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MR imaging of flow through tortuous vessels: a numerical simulation
R van Tyen1, D Saloner, L D Jou
1Department of Radiology, University of California at San Francisco.
Magnetic Resonance in Medicine
|February 1, 1994
Summary
A new computer simulation method generates Magnetic Resonance Angiography (MRA) images from blood flow data. This technique aids in understanding MRA artifacts in complex blood vessel geometries.
Area of Science:
- Medical Imaging
- Computational Fluid Dynamics
- Biomedical Engineering
Background:
- Magnetic Resonance Angiography (MRA) is crucial for visualizing blood vessels.
- Accurate MRA imaging requires understanding complex blood flow dynamics.
- Simulating MRA requires integrating fluid dynamics with MR imaging principles.
Purpose of the Study:
- To develop a novel computer simulation technique for calculating MRA images.
- To model blood flow in realistic 2D curving and branching vessel geometries.
- To gain insight into MRA artifacts.
Main Methods:
- Utilized fluid dynamic calculations to determine flow streamlines.
- Employed MR simulations to generate images based on specific pulse sequence parameters.
- Simulated steady flow in carotid bifurcation and siphon geometries using a gradient echo sequence.
Main Results:
- The simulation technique successfully generated MRA images reflecting clinical observations.
- Simulations illustrated major features seen in time-of-flight MRA studies.
- Key MRA artifacts, including displacement, signal pile-up, truncation, and intravoxel phase dispersion, were reproduced.
Conclusions:
- The developed simulation technique provides a valuable tool for MRA image analysis.
- This method offers insights into the origins of common MRA artifacts.
- The simulation approach can enhance the interpretation and optimization of MRA studies.