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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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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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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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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Microtesla MRI with dynamic nuclear polarization.

Vadim S Zotev1, Tuba Owens, Andrei N Matlashov

  • 1Los Alamos National Laboratory, Applied Modern Physics Group, MS D454, Los Alamos, NM 87545, USA. vzotev@laureateinstitute.org

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 17, 2010
PubMed
Summary
This summary is machine-generated.

Microtesla MRI combined with Overhauser Dynamic Nuclear Polarization (DNP) significantly boosts signal-to-noise ratios. This breakthrough enables enhanced in vivo imaging of hyperpolarized carbon-13, advancing biomedical applications.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Nuclear Magnetic Resonance

Background:

  • Microtesla Magnetic Resonance Imaging (MRI) offers potential for in vivo imaging using Earth-strength magnetic fields.
  • Current limitations include insufficient signal-to-noise ratio (SNR) due to low sample polarization.
  • Dynamic Nuclear Polarization (DNP) enhances polarization significantly without increasing field strength.

Purpose of the Study:

  • To report the first implementation of microtesla MRI combined with Overhauser DNP and Superconducting Quantum Interference Device (SQUID) detection.
  • To demonstrate enhanced NMR spectroscopy and imaging capabilities at microtesla fields.
  • To investigate the feasibility of in vivo imaging of hyperpolarized carbon-13.

Main Methods:

  • Experiments were conducted at a 96 μT measurement field, with Overhauser DNP performed at 3.5-5.7 mT using 120 MHz RF irradiation.
  • Utilized SQUID sensors for broadband signal reception.
  • Samples included water phantoms, a cactus plant, and aqueous solutions of carbon-13 labeled metabolites (bicarbonate, pyruvate, alanine, lactate) doped with TEMPO radicals.

Main Results:

  • Achieved nuclear polarization enhancement factors of up to -95 for protons and -200 for carbon-13.
  • These enhancements correspond to thermal polarizations at 0.33 T and 1.1 T, respectively.
  • Successfully measured carbon-13 NMR spectra at microtesla fields.

Conclusions:

  • SQUID-based microtesla MRI is compatible with Overhauser DNP, leading to substantial SNR improvements.
  • This integrated system shows promise for efficient in vivo imaging of hyperpolarized carbon-13.
  • Microtesla MRI with DNP could become a valuable tool for biomedical research and diagnostics.