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Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent
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Quantitative oxygenation venography from MRI phase.

Audrey P Fan1, Berkin Bilgic, Louis Gagnon

  • 1Magnetic Resonance Imaging Group, Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, Massachusetts, USA.

Magnetic Resonance in Medicine
|September 6, 2013
PubMed
Summary
This summary is machine-generated.

This study presents a new method for quantitative oxygenation venograms, mapping blood oxygen saturation (SvO2) in cerebral veins using quantitative susceptibility mapping (QSM). The technique shows promise for clinical use in venous oxygenation imaging.

Keywords:
brain oxygenationquantitative susceptibilityvenographyvenous oxygen saturation

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Area of Science:

  • Medical Imaging
  • Neuroimaging
  • Biophysics

Background:

  • Accurate measurement of venous oxygen saturation (SvO2) is crucial for understanding brain function and disease.
  • Current methods for quantifying SvO2 in cerebral vasculature have limitations in spatial resolution and applicability.

Purpose of the Study:

  • To develop and validate methods for creating quantitative oxygenation venograms.
  • To map in vivo oxygen saturation (SvO2) along cerebral venous vasculature using quantitative susceptibility mapping (QSM).

Main Methods:

  • Regularized quantitative susceptibility mapping (QSM) was employed to reconstruct magnetic susceptibility values and estimate SvO2 in veins.
  • Dual-echo, flow-compensated phase images were acquired in healthy volunteers to generate QSM images.
  • Veins in susceptibility maps were vectorized to create a 3D vascular mesh (venogram) for displaying SvO2.

Main Results:

  • Quantitative oxygenation venograms successfully mapped SvO2 along cerebral veins in vivo.
  • Estimated SvO2 values in major cerebral veins were within the normal physiological range.
  • ℓ1 regularization in QSM demonstrated less than 10% SvO2 absolute error in simulations, outperforming ℓ2 regularization.

Conclusions:

  • The developed analysis of susceptibility images enables reliable quantitative SvO2 mapping along venograms.
  • This technique may facilitate the clinical application of venous oxygenation imaging.