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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging

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Analysis of complex cardiovascular flow with three-component acceleration-encoded MRI.

Alex J Barker¹, Felix Staehle, Jelena Bock

¹Department of Radiology, Medical Physics, University Medical Center, Freiburg. alexander.barker@uniklinik-freiburg.de

Magnetic Resonance in Medicine

|May 19, 2011

Summary

This study introduces a novel magnetic resonance imaging (MRI) technique for measuring blood acceleration, offering more accurate and less noisy results than traditional methods for assessing cardiac flow dynamics.

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Area of Science:

Biomedical Engineering
Cardiovascular Imaging
Fluid Dynamics

Background:

Blood acceleration fields provide functional information on cardiac performance, pressure gradients, and local flow derangement.
Standard velocity-encoded phase contrast magnetic resonance imaging (PC-MRI) can derive acceleration, but with limitations.

Purpose of the Study:

To examine a 2D and 3D phase contrast sequence optimized for efficient, time-resolved, three-directional blood acceleration encoding.
To compare in vitro and in vivo acceleration measurements with velocity-derived acceleration.

Main Methods:

Developed and optimized a 2D and 3D phase contrast MRI sequence for blood acceleration.
Compared phantom acceleration measurements to velocity-derived acceleration.
Acquired in vivo 2D acceleration maps in healthy volunteers and evaluated a 4D acceleration sequence in a patient.

Main Results:

Phantom MRI acceleration measurements were more accurate (RMSE 2.2 vs. 5.1 m/s²) and less noisy (σ 0.9 vs. 13.6 m/s²) than velocity-derived acceleration.
In vivo acceleration mapping revealed signal voids correlating with complex flow events like vortex formation.
4D acceleration data shows potential for new insights into complex cardiovascular flow phenomena.

Conclusions:

The optimized MRI sequence provides accurate and less noisy blood acceleration measurements.
Acceleration mapping can identify complex flow phenomena in the cardiovascular system.
4D acceleration imaging holds promise for advancing the understanding of blood flow dynamics.