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Updated: Feb 6, 2026
11:36
A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
Published on: July 3, 2016
11.3K
Dynamics of magnetization under stimulus-induced rotary saturation sequence.
Hiroyuki Ueda1, Hiroaki Seki1, Yosuke Ito1
1Department of Electrical Engineering, Graduate School of Engineering, Kyoto University, Kyoto-daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 11, 2018
Summary
We developed an analytical solution for stimulus-induced rotary-saturation preparation to precisely measure oscillating magnetic fields using MRI. This method enhances magnetization dynamics understanding and simulation accuracy, improving magnetic field measurement in MRI.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Physics
- Biophysics
Background:
- Accurate measurement of oscillating magnetic fields is crucial for advanced MRI applications.
- Existing simulation techniques like Runge-Kutta can be computationally intensive.
- Understanding magnetization dynamics is key to optimizing MRI sequences.
Purpose of the Study:
- To derive an analytical solution for stimulus-induced rotary-saturation preparation.
- To provide a comprehensive mathematical model for magnetization dynamics.
- To enable efficient simulations without sequential-calculation methods.
Main Methods:
- Formulated magnetization dynamics using the Bloch equation.
- Introduced a rotating frame and approximations for a homogeneous differential equation.
- Derived an analytical solution and validated it through experimental investigation and curve fitting.
Main Results:
- An analytical solution for rotary-saturation preparation was successfully derived.
- Two distinct dynamic modes were identified based on the target oscillating magnetic field.
- The analytical solution demonstrated strong agreement with experimental data.
Conclusions:
- The derived analytical solution accurately describes magnetization dynamics for oscillating magnetic field measurements.
- Experimental data highlight the need for sequences that compensate for B0 and B1 spatial inhomogeneity.
- Optimizing RF pulse sequences is essential for accurate spin phase rewinding and improved MRI measurements.
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