Cardiac chamber quantification using magnetic resonance imaging at 7 Tesla--a pilot study

Area of Science:

• Cardiovascular magnetic resonance imaging (CMR)
• High-field MRI technology

Background:

• Interest in 7 Tesla (7 T) CMR is driven by potential improvements in spatial and temporal resolution.
• However, 7 T CMR presents significant technical challenges for cardiac imaging.

Purpose of the Study:

• To evaluate the feasibility of cardiac chamber quantification using cardiovascular magnetic resonance at 7 T.
• To compare the accuracy of 7 T FGRE with standard 1.5 T techniques.

Main Methods:

• Nine healthy male volunteers underwent cardiac imaging at 1.5 T and 7 T.
• Imaging sequences included steady-state free precession (SSFP) and fast gradient echo (FGRE) with varying slice thicknesses (7 mm and 4 mm).
• Calculations included end-diastolic volume, end-systolic volume, ejection fraction, and cardiac mass.

Main Results:

• 7 T FGRE provided excellent blood/myocardium contrast.
• Cardiac volumes and ejection fraction at 7 T FGRE closely matched 1.5 T SSFP, outperforming 1.5 T FGRE.
• Reducing slice thickness to 4 mm at 7 T further improved agreement with 1.5 T SSFP.

Conclusions:

• Cardiac chamber quantification at 7 T using FGRE is technically feasible.
• 7 T FGRE demonstrates close agreement with established 1.5 T SSFP methods, offering a viable alternative for improved cardiac assessment.