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Isotropic three-dimensional cardiac cine imaging at 0.55T using stack-of-spiral sampling and four-dimensional

Rajiv Ramasawmy1, Ahsan Javed1, Daniel A Herzka2

  • 1Laboratory of Imaging Technology, Cardiovascular Branch, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA.

Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance
|January 25, 2026
PubMed
Summary

This study presents an efficient free-breathing 3D cardiac MRI technique using spiral acquisition and motion-compensated reconstruction. The method achieves 2mm isotropic resolution in 6 minutes, offering a valuable clinical tool for cardiac imaging.

Keywords:
0.55T MRIFree-breathingIsotropicMotion-compensated reconstructionStack-of-spiralThree-dimensional cine

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Area of Science:

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

Background:

  • Isotropic 3D cine MRI offers versatile cardiac assessment but faces challenges with long reconstruction and acquisition times, especially at lower field strengths.
  • Current free-breathing 3D cine MRI techniques require optimization for efficiency and speed.
  • Maximizing acquisition efficiency at 0.55T is crucial for clinical applicability.

Purpose of the Study:

  • To develop and evaluate an efficient free-breathing 3D cine MRI technique at 0.55T.
  • To improve acquisition and reconstruction efficiency for cardiac MRI.
  • To enable high-resolution isotropic 3D cardiac imaging within clinically relevant timeframes.

Main Methods:

  • Implemented a 6-minute, 2mm isotropic 3D cine stack-of-spiral balanced steady-state free precession (bSSFP) acquisition at 0.55T.
  • Utilized tiny-golden-angle in-plane rotations and variable-density k-space sampling.
  • Employed a 4D iterative motion compensation (4D iMoCo) reconstruction incorporating navigator data for respiratory motion resolution.

Main Results:

  • The 4D iMoCo reconstruction time was 20 minutes.
  • Variable-density sampling reduced artifacts and increased signal-to-noise ratio by 221±99% compared to linear sampling.
  • Measurements showed good agreement with 2D Cartesian reference data, with minor biases in ventricular volumes and ejection fraction.

Conclusions:

  • An efficient free-breathing 3D cardiac MRI technique was developed, enabling 2mm isotropic imaging in 6 minutes acquisition and 20 minutes reconstruction at 0.55T.
  • The proposed method demonstrates potential for reducing artifacts and improving image quality.
  • This technique could serve as a valuable clinical tool for cardiac imaging.