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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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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Related Experiment Video

Updated: May 30, 2026

Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET
09:03

Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET

Published on: October 22, 2019

Optimized RF shielding techniques for simultaneous PET/MR.

D Truhn1, F Kiessling, V Schulz

  • 1Institute of Experimental Molecular Imaging, Pauwelsstrafle 20, 52074 Aachen and Philips Research Europe-Aachen, Weisshausstr. 2, 52066 Aachen, Germany. daniel.truhn@googlemail.com

Medical Physics
|August 24, 2011
PubMed
Summary
This summary is machine-generated.

A multilayered shielding enclosure significantly enhances protection for positron emission tomography (PET) detector electronics in combined PET-MR systems. This advanced shielding is crucial for high-frequency magnetic fields, improving overall system performance.

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Simultaneous fMRI and Electrophysiology in the Rodent Brain
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Simultaneous fMRI and Electrophysiology in the Rodent Brain

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Simultaneous fMRI and Electrophysiology in the Rodent Brain

Published on: August 19, 2010

Area of Science:

  • Medical Imaging Physics
  • Electromagnetic Compatibility

Background:

  • Integrating Positron Emission Tomography (PET) and Magnetic Resonance (MR) systems presents unique shielding challenges for sensitive PET detector electronics.
  • Effective shielding is critical to mitigate electromagnetic interference (EMI) from the MR environment, ensuring PET data integrity.

Purpose of the Study:

  • To evaluate the effectiveness of a multiple shell shielding enclosure compared to a single shell for PET detector electronics in hybrid PET-MR scanners.
  • To determine the impact of shielding design on electromagnetic field mitigation at different frequencies relevant to PET-MR operation.

Main Methods:

  • Utilized a spherical shell model to derive analytical solutions for electromagnetic shielding.
  • Performed numerical computations of electromagnetic fields using FEKO software.
  • Conducted experimental validation to confirm the theoretical and numerical findings.

Main Results:

  • A multilayered shielding approach demonstrated negligible impact on low-frequency magnetic fields (MR gradient fields).
  • The multiple shell setup significantly improved shielding effectiveness by orders of magnitude at high frequencies (proton resonant frequency).

Conclusions:

  • Multilayered shielding enclosures offer superior protection for PET detector electronics against high-frequency interference in combined PET-MR systems.
  • Employing a multiple shell setup can effectively reduce eddy currents induced by MR gradient fields, enhancing shielding performance at the proton resonant frequency.