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Improved ECG-gated cardiac cine imaging with variable initial value based tiny golden-angle radial trajectory.

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A new Variable Initial value-based tiny Golden-Angle radial trajectory (VIGA) improves cardiac MRI. VIGA offers better motion insensitivity and k-space coverage than conventional or segmented golden-angle methods for cardiac cine imaging.

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ECG‐gated cardiac cine imagingK‐space samplingTiny golden‐angle ratiovariable initial value

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Area of Science:

  • Medical Imaging
  • Cardiovascular MRI
  • Image Reconstruction

Background:

  • Electrocardiogram-gated cardiac cine imaging (ECG-CINE) is the standard for cardiac function assessment via MRI but suffers from motion artifacts.
  • Conventional golden-angle (CGA) sampling helps reduce motion but can cause streaking artifacts due to k-space non-uniformity.
  • Segmented golden-angle ratio (SGA) sampling addresses uniformity but compromises motion insensitivity.

Purpose of the Study:

  • To develop an efficient k-space sampling scheme for ECG-CINE that enhances motion insensitivity and optimizes k-space coverage.
  • To improve the robustness and quality of cardiac cine imaging in MRI.

Main Methods:

  • Proposed a Variable Initial value-based tiny Golden-Angle radial trajectory (VIGA) sampling scheme.
  • VIGA uses tiny golden-angle ratios within heartbeats for motion insensitivity and k-space uniformity.
  • A golden ratio of the golden angle is applied across heartbeats to optimize coverage, validated via simulations, phantoms, and in vivo experiments.

Main Results:

  • VIGA and SGA maintained optimal k-space coverage irrespective of spokes per heartbeat, unlike CGA.
  • VIGA outperformed CGA with suboptimal spokes and SGA with residual respiratory motion.
  • VIGA showed statistically significant improvements over CGA and SGA in image quality metrics and subjective ratings.

Conclusions:

  • VIGA is a novel, efficient k-space sampling scheme enhancing uniformity and motion insensitivity in cardiac MRI.
  • VIGA provides robust image quality for prospective and retrospective cardiac cine imaging.
  • VIGA presents a clinically viable alternative to CGA and SGA for cardiac MRI applications.