Magnetic resonance real-time imaging for the evaluation of left ventricular function

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Cardiac Function Assessment

Background:

• Conventional cardiac MRI requires breath-holding and ECG triggering, limiting its applicability.
• Ultrafast imaging sequences and gradient systems enable real-time image acquisition.

Purpose of the Study:

• To evaluate the accuracy and variability of new real-time cardiac MRI techniques for assessing left ventricular function.
• To compare ultrafast imaging methods with conventional turbo-gradient echo techniques.

Main Methods:

• Assessed left ventricular function in 21 patients using turbo-gradient echo, echo-planar imaging (EPI), and a novel real-time imaging technique.
• Compared end-diastolic volume, end-systolic volume, left ventricular mass, and ejection fraction.
• Determined inter- and intraobserver variability for each technique.

Main Results:

• Real-time imaging provided sufficient quality for automated contour detection in most patients.
• Results were comparable to conventional turbo-gradient echo, with minor tendencies for over/underestimation of volumes and ejection fraction.
• High correlations (0.89-0.98) were observed between EPI/real-time imaging and turbo-gradient echo for volumetric and mass measurements.
• Low inter- and intraobserver variability was found across all techniques.

Conclusions:

• Real-time cardiac MRI enables accurate left ventricular function assessment without ECG triggering.
• This technique significantly reduces scan times.
• Further research is needed to assess its utility for detecting wall motion abnormalities and imaging patients with atrial fibrillation.