Whole-heart contrast-enhanced coronary magnetic resonance angiography using gradient echo interleaved EPI

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Medical Technology

Background:

• Whole-heart coronary magnetic resonance angiography (MRA) is crucial for diagnosing coronary artery disease.
• Current MRA techniques suffer from long imaging times (10-15 minutes), leading to patient discomfort and motion artifacts.
• Reducing scan time is essential for improving the clinical utility of whole-heart coronary MRA.

Purpose of the Study:

• To optimize a gradient echo interleaved echo planar imaging (GRE-EPI) acquisition scheme.
• To significantly reduce imaging time for contrast-enhanced whole-heart coronary MRA.
• To maintain or improve image quality and diagnostic accuracy compared to existing methods.

Main Methods:

• Utilized numerical simulations and phantom studies to optimize GRE-EPI sequence parameters.
• Acquired whole-heart coronary MRA images in healthy volunteers using the optimized GRE-EPI sequence.
• Compared the GRE-EPI sequence with a standard 3D TrueFISP sequence for performance evaluation.
• Employed slow infusion of Gd-DTPA to enhance signal-to-noise ratio (SNR) for GRE-EPI.

Main Results:

• Achieved whole-heart coronary MRA with a true resolution of 1.0 x 1.1 x 2.0 mm³.
• Acquisition time averaged 4.7 ± 0.7 minutes, a reduction by a factor of 2 compared to TrueFISP.
• Demonstrated excellent delineation of all major coronary arteries.
• Achieved an average navigator efficiency of 44 ± 6%.

Conclusions:

• The optimized GRE-EPI sequence effectively reduces imaging time for whole-heart coronary MRA.
• This accelerated MRA technique offers a promising alternative for coronary artery disease detection.
• Shorter scan times enhance patient comfort and reduce motion-related artifacts, improving diagnostic robustness.