Magnetic Resonance Scanner Homogeneity Test Apparatus
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Solution Overview
Problem
Magnetic resonance scanners face challenges in determining the homogeneity of magnetic fields, leading to distorted or absent MR signals due to local deviations in the basic and gradient fields, which affect image quality.
Innovation Solution
A method using at least two test vessels arranged on a test plane perpendicular to the axis-defined direction, with measurement data recorded at multiple positions to determine deviations in magnetic field homogeneity, allowing for the identification of shim elements to improve field homogeneity and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple measurement positions are used to determine magnetic field homogeneity, then measurement precision is improved, but device complexity and measurement time increase
Solution Approach 1:
The measurement process is segmented into two distinct phases: first measuring at multiple positions within the examination region, then measuring at outer positions. This segmentation allows comprehensive homogeneity assessment while organizing the complex measurement process into manageable stages, reducing overall system complexity.
Solution Approach 2:
The patent performs preliminary measurements at multiple positions within the examination region before conducting outer position measurements. This preliminary action establishes baseline data that simplifies subsequent homogeneity calculations and reduces the complexity of the overall measurement system by pre-characterizing the field distribution.
2Measurement precision
If multiple measurement positions are used to determine magnetic field homogeneity, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary measurements at multiple positions within the examination region before conducting outer position measurements. This preliminary action establishes baseline data that simplifies subsequent homogeneity calculations and reduces the overall measurement time by pre-characterizing the field distribution in the most critical region.
Solution Approach 2:
The measurement process is segmented into two distinct phases: first measuring at multiple positions within the examination region, then measuring at outer positions. This segmentation allows comprehensive homogeneity assessment while organizing the complex measurement process into manageable stages, reducing overall measurement time.
3Manufacturing precision
If shim elements are added to improve magnetic field homogeneity, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by placing shim elements at specific locations within the examination region based on measured field deviations. Rather than uniformly modifying the entire system, shim elements are strategically positioned to correct local inhomogeneities, improving field homogeneity while minimizing overall system complexity.
Solution Approach 2:
The patent implements an automated shim element positioning system that uses measured field data to determine optimal shim locations and configurations. This self-service approach allows the system to automatically adjust and optimize its own magnetic field homogeneity without requiring complex external calibration procedures or manual intervention.
Data Source
AI summary
In a method and test apparatus for determining a deviation in the homogeneity of a basic magnetic field of a magnetic resonance scanner, test vessels are positioned in a test plane that first and second positions along a direction in the scanner, and measurement data are acquired with the test vessels at said respective positions. The acquired measurement data are provided to a processor, wherein a deviation of the homogeneity of the basic magnetic field is determined based thereon.