Shim Coil Parameter Optimization for MRI Magnetic Field Uniformity
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Solution Overview
Problem
Current shim coils in magnetic resonance systems do not adequately address the issue of uneven magnetic field distribution, leading to image artifacts in magnetic resonance imaging due to non-uniformity or inhomogeneity of the magnetic field.
Innovation Solution
A shimming method and device that adjusts shim coil parameters, such as the number of channels, size, spatial position, current magnitude, and number of turns, using a preset magnetic field distribution model and algorithms like the particle swarm optimization, to achieve uniformity of the static magnetic field, thereby improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional shim coils are added to the magnetic resonance system, then the magnetic field uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes shim coil parameters including current magnitude, number of turns, spatial position, and coil geometry to achieve improved magnetic field uniformity without adding excessive complexity. By adjusting these parameters systematically, the patent resolves the contradiction between achieving uniformity and maintaining system simplicity.
Solution Approach 2:
The patent employs dynamic optimization methods where shim coil parameters are adjusted based on measured magnetic field characteristics. This dynamic approach allows the system to achieve optimal uniformity for different imaging scenarios without requiring a permanently complex fixed configuration.
2Manufacturing precision
If shim coil parameters are optimized using advanced algorithms, then the shimming performance is improved, but the computation time increases
Solution Approach 1:
The patent pre-calculates and stores optimal shim coil parameters for common imaging scenarios and anatomical regions. When performing magnetic resonance imaging, the system can quickly retrieve pre-computed parameters rather than performing full optimization calculations in real-time, thus maintaining high shimming performance while reducing computation time.
Solution Approach 2:
The patent replaces complex real-time iterative optimization calculations with pre-computed lookup tables and simplified estimation algorithms. This substitution maintains accurate shimming performance while dramatically reducing the computational burden and time required during actual imaging operations.
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 method ensures uniformity of the static magnetic field distribution, enhancing the magnetic resonance imaging effect by reducing non-uniformity and improving the shimming performance of the magnetic resonance system.
Implementation Method 1
obtaining object static magnetic field distribution information corresponding to a target object, where the object static magnetic field distribution information is the static magnetic field distribution information of the target object under the action of a main magnet of a magnetic resonance system
Implementation Method 2
according to Biot-Savart law, determining the magnetic field distribution information of the shim coil magnetic field distribution model
Data Source
AI summary
A shimming method and device, an electronic device, and a storage medium are disclosed. The shimming method includes: obtaining object static magnetic field distribution information corresponding to a target object, the object static magnetic field distribution information including the static magnetic field distribution information of the target object under the action of a main magnet of a magnetic resonance system; determining a target static magnetic field based on the object static magnetic field distribution information and a preset shim coil magnetic field distribution model; and adjusting at least one shim coil parameter in the shim coil magnetic field distribution model until a magnetic field uniformity of the target static magnetic field satisfies a preset condition, and accordingly obtaining at least one target shim coil parameter.