FIESTA-ET: high-resolution cardiac imaging using echo-planar steady-state free precession

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Medical Physics

Background:

• Cardiac MRI requires efficient imaging techniques for accurate diagnosis.
• Conventional steady-state free precession (SSFP) methods can be time-consuming.
• Multishot echo-planar imaging (EPI) offers faster acquisition but can be sensitive to artifacts.

Purpose of the Study:

• To introduce and evaluate a novel multishot EPI-SSFP technique (FIESTA-ET) for rapid, high-resolution, multislice cine cardiac MRI.
• To assess the feasibility of FIESTA-ET on standard clinical scanners without offline reconstruction.
• To compare FIESTA-ET with conventional SSFP (FIESTA) in terms of acquisition time, image quality, and quantitative measurements.

Main Methods:

• Development of FIESTA-ET, combining multishot EPI with SSFP for cardiac cine imaging.
• Comparison study involving 10 healthy volunteers.
• Quantitative analysis of myocardial signal-to-noise ratio (SNR) and ventricular volumes.

Main Results:

• FIESTA-ET achieved comparable image quality to conventional FIESTA.
• Acquisition time per slice was halved with FIESTA-ET compared to FIESTA.
• The entire heart was scanned in under 2 minutes using FIESTA-ET.
• A significant 16% increase in myocardial SNR was observed with FIESTA-ET (P < 0.0005).
• Volumetric measurements demonstrated excellent correlation between FIESTA-ET and FIESTA.

Conclusions:

• FIESTA-ET is a high-resolution, rapid cardiac MRI technique suitable for clinical use.
• The method significantly reduces scan time while maintaining or improving image quality and quantitative accuracy.
• FIESTA-ET enables comprehensive cardiac imaging within a single breathhold, enhancing patient comfort and diagnostic efficiency.