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Compressed sensing in hyperpolarized 3He lung MRI.

Salma Ajraoui1, Kuan J Lee, Martin H Deppe

  • 1Unit of Academic Radiology, University of Sheffield, Sheffield, UK.

Magnetic Resonance in Medicine
|April 8, 2010
PubMed
Summary

Compressed sensing significantly enhances hyperpolarized Helium-3 (3He) lung MRI by improving temporal resolution and enabling accurate functional apparent diffusion coefficient (ADC) mapping, even with reduced data acquisition.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Pulmonary Medicine

Background:

  • Hyperpolarized Helium-3 (3He) MRI is a valuable tool for lung ventilation imaging.
  • Acquisition time and radiofrequency pulse usage are limitations in current 3He MRI.
  • Compressed sensing (CS) offers potential for accelerated image acquisition.

Purpose of the Study:

  • To investigate the application of compressed sensing (CS) for hyperpolarized 3He lung MRI.
  • To evaluate the impact of CS on temporal resolution and quantitative imaging (ADC maps).
  • To demonstrate the feasibility of CS in prospective 3He lung MRI acquisition.

Main Methods:

  • Simulations using fully sampled 2D and 3D 3He lung ventilation images.
  • Random undersampling of k-space data and reconstruction using L1 norm minimization.

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  • Prospective acquisition of 2-fold undersampled 2D 3He images in a healthy volunteer.

    • Main Results:

    • Temporal resolution improved by a factor of 2 (2D) and 4-5 (3D) at typical SNR levels.
    • Accurate functional apparent diffusion coefficient (ADC) maps were generated from undersampled data.
    • Prospective CS acquisition in a healthy volunteer yielded comparable results to fully sampled images, with higher SNR (34 vs 19).

    Conclusions:

    • Compressed sensing is effective for accelerating hyperpolarized 3He lung MRI acquisition.
    • CS allows for improved temporal resolution without compromising image quality or quantitative accuracy.
    • This technique holds promise for more efficient and informative 3He lung MRI.