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Susceptibility artifacts in 2DFT spin-echo and gradient-echo imaging: the cylinder model revisited
C J Bakker1, R Bhagwandien, M A Moerland
1Department of Radiology, University Hospital Utrecht, The Netherlands.
Magnetic Resonance Imaging
|January 1, 1993
Summary
This study introduces a superior time-domain simulation method for magnetic resonance imaging (MRI) susceptibility artifacts. This approach accurately predicts distortions, improving understanding of magnetic susceptibility in MRI.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Physics
- Biomedical Engineering
Background:
- Susceptibility artifacts cause geometric and intensity distortions in MRI scans.
- Previous simulation studies offered limited precision in understanding these artifacts.
- Discrepancies between theory and experiment stemmed from inadequate theoretical approaches.
Purpose of the Study:
- To develop and validate a more accurate simulation method for susceptibility artifacts in MRI.
- To demonstrate the superiority of time-domain simulations over frequency-domain methods.
- To predict susceptibility artifacts under various experimental conditions.
Main Methods:
- Simulated magnetic susceptibility effects (chi-artifacts) in the time domain (k-space).
- Compared time-domain simulations with frequency-domain simulations.
- Validated simulation results against experimental observations using a coaxial cylinder phantom.
Main Results:
- Time-domain simulations accurately predicted susceptibility artifacts, unlike previous frequency-domain methods.
- The study identified an inadequate theoretical approach in prior work.
- Demonstrated the predictive power of time-domain simulations for various MRI sequences.
Conclusions:
- Time-domain simulation is a superior method for modeling MRI susceptibility artifacts.
- Accurate simulation is crucial for understanding and mitigating distortions in MRI.
- This approach enhances the prediction of artifacts in spin-echo and gradient-echo imaging.