Accelerated whole-heart coronary MRA using motion-corrected sensitivity encoding with three-dimensional projection...

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Medical Diagnostics

Background:

• Whole-heart coronary magnetic resonance angiography (MRA) is crucial for diagnosing heart conditions.
• Achieving high spatial resolution and short scan times in free-breathing MRA remains a challenge.
• Current methods often require breath-holding or longer scan durations, limiting patient comfort and applicability.

Purpose of the Study:

• To develop and validate a novel free-breathing whole-heart coronary MRA technique.
• To attain isotropic spatial resolution of (1.0 mm)(3).
• To achieve a scan time of 5 minutes or less.

Main Methods:

• Utilized an electrocardiograph-gated, T2-prepared, fat-saturated balanced steady-state free precession sequence with a 3DPR trajectory.
• Implemented a self-calibrating iterative SENSE reconstruction with integrated retrospective motion correction.
• Acquired free-breathing data with 100% gating efficiency.

Main Results:

• The proposed method significantly improved apparent signal-to-noise ratio (aSNR) and coronary artery (CA) visualization scores compared to motion-corrected gridding.
• Even with undersampled datasets (as few as 10,000 projections), the method yielded good CA visualization (3.02/4).
• Image quality metrics with 10,000 projections were comparable to traditional methods using 20,000 projections.

Conclusions:

• The developed method enables high-quality, free-breathing whole-heart coronary MRA at (1.0 mm)(3) resolution.
• An achievable scan time of 5 minutes was demonstrated.
• This technique offers a promising solution for efficient and effective coronary artery imaging.