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A study of optimization of the complex hyperbolic secant inversion pulses.
J Mao1, C Virapongse, J R Fitzsimmons
1Department of Radiology, University of Florida, Gainesville.
Magnetic Resonance in Medicine
|February 1, 1990
Summary
The conjugate gradient method enhances inversion slice profiles from selective pulses but reduces radiofrequency pulse amplitude variation immunity. This optimization improves profile quality at the cost of pulse robustness.
Area of Science:
- Magnetic Resonance Imaging
- Pulse Sequence Design
Background:
- Selective pulses are crucial for Magnetic Resonance Imaging (MRI) slice selection.
- Complex hyperbolic secant (CHS) pulses offer specific profile characteristics.
- Optimizing pulse performance is essential for high-quality MRI.
Purpose of the Study:
- To optimize the inversion slice profile generated by CHS selective pulses.
- To evaluate the trade-offs associated with profile optimization.
Main Methods:
- Application of the conjugate gradient (CG) method.
- Optimization of inversion slice profiles produced by CHS pulses.
Main Results:
- Achieved improved quality of the inversion slice profile.
- Observed a reduction in immunity to radiofrequency (RF) pulse amplitude variations.
Conclusions:
- The CG method effectively enhances CHS pulse inversion slice profiles.
- Profile quality improvement comes at the expense of RF pulse amplitude stability.