • A center field of 0.54 T was generated before quenching.
  • Smooth cooldown from 77 K to 10 K was achieved despite solid nitrogen usage.

Conclusions:

  • The study demonstrates the potential of MgB2 superconductor wire for MRI magnets.
  • Challenges remain in achieving consistent performance in assembled MgB2 magnets.
  • Solid nitrogen cooling offers a viable alternative for MgB2 magnet operation, enabling wider temperature ranges.