Quantitative assessment of left ventricular function in humans at 7 T

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Medical Diagnostics

Background:

• Cardiac magnetic resonance imaging (MRI) is crucial for assessing left ventricular (LV) function.
• Higher magnetic field strengths, such as 7 Tesla (T), offer potential for improved image quality and quantitative accuracy.
• Validation against established lower field strengths is necessary to establish clinical utility.

Purpose of the Study:

• To evaluate the quantitative accuracy of 7 T cardiac MRI for assessing LV volumes, mass, and function.
• To assess the ability of 7 T MRI to measure left ventricular diastolic filling parameters.
• To compare quantitative results from 7 T MRI with a 1.5 T MRI gold standard.

Main Methods:

• 10 healthy volunteers underwent cardiac MRI at both 7 T and 1.5 T.
• Cine short-axis series were used for LV volumes, mass, and function assessment via manual segmentation.
• Velocity-encoded MRI at the mitral valve assessed trans-mitral flow and diastolic filling.
• Intraclass correlation coefficients (ICCs) were used for agreement analysis.

Main Results:

• 7 T cardiac MRI was successful in 80% of examinations.
• LV volumes, mass, and function showed good agreement between 7 T and 1.5 T (ICCs 0.77–0.96).
• Trans-mitral stroke volume and filling rate ratios demonstrated strong agreement (ICCs 0.92 and 0.77, respectively).

Conclusions:

• Quantitative assessment of LV volumes, mass, function, and diastolic filling is feasible using 7 T cardiac MRI.
• Standardized 7 T MRI protocols provide quantitative results comparable to 1.5 T MRI.
• 7 T cardiac MRI shows promise for advanced cardiovascular diagnostics.