Permanent Magnet Shim Patterning for MRI B0 Field Correction
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Solution Overview
Problem
Conventional MRI systems, particularly high-field systems, face challenges due to high costs, limited availability, and complex setup requirements, including the need for expensive superconducting magnets and cryogenic equipment, which limits their use to specialized facilities. Additionally, existing shimming techniques are time-consuming and require significant manual effort to correct magnetic field deviations, making them inefficient for low-field MRI applications.
Innovation Solution
The development of a method and system for producing a permanent magnet shim that corrects the B0 magnetic field by determining deviations and applying a predetermined magnetic pattern to magnetic material using automated techniques, allowing for improved field homogeneity and flexibility in orientation, reducing the need for expensive and complex equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional high-field MRI systems are used to improve image resolution and scan time, then imaging quality is improved, but cost and device complexity increase significantly
Solution Approach 1:
The patent replaces expensive, complex superconducting magnets with permanent magnets that are simpler, cheaper, and do not require cryogenic equipment. The permanent magnets provide sufficient field strength for MRI without the need for costly high-field infrastructure, effectively substituting a cheap, simple solution for an expensive, complex one
Solution Approach 2:
The patent changes the magnetic field strength parameter from conventional high-field (1.5T or 3T) to low-field (0.2T or lower) using permanent magnets. This parameter change allows the system to achieve adequate imaging performance while dramatically reducing cost and complexity
2Manufacturing precision
If manual shimming techniques are used to correct magnetic field deviations, then field homogeneity is improved, but time consumption and operational complexity increase
Solution Approach 1:
The patent incorporates shimming magnets and corrective elements during the manufacturing and assembly process rather than requiring post-installation manual adjustment. The shimming components are pre-positioned and pre-adjusted to compensate for magnetic field inhomogeneities, eliminating time-consuming manual shimming operations
Solution Approach 2:
The patent uses passive shimming elements that automatically correct field inhomogeneities without requiring manual intervention. The shimming magnets are strategically positioned to self-correct magnetic field deviations, making the system self-adjusting and eliminating the need for operator expertise and time-consuming manual procedures
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
This approach enables more efficient and cost-effective shimming for MRI systems, particularly in low-field contexts, by automating the process of correcting magnetic field deviations, thereby increasing the availability and reducing the operational costs of MRI technology.
Implementation Method 1
determining deviation of the B0 magnetic field from a desired B0 magnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation
Implementation Method 2
applying the magnetic pattern to the magnetic material to produce the permanent magnet shim
Data Source
AI summary
A method of producing a permanent magnet shim configured to improve a profile of a B0 magnetic field produced by a B0 magnet is provided. The method comprises determining deviation of the B0 magnetic field from a desired B0 magnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation, and applying the magnetic pattern to the magnetic material to produce the permanent magnet shim. According to some aspects, a permanent magnet shim for improving a profile of a B0 magnetic field produced by a B0 magnet is provided. The permanent magnet shim comprises magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve the profile of the B0 magnetic field.