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Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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Accelerated three-dimensional cine phase contrast imaging using randomly undersampled echo planar imaging with

Tamer A Basha1, Mehmet Akçakaya, Beth Goddu

  • 1Department of Medicine (Cardiovascular Division), Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.

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Summary

This study presents an accelerated 3D cine phase contrast MRI technique, reducing scan time by seven-fold. The new method accurately quantifies blood flow, offering a faster alternative for cardiovascular imaging.

Keywords:
4D flowcompressed sensingecho planar imagingphase contrast MR

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Area of Science:

  • Medical Imaging
  • Cardiovascular MRI
  • Image Reconstruction

Background:

  • Traditional 3D cine phase contrast MRI is time-consuming.
  • Accelerated imaging techniques are needed to improve patient comfort and throughput.
  • Compressed sensing (CS) and echo planar imaging (EPI) offer potential for acceleration.

Purpose of the Study:

  • To implement and evaluate an accelerated 3D cine phase contrast MRI sequence.
  • To combine randomly sampled 3D k-space acquisition with EPI readout.
  • To assess the accuracy of blood flow quantification compared to standard 2D techniques.

Main Methods:

  • Developed an accelerated 3D cine phase contrast MRI sequence using EPI readout and randomly undersampled 3D k-space data.
  • Reconstructed undersampled data using low-dimensional structural self-learning and thresholding (LOST).
  • Acquired data in 11 healthy adults with an overall acceleration factor of 7, comparing with a standard 2D cine sequence.

Main Results:

  • Achieved an average scan time of 3 minutes and 30 seconds for the accelerated 3D sequence.
  • Demonstrated statistically equivalent measurements of mean velocity and stroke volume in the aorta between 3D and 2D sequences.
  • Confirmed accurate blood flow quantification with the accelerated 3D sequence.

Conclusions:

  • The combination of EPI, randomly undersampled 3D k-space, and LOST reconstruction significantly reduces scan time for 3D cine phase contrast MRI.
  • This accelerated sequence provides accurate blood flow quantification without compromising diagnostic quality.
  • The technique offers a promising advancement for efficient cardiovascular MRI.