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Magnetic Resonance Imaging01:24

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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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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.
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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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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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Double Resonance Techniques: Overview01:12

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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.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Electron magnetic resonance imaging: A technical perspective.

Eric Weber1, Ted Nowak1, Nader Behdad1

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, 53706-1691, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
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Electron magnetic resonance imaging (eMRI) offers higher sensitivity and lower power requirements than traditional MRI. This review covers eMRI techniques and medical applications like tissue oxygenation monitoring.

Keywords:
Continuous-waveElectron magnetic resonance imagingPulsedQuantitative imagingRapid-ScanSingle pointSpin probesTissue oxygenation

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Area of Science:

  • Biomedical Imaging
  • Magnetic Resonance Technology
  • Electron Paramagnetic Resonance

Background:

  • Electron magnetic resonance imaging (eMRI) is a technique analogous to magnetic resonance imaging (MRI).
  • eMRI leverages the higher gyromagnetic ratio of electrons, enabling lower power systems and higher frequencies.
  • This offers potential for enhanced sensitivity without the need for superconducting magnets.

Purpose of the Study:

  • To review continuous-wave and pulsed electron magnetic resonance imaging (eMRI) modalities.
  • To present the hardware and methodologies of various eMRI techniques.
  • To highlight the medical applications and advantages of eMRI.

Main Methods:

  • Review of continuous-wave and pulsed eMRI hardware and methodology.
  • Presentation of single point imaging (SPI), spectral-spatial imaging, and Rapid-Scan (RS) eMR.
  • Discussion of electron-rich free radical contrast agents for oxygen sensing.

Main Results:

  • eMRI systems can achieve higher sensitivity with lower power requirements compared to proton MRI.
  • eMRI has demonstrated efficacy in medical applications including tissue and tumor oxygenation, ischemia monitoring, and quantitative imaging.
  • The use of free radical agents allows for imaging of tissue characteristics based on oxygen partial pressure.

Conclusions:

  • eMRI presents a promising alternative to traditional MRI with significant advantages in sensitivity and system requirements.
  • The technology is well-suited for monitoring physiological parameters like oxygenation in various medical conditions.
  • Further development and application of eMRI techniques are expected to advance medical diagnostics.