Cardiac Cine MRI Using a Commercially Available 0.55-T Scanner

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging (MRI)
• Cardiac Function Assessment

Background:

• Standard cardiac cine MRI utilizes 1.5-T scanners for assessing left ventricular (LV) and right ventricular (RV) function.
• Low-field strength MRI scanners (0.55 T) offer potential advantages in accessibility and cost but require validation for quantitative cardiac analysis.

Purpose of the Study:

• To compare quantitative biventricular volumetric and functional parameters derived from a 0.55-T low-field cardiac cine MRI scanner against a standard 1.5-T scanner.
• To evaluate the diagnostic equivalence of 0.55-T cardiac MRI for clinical cardiovascular assessments.

Main Methods:

• Prospective study involving healthy volunteers and patients undergoing same-day cine imaging on both 0.55-T and 1.5-T MRI scanners.
• Volumetric and functional parameters were assessed by two independent expert readers.
• Data analysis included Bland-Altman plots to visualize agreement and calculate mean correlation and deviation between the two systems.

Main Results:

• Very strong mean correlation (r = 0.98) was observed between the 0.55-T and 1.5-T systems for both healthy volunteers and patients.
• Average deviation in LV and RV parameters was minimal, reported as 1.6% in volunteers and 1.1% in patients, indicating high agreement.
• Comparable quantitative biventricular volumetric and functional parameters were achieved with the 0.55-T scanner, provided acquisition time was doubled.

Conclusions:

• Cardiac cine MRI performed on a 0.55-T low-field scanner yields results comparable to those obtained with a 1.5-T scanner for biventricular parameters.
• The 0.55-T system demonstrates high reliability and agreement for quantitative assessment of cardiac function and volume.
• 0.55-T cardiac MRI is a viable alternative to 1.5-T MRI for cardiovascular imaging, with careful consideration of acquisition protocols.