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Related Concept Videos

Oxygen Transport in the Blood01:27

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
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Related Experiment Video

Updated: Feb 25, 2026

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Oxygen metabolism in acute ischemic stroke.

Weili Lin1,2, William J Powers2

  • 11 Biomedical Research Imaging Center and Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|August 10, 2017
PubMed
Summary

Magnetic resonance imaging (MRI) offers a practical alternative to oxygen-15 positron emission tomography (PET) for measuring brain oxygen metabolism, crucial for diagnosing conditions like cerebral ischemia.

Keywords:
Magnetic resonanceacute strokecerebral blood flowcerebral hemodynamicsimagingpositron emission tomography

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Area of Science:

  • Neuroscience
  • Medical Imaging

Background:

  • Brain oxygen metabolism is vital for understanding neurological conditions, especially cerebral ischemia.
  • Positron emission tomography (PET) with oxygen-15 provides quantitative measures of oxygen metabolism but faces logistical challenges.
  • Magnetic resonance imaging (MRI) offers a more accessible alternative for assessing brain oxygen metabolism.

Purpose of the Study:

  • To review the pathophysiological basis of altered cerebral hemodynamics and oxygen metabolism in cerebral ischemia.
  • To discuss quantitative methods for measuring cerebral oxygen metabolism, including the Kety-Schmidt approach.
  • To explore the physical concepts behind non-invasive oxygen metabolism imaging and its clinical applications.

Main Methods:

  • Review of existing literature on brain oxygen metabolism and imaging techniques.
  • Discussion of the Kety-Schmidt approach for quantitative metabolism measurement.
  • Explanation of non-invasive MRI-based imaging principles for oxygen metabolism.

Main Results:

  • Quantitative measures of cerebral metabolic rate of oxygen using PET can discern brain tissue viability in ischemia.
  • MRI-based approaches provide comparable quantitative measures of cerebral oxygen metabolism to PET.
  • MRI's wide availability suggests broader clinical impact, especially in time-sensitive conditions like cerebral ischemia.

Conclusions:

  • MRI-based techniques present a promising, widely applicable alternative to PET for assessing brain oxygen metabolism.
  • These MRI approaches hold significant potential for clinical applications, particularly in managing cerebral ischemia.
  • Understanding altered cerebral hemodynamics and metabolism is key to improving patient outcomes.