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Related Experiment Video

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Author Spotlight: Advancing Lung Disease Research with Free-Breathing Hyperpolarized Xenon-129 MRI
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Quantification of human lung structure and physiology using hyperpolarized 129Xe.

Yulin V Chang1, James D Quirk, Iulian C Ruset

  • 1Biomedical Magnetic Resonance Laboratory, Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, USA; Department of Physics, Washington University, St. Louis, Missouri, USA.

Magnetic Resonance in Medicine
|October 25, 2013
PubMed
Summary

This study validates a new noninvasive method using hyperpolarized xenon to measure lung microstructure and physiology in humans. The technique accurately quantifies key parameters like blood-air barrier thickness, offering a promising tool for lung disease screening.

Keywords:
Fahraeus effectbarrier thicknessfield-dependent chemical shiftlung physiologysurface-area-to-volume ratio

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Area of Science:

  • Pulmonary Medicine
  • Medical Imaging
  • Physiology

Background:

  • Accurate measurement of lung microstructure and physiology is crucial for diagnosing and managing respiratory diseases.
  • Noninvasive methods for assessing parameters like blood-air barrier thickness are limited.
  • Previous methods for measuring these parameters required invasive techniques.

Purpose of the Study:

  • To validate a novel, noninvasive method for measuring key pulmonary parameters in vivo in humans.
  • To demonstrate the capability of the method to quantify parameters not readily measurable by other noninvasive modalities.
  • To assess lung microstructure and physiology using hyperpolarized xenon MRI.

Main Methods:

  • Healthy volunteers (n=12) underwent MRI scans at 1.5T and 3T using hyperpolarized xenon.
  • Xenon uptake by lung parenchyma and blood was measured using chemical shift saturation recovery.
  • Data were fitted to a model of xenon exchange (MOXE) to derive pulmonary parameters.

Main Results:

  • The study successfully measured several pulmonary parameters noninvasively.
  • Key results include: surface-area-to-volume ratio (210 ± 50 cm⁻¹), total septal wall thickness (9.2 ± 6.5 μm), blood-air barrier thickness (1.0 ± 0.3 μm), hematocrit (27 ± 4%), and pulmonary capillary blood transit time (1.3 ± 0.3 s).
  • These values align well with established literature data from invasive experiments.

Conclusions:

  • The validated method allows for noninvasive determination of lung physiology through simultaneous quantification of key pulmonary parameters.
  • This technique shows significant promise as a versatile screening tool for various lung diseases.
  • In vivo human validation confirms the utility of this advanced MRI approach.