Retrospectively gated cardiac cine imaging with temporal and spatial acceleration.

Area of Science:

• Magnetic Resonance Imaging
• Medical Imaging Technology
• Cardiovascular Imaging

Background:

• Parallel imaging accelerates cardiac cine MRI acquisition.
• Temporal acceleration improves image quality but is difficult to combine with retrospective gating.
• Existing methods for combined acceleration have long reconstruction times.

Purpose of the Study:

• Develop a retrospectively gated cardiac cine method with both parallel imaging and temporal acceleration.
• Achieve significant acceleration factors on standard hardware.
• Reduce reconstruction times for clinical practicality.

Main Methods:

• Implemented a novel retrospectively gated cardiac cine method combining parallel and temporal acceleration.
• Acquired data from seven cardiac patients and one healthy volunteer using an eight-channel cardiac array on a 1.5-T system.
• Tested acceleration factors of 3.5 and 4.5.

Main Results:

• Achieved good-quality cardiac cine images in all subjects, even with challenges like small FOV and arrhythmias.
• Demonstrated significantly reduced reconstruction times: 0.98±0.07 s per frame (approx. 20 s per slice).
• The combined temporal acceleration strategy showed improved resistance to artifacts compared to parallel imaging alone.

Conclusions:

• The developed method successfully combines parallel imaging and temporal acceleration for cardiac cine MRI.
• This approach offers practical, clinically viable reconstruction times.
• The technique enhances image quality and artifact resistance in accelerated cardiac MRI.