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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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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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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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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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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Oxygenation Imaging by Nuclear Magnetic Resonance Methods.

Heling Zhou1, Nuria Arias-Ramos2, Pilar López-Larrubia3

  • 1Prognostic Imaging Research Laboratory, Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA.

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Summary

Magnetic resonance imaging (MRI) offers advanced techniques for in vivo oxygen monitoring. These methods, using injected agents or endogenous contrasts, precisely measure oxygen levels (pO2) for understanding biological processes and diseases.

Keywords:
BOLDHypoxiaMRIOximetryPerfluorocarbonsQuantificationpO2

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Area of Science:

  • Biomedical Imaging
  • Physiology
  • Medical Diagnostics

Background:

  • Oxygen's critical role in biological processes necessitates precise monitoring.
  • Understanding oxygen dynamics is key to studying normal physiology and diseases like cancer and neurodegeneration.
  • In vivo oxygen monitoring requires advanced techniques for subcellular to macroscopic assessments.

Purpose of the Study:

  • To review magnetic resonance imaging (MRI) based techniques for in vivo oxygenation assessment.
  • To highlight methodologies for quantitative and qualitative oxygen measurements.
  • To underscore the importance of oxygen monitoring in understanding health and disease.

Main Methods:

  • Quantitative pO2 measurements using injected fluorinated agents with high precision and resolution.
  • Qualitative hypoxia evaluation via endogenous contrast changes (deoxyhemoglobin, oxygen) using T2* and T1 measurements.
  • Application of MRI for assessing physiological oxygen distribution and dynamics in vivo.

Main Results:

  • Fluorinated agents enable precise, quantitative pO2 mapping.
  • Endogenous contrast measurements offer qualitative insights into hypoxia.
  • MRI techniques provide valuable data for diverse biological and medical applications.

Conclusions:

  • MRI-based techniques are powerful tools for in vivo oxygen monitoring.
  • Both exogenous and endogenous contrast methods offer complementary approaches to assess oxygenation.
  • Accurate oxygen monitoring is crucial for advancing our understanding of physiological and pathological states.