Left ventricular mass quantitation using single-phase cardiac magnetic resonance imaging.

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Cardiac Diagnostics

Background:

• Magnetic resonance imaging (MRI) offers superior accuracy for measuring left ventricular (LV) mass in animal models.
• Clinical application in cardiac patients is hindered by lengthy scan times required for end-diastolic imaging across multiple slices.

Purpose of the Study:

• To evaluate the accuracy and efficiency of single-phase MRI for determining LV mass in normal subjects.
• To compare LV mass measurements from single-phase MRI with the established, time-consuming end-diastolic MRI reference standard.

Main Methods:

• Twenty healthy subjects underwent spin-echo MRI, acquiring 5 images throughout the cardiac cycle at each of 10 slice locations.
• Left ventricular (LV) mass was calculated using both single-phase and end-diastolic MRI techniques.

Main Results:

• A close correlation (r = 0.96) was observed between LV mass measured by single-phase and end-diastolic MRI.
• End-diastolic LV mass was slightly higher (average 5 g, p < 0.002) than single-phase measurements, a difference deemed clinically insignificant.
• Reversing the order of single-phase image selection improved agreement with end-diastolic MRI.

Conclusions:

• Single-phase MRI provides an accurate and time-efficient method for assessing left ventricular (LV) mass.
• This technique holds potential to overcome the limitations of traditional MRI protocols in clinical settings.
• The observed minor differences are negligible compared to the variability of other imaging modalities like echocardiography.