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Updated: Jun 12, 2026
10:53
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
Phase-contrast velocimetry with simultaneous fat/water separation.
Kevin M Johnson1, Oliver Wieben, Alexey A Samsonov
1Department of Medical Physics, University of Wisconsin, Madison, Wisconsin 53705-2275, USA. kmjohnson3@wisc.edu
Magnetic Resonance in Medicine
|June 1, 2010
Summary
This study introduces a new method combining chemical shift imaging with phase-contrast MRI to reduce fat artifacts in velocity imaging. This improves image quality and velocity measurements, especially for body imaging applications.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging Physics
- Biomedical Engineering
Background:
- Phase-contrast MRI (PC-MRI) offers high-resolution angiographic velocity imaging, often enhanced by non-Cartesian k-space sampling.
- Acquisitions are susceptible to artifacts from magnetic field inhomogeneities and chemical shift, particularly from fat in body imaging.
- Fat artifacts degrade image quality, introduce velocity measurement errors, and hinder self-calibrated static field heterogeneity corrections.
Purpose of the Study:
- To develop and evaluate a novel method to mitigate fat-induced artifacts in PC-MRI.
- To enable accurate velocity measurements and facilitate self-calibrated corrections in the presence of significant fat content.
- To improve the quality and reliability of PC-MRI for body imaging applications.
Main Methods:
- A combined chemical shift imaging and phase-contrast velocimetry technique was developed.
- Nonlinear least-squares estimation was employed to simultaneously determine velocity, fat, and water signals.
- A symmetric dual-echo sequence was implemented to minimize scan time penalties.
Main Results:
- The proposed method demonstrated a reduced influence of fat on velocity images.
- Initial phantom and volunteer studies validated the effectiveness of the technique.
- The approach facilitates the application of self-calibrated amplitude of static field heterogeneity corrections.
Conclusions:
- The combination of chemical shift imaging and PC-MRI effectively reduces fat artifacts.
- This technique enhances the accuracy of velocity measurements in fat-rich environments.
- The method holds promise for improving body imaging using PC-MRI.
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