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Related Concept Videos

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...
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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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...
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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

Narrowband magnetic particle imaging.

Patrick W Goodwill1, Greig C Scott, Pascal P Stang

  • 1UCSF/UC Berkeley Joint Graduate Group in Bioengineering, University of California, Berkeley, CA 94720, USA. goodwill@berkeley.edu

IEEE Transactions on Medical Imaging
|February 13, 2009
PubMed
Summary
This summary is machine-generated.

Narrowband magnetic particle imaging (MPI) enhances signal-to-noise ratio by reducing bandwidth needs. This new method enables 3-D imaging of super-paramagnetic iron oxide nanoparticles for improved diagnostics.

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Published on: December 9, 2010

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Magnetic Particle Imaging (MPI) visualizes super-paramagnetic iron oxide (SPIO) nanoparticles, crucial contrast agents in Magnetic Resonance Imaging (MRI).
  • Traditional MPI necessitates high-bandwidth receiver coils and preamplifiers, posing challenges for optimal noise matching.
  • Limitations in current MPI technology hinder signal-to-noise ratio (SNR) and overall imaging efficiency.

Purpose of the Study:

  • To introduce Narrowband MPI, a novel approach to significantly reduce receiver bandwidth requirements.
  • To enhance the signal-to-noise ratio (SNR) in MPI for a given specific absorption rate (SAR).
  • To develop and demonstrate a new MPI instrument capable of high-resolution 3-D tomographic imaging.

Main Methods:

  • Implementation of a two-tone excitation technique, termed intermodulation, to match a high-quality factor (high-Q) narrowband receiver coil.
  • Development of a new MPI instrument designed for precise tomographic reconstruction.
  • Utilizing acrylic and tissue phantoms for phantom imaging experiments to validate the system's performance.

Main Results:

  • Narrowband MPI demonstrated a substantial reduction in bandwidth requirements compared to conventional MPI.
  • The new method achieved a significant increase in the signal-to-noise ratio (SNR) under fixed specific absorption rate (SAR) conditions.
  • The developed MPI instrument successfully performed full 3-D tomographic imaging of SPIO particles in phantoms.

Conclusions:

  • Narrowband MPI offers a promising advancement over traditional MPI by improving SNR and reducing hardware complexity.
  • The intermodulation excitation and narrowband receiver coil strategy are effective for high-performance MPI.
  • This technology paves the way for more sensitive and practical MPI applications in biomedical imaging.