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Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
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Author Spotlight: Optimized Lung MRI Protocol with Computationally Efficient Reconstruction Methods
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Free-breathing, zero-TE MR lung imaging.

Fabio Gibiino1, Laura Sacolick, Anne Menini

  • 1Department of Information Engineering, EIT, University of Pisa, Largo Lucio Lazzarino 2, 56122, Pisa, Italy, f.gibiino@gmail.com.

Magma (New York, N.Y.)
|September 10, 2014
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Summary
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Three-dimensional (3D) radial zero-echo time (TE) magnetic resonance (MR) imaging offers high-resolution, free-breathing lung scans. Both prospective and retrospective motion correction techniques yield excellent results within practical scan times.

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Area of Science:

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

Background:

  • High-resolution imaging of the lung parenchyma and vasculature is challenging due to respiratory motion.
  • Traditional magnetic resonance (MR) techniques often require breath-holding, limiting scan duration and patient comfort.
  • Zero-echo time (TE) imaging offers potential for capturing fast-decaying signals crucial for lung imaging.

Purpose of the Study:

  • To investigate the efficacy of three-dimensional (3D) radial, zero-echo time (TE) magnetic resonance (MR) imaging for high-resolution, free-breathing lung imaging.
  • To evaluate the performance of prospective and retrospective motion correction techniques in this context.
  • To assess the image quality and scan times achievable with this novel approach.

Main Methods:

  • Implementation of 3D radial zero-TE imaging using a rotating-ultra-fast-imaging-sequence (RUFIS) approach.
  • Application of prospective triggering (PT), prospective gating (PG), and retrospective gating (RG) for respiratory motion correction.
  • Demonstration of the technique on four healthy volunteers using a 3 Tesla (3T) MR scanner.

Main Results:

  • 3D radial zero-TE imaging efficiently captures lung parenchyma and vessel signals with high bandwidth and minimal TE.
  • Free-breathing acquisition with zero-TE resulted in minimal blurring artifacts compared to Cartesian encoding.
  • Prospective methods (PT, PG) achieved 1.2 mm resolution in ~6 minutes, while retrospective gating (RG) allowed multi-phase imaging in ~15 minutes.

Conclusions:

  • Zero-echo time (TE) is a promising pulse sequence for achieving 3D isotropic lung MR imaging.
  • Both prospective and retrospective motion correction strategies enable high-quality, free-breathing MR lung imaging within acceptable scan times.
  • This technique holds potential for improved diagnostic capabilities in pulmonary imaging.