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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...
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...
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.
The...
Imaging Studies for Cardiovascular System IV: CMRI01:21

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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,...
Nuclear Magnetic Resonance (NMR): Overview01:07

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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...
Imaging Studies IV: Magnetic Resonance Imaging01:27

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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MRI with an atomic magnetometer suitable for practical imaging applications.

I M Savukov1, V S Zotev, P L Volegov

  • 1Los Alamos National Laboratory, Los Alamos, NM 87544, USA. isavukov@lanl.gov

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 14, 2009
PubMed
Summary
This summary is machine-generated.

Ultra-low field (ULF) magnetic resonance imaging (MRI) was achieved without cryogenics using an atomic magnetometer. This breakthrough enables the development of more affordable and accessible MRI scanners for wider applications.

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Area of Science:

  • Medical Imaging
  • Physics
  • Biomedical Engineering

Background:

  • Conventional Magnetic Resonance Imaging (MRI) operates at high magnetic fields (>1 Tesla), presenting significant limitations.
  • Ultra-low field (ULF) MRI systems aim to overcome these limitations but traditionally require cryogenics.
  • Existing ULF MRI systems depend on low-temperature Superconducting Quantum Interference Devices (SQUIDs), necessitating expensive cooling.

Purpose of the Study:

  • To demonstrate the feasibility of ultra-low field MRI without the need for cryogenics.
  • To explore the potential of non-cryogenic atomic magnetometers for ULF MRI applications.
  • To pave the way for more accessible and cost-effective MRI technologies.

Main Methods:

  • Implementation of an ultra-low field MRI system utilizing a non-cryogenic atomic magnetometer.
  • Operation of the MRI system at microtesla field strengths.
  • Acquisition of MRI data without the use of superconducting devices or cryogens.

Main Results:

  • Successful demonstration of ultra-low field MRI (ULF-MRI) using atomic magnetometry.
  • Achieved MRI signals at microtesla field strengths without cryogenic cooling.
  • Validation of a novel, non-cryogenic approach for ULF MRI.

Conclusions:

  • Non-cryogenic atomic magnetometers can effectively be used for ultra-low field MRI.
  • This technology eliminates the need for cryogens, significantly reducing system complexity and cost.
  • The development opens avenues for inexpensive, widely deployable MRI scanners.