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Elimination of Nyquist ghosts in MRI by using fast linogram imaging
Journal of Magnetic Resonance Imaging : JMRI
|December 24, 1997
Summary
Timing inaccuracies in echo-planar imaging (EPI) cause Nyquist ghosts. A novel radial scanning method eliminates these ghosts and allows for simple postprocessing correction, improving image quality.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Image Reconstruction
- Signal Processing
Background:
- Conventional echo-planar imaging (EPI) suffers from Nyquist ghosts due to timing inaccuracies between even and odd echoes.
- These ghosting artifacts degrade image quality and complicate interpretation in MRI scans.
Purpose of the Study:
- To develop and implement a fast radial scanning method to eliminate Nyquist ghosts in EPI.
- To enable simple postprocessing correction for timing inaccuracies.
Main Methods:
- A fast radial scanning sequence was designed utilizing linogram sampling geometry.
- The method was implemented and tested for ghosting artifacts and timing correction efficacy.
Main Results:
- The implemented radial scanning method demonstrated no ghosting effects.
- Simple postprocessing steps effectively corrected for timing inaccuracies before image reconstruction.
Conclusions:
- The proposed fast radial scanning method effectively suppresses Nyquist ghosts in EPI.
- This technique offers a robust solution for improving image fidelity in MRI by addressing timing-related artifacts.