Related Experiment Videos
A k-space analysis of MR tagging
1Department of Electrical and Computer Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 29, 2000
Summary
This study introduces a new k-space approximation for analyzing magnetic resonance imaging (MRI) pulse sequences. This method helps in designing effective tagging sequences by focusing on z-directed magnetization (M(z)).
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Biophysics
- Medical Physics
Background:
- Traditional k-space approximations focus on transverse magnetization (M(x), M(y)) during selective excitation.
- Analysis of tagging sequences in MRI requires understanding z-directed magnetization (M(z)).
Purpose of the Study:
- To present a novel k-space approximation relating pulse sequences to residual z-directed magnetization (M(z)).
- To facilitate the analysis and design of MRI tagging sequences.
- To explore applications in selective presaturation sequences.
Main Methods:
- Developed a k-space approximation analogous to small tip-angle excitation approximations.
- Focused on the direct relationship between pulse sequence parameters and M(z) patterns.
- Applied the approximation to analyze and design tagging and presaturation sequences.
Main Results:
- The approximation accurately models the residual M(z) patterns generated by pulse sequences.
- New insights into the mechanisms of magnetization tagging were revealed.
- Demonstrated the ability to design novel tag patterns using the approximation.
Conclusions:
- The proposed k-space approximation is a valuable tool for MRI sequence analysis and design, particularly for tagging.
- It offers a new perspective on controlling and predicting z-directed magnetization.
- The method has broader applicability to other selective MRI techniques like presaturation.