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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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Mapping and quantifying hyperpolarized 3He magnetic resonance imaging apparent diffusion coefficient gradients.

Andrea Evans¹, David G McCormack, Giles Santyr

¹Imaging Research Laboratories, Robarts Research Institute, Department of Medical Biophysics, University of Western Ontario, 100 Perth Drive PO Box 5015, London, Ontario, Canada N6A 5K8.

Journal of Applied Physiology (Bethesda, Md. : 1985)

|June 7, 2008

Summary

This summary is machine-generated.

Hyperpolarized helium-3 MRI apparent diffusion coefficient (ADC) gradients effectively measure lung heterogeneity in chronic obstructive pulmonary disease (COPD). This imaging technique can distinguish between different stages of COPD and healthy lungs.

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Area of Science:

Pulmonary Medicine
Radiology
Medical Imaging

Background:

Chronic obstructive pulmonary disease (COPD) is a progressive lung disease characterized by airflow limitation and lung heterogeneity.
Accurate assessment of lung heterogeneity is crucial for staging and managing COPD.
Current imaging techniques may not fully capture the complex structural changes in COPD airways and air spaces.

Purpose of the Study:

To evaluate the utility of hyperpolarized helium-3 magnetic resonance imaging (3He MRI) apparent diffusion coefficients (ADC) and ADC gradients for quantifying lung heterogeneity in COPD.
To determine if ADC gradients can differentiate between different stages of COPD and healthy individuals.

Main Methods:

Hyperpolarized 3He MRI was performed on 24 subjects (8 healthy, 9 GOLD stage II COPD, 7 GOLD stage III COPD).
Apparent diffusion coefficients (ADC) and ADC gradients were measured using a three-by-three voxel region of interest (ROI) analysis.
The magnitude of the ADC gradient (|G3x3|) was calculated to assess local ADC heterogeneity.

Main Results:

While 3He ADC standard deviation did not differ significantly across groups, the mean magnitude of the ADC gradient (|G3x3|) was significantly different between healthy subjects and those with stage II COPD (P<0.02).
Mean |G3x3| was also significantly higher in stage III COPD compared to stage II COPD (P<0.005).
The |G3x3| metric showed significant differences between healthy individuals and both stage II and stage III COPD patients, indicating sensitivity to lung heterogeneity.

Conclusions:

The second-order statistic |G3x3|, derived from hyperpolarized 3He MRI ADC gradients, serves as a sensitive quantitative measure of lung tissue heterogeneity.
|G3x3| can effectively differentiate between healthy lungs and varying stages of COPD, offering potential for improved disease assessment.
This imaging approach may provide valuable insights into the complex airway and air space abnormalities in COPD.