Magnetic Resonance Imaging Parameter Correction for Thermal Drift
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Solution Overview
Problem
During long magnetic resonance imaging (MRI) scans, temperature increases cause system performance degradation due to changes in eddy currents, B0 field, and other parameters, leading to image quality deterioration and artifacts, which existing systems struggle to monitor and correct effectively.
Innovation Solution
A magnetic resonance imaging system and method that acquires and corrects system state parameters like eddy current, gradient delay, phase shift, and center frequency using function relationships, allowing real-time monitoring and compensation for parameter variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If long scan sequence is performed, then more imaging data can be acquired, but system temperature increases causing parameter variations and image quality degradation
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring system temperature during the scan sequence and using this temperature information to dynamically adjust and correct imaging parameters. The processor acquires temperature data, determines parameter variations based on temperature changes, and applies corrections to maintain image quality throughout the extended scan duration.
Solution Approach 2:
The patent applies parameter changes by adjusting imaging parameters (such as gradient delays, phase shifts, center frequency) based on measured temperature variations. The system establishes function relationships between temperature and these parameters, then modifies the parameters in real-time to compensate for temperature-induced drift, thereby maintaining reliable image quality during long scans.
2Reliability
If real-time parameter monitoring and correction is implemented, then image quality is maintained, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling the system to automatically monitor its own temperature, determine parameter variations, and correct its imaging parameters without external intervention. The processor within the MRI system performs all correction operations autonomously using pre-established function relationships between temperature and imaging parameters, reducing the need for complex external correction systems.
Solution Approach 2:
The patent implements preliminary action by pre-establishing function relationships between temperature and imaging parameters before the scan begins. These relationships are determined in advance through calibration or measurement, allowing the system to quickly apply corrections during the scan without requiring complex real-time calculations, thereby reducing system complexity while maintaining image quality.
Data Source
AI summary
A magnetic resonance imaging system includes a processor. The processor is configured to acquire a variation of a first system state parameter during a scanning process of the magnetic resonance imaging system, determine, according to the variation of the first system state parameter, a variation of a second system state parameter on the basis of a function relationship between the first system state parameter and the second system state parameter, and correct the magnetic resonance imaging system on the basis of the variation of at least one of the first system state parameter and the second system state parameter.