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Analysis of the higher-order echoes in SSFP
Magnetic Resonance in Medicine
|May 1, 1991
Summary
This study reveals higher-order echoes in steady-state free precession (SSFP) imaging using Fourier analysis. These findings enhance understanding of SSFP phenomena beyond previously known echoes.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Signal Processing
Background:
- Steady-state free precession (SSFP) is a key MRI technique.
- Understanding SSFP signal behavior is crucial for image quality.
Purpose of the Study:
- To investigate higher-order echoes in SSFP beyond known phenomena.
- To provide a comprehensive explanation of SSFP echo generation.
Main Methods:
- Applied Fourier analysis to periodically distributed transverse magnetizations in SSFP.
- Derived a general description of SSFP transverse magnetization.
- Expanded echo time-independent terms using Fourier series.
Main Results:
- Identified numerous higher-order echoes in SSFP.
- Explained previously known echoes like FISP and CE-FAST within this framework.
- Demonstrated detailed agreement between simulations and experimental results.
Conclusions:
- Fourier analysis provides a unified framework for understanding SSFP echoes.
- The existence of higher-order echoes impacts SSFP signal interpretation.
- This work advances the theoretical understanding and practical application of SSFP MRI.