MRI Fat Suppression RF Pulse Flip Angle Optimization
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Solution Overview
Problem
Existing fat suppression techniques in MRI are sensitive to B1 inhomogeneity, leading to inconsistent and ineffective fat suppression, which affects imaging quality.
Innovation Solution
A system and method that determine flip angles for a combined fat suppression RF pulse, including a first and second fat suppression RF pulse, based on reference scanning parameters to reduce sensitivity to B1 inhomogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fat suppression RF pulse is applied to suppress fat signals, then fat suppression effectiveness is improved, but sensitivity to B1 inhomogeneity increases leading to inconsistent suppression
Solution Approach 1:
The fat suppression RF pulse is divided into multiple segments (first fat suppression RF pulse and second fat suppression RF pulse) with different flip angles. This segmentation allows each pulse to contribute differently to fat suppression, reducing the overall sensitivity to B1 inhomogeneity while maintaining suppression effectiveness.
Solution Approach 2:
The invention changes the parameter of flip angle by determining optimal flip angles for multiple fat suppression RF pulses based on scanning parameters. By adjusting these parameters, the system achieves reduced sensitivity to B1 inhomogeneity while maintaining effective fat suppression.
2Stability of the object's composition
If multiple fat suppression RF pulses are used to reduce B1 inhomogeneity sensitivity, then fat suppression consistency is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary determination of optimal flip angles for multiple fat suppression RF pulses based on scanning parameters before actual image acquisition. This preliminary action simplifies the implementation by pre-calculating the necessary parameters, reducing the complexity during the actual imaging process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution improves the consistency and effectiveness of fat suppression, resulting in more homogeneous fat signal suppression across varying B1 inhomogeneity conditions, thereby enhancing MRI image quality.
Implementation Method 1
magnetic resonance imaging (MRI)... measuring a nuclear magnetic resonance signal... fat suppression radio frequency (RF) pulse may be applied... excitation RF pulse
Data Source
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AI summary
A system includes a storage device storing a set of instructions and a processor in communication with the storage device. When executing the instructions, the processor is configured to cause the system to obtain one or more scanning parameters. The processor is also configured to cause the system to determine a first flip angle of a first fat suppression RF pulse and a second flip angle of a second fat suppression RF pulse. The processor is further configured to cause the system to scan a subject by applying an RF pulse sequence including the first fat suppression RF pulse, the second fat suppression RF pulse, and an excitation RF pulse. The processor is also configured to cause the system to receive magnetic resonance signals based on the scanning of the subject and reconstructing an image of the subject based on the MR signals.