MRI Phase Correction via Echo Signal Curve Shifting
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Solution Overview
Problem
Magnetic resonance imaging (MRI) technologies face challenges in reconstructing images due to unsynchronized phases of Spin Echo and Stimulated-Echo signals, leading to image darkening and artifacts, particularly in Turbo Spin Echo and Echo Planar Imaging sequences, where pre-scanning corrections are complex and prone to errors, especially when using multiple channels.
Innovation Solution
A method is introduced to determine and correct unsynchronized phases by shifting the signal curve of echo signals across multiple channels, determining one-order and zero-order phase correction values based on phase standard deviations, which improves the accuracy and robustness of phase corrections, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-scanning corrections are used to correct unsynchronized phases, then image quality can be improved, but the correction process becomes complex and prone to errors
Solution Approach 1:
The patent extracts and separately processes different phase components (one-order phase differences and zero-order phase differences) from the echo signals. By separating the correction of unsynchronized phases into distinct computational steps for different channel groups, the method reduces the complexity of the overall correction process while maintaining accuracy.
Solution Approach 2:
The patent divides all channels into multiple groups and processes each group separately to determine one-order phase differences. This segmentation approach breaks down the complex multi-channel phase correction into manageable segments, reducing computational complexity and error propagation while improving correction reliability.
2Quantity of substance
If multiple channels are used for imaging, then signal coverage is improved, but phase synchronization becomes more difficult and error-prone
Solution Approach 1:
The patent divides multiple channels into several groups and processes each group independently to determine one-order phase differences. This segmentation prevents error accumulation across all channels and maintains phase synchronization accuracy even as the number of channels increases.
Solution Approach 2:
The patent applies phase correction selectively to different channel groups with different correction strategies (one-order phase differences for some groups, zero-order for others). This partial correction approach maintains precision while managing the complexity introduced by multiple channels.
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 improves the consistency and correctness of phase corrections, resulting in better image brightness and quality by filtering out invalid channels and using a curve fitting method to determine optimal displacement, effectively addressing the issues of image darkening and artifacts.
Implementation Method 1
Magnetic resonance imaging is a technology by which imaging is performed according to resonance characteristics of a bio-magnetic nucleon in a magnetic field
Data Source
AI summary
A magnetic resonance imaging (MRI) method is provided. The method includes: a first echo signal and a second echo signal generated from each of channels of a MRI device are acquired by performing a pre-scanning according to an imaging sequence; a correction displacement with which an imaging phase consistency is maximum is determined by shifting a signal curve of the second echo signal for each of the channels for a plurality of times; a one-order phase correction value and a zero-order phase correction value for the channels are determined under the imaging sequence according to the correction displacement; a formal scanning is performed according to the imaging sequence to obtain scanning data; and a phase correction is performed on the scanning data according to the one-order phase correction value and the zero-order phase correction value to obtain target scanning data for reconstructing an image.