Blood flow imaging by cine magnetic resonance

Area of Science:

• Cardiovascular Imaging
• Biomedical Engineering
• Magnetic Resonance Imaging

Background:

• Assessing blood flow is crucial for diagnosing cardiovascular diseases.
• Traditional methods like Doppler ultrasound have limitations.
• Nuclear magnetic resonance (NMR) offers potential for non-invasive flow measurement.

Purpose of the Study:

• To describe a novel whole-body nuclear magnetic resonance (NMR) technique for measuring blood flow.
• To demonstrate its ability to overcome signal loss issues in previous NMR flow studies.
• To validate its clinical applicability in cardiovascular assessments.

Main Methods:

• Utilized a whole-body NMR imaging technique combining even echo rephasing with a field echo sequence.
• Employed modified gradient profiles to measure flow velocity in desired directions via phase mapping.
• Implemented fast repetition sequences for rapid acquisition of cardiac cycle flow data.

Main Results:

• The technique successfully measured blood flow in the heart chambers and great vessels.
• Femoral artery flow measurements correlated well with Doppler ultrasound.
• Velocity-dependent phase shifts were effectively displayed using phase mapping.

Conclusions:

• The described NMR technique provides accurate and rapid blood flow measurement.
• It overcomes signal loss challenges, offering a significant advancement in cardiovascular assessment.
• This method is readily applicable with standard imaging equipment for clinical use.