MRI Movement Correction via Reference Measurement and K-Space Transformation
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Solution Overview
Problem
Magnetic resonance imaging (MRI) data is often compromised by movement artifacts due to patient movement during data acquisition, which can reduce image quality and complicate the evaluation of time-series data, especially in procedures requiring longer acquisition times.
Innovation Solution
A method for movement correction of MRI data involves performing a reference measurement at a initial time point, acquiring diagnostic image data from sub-regions of the examination region at a later time, determining movement information from both sets of data, transforming the k-space data using this information, and combining the transformed data sets to generate movement-corrected image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acquisition time of magnetic resonance measurement data is extended to improve image quality and enable time-series recording, then the temporal resolution and diagnostic value are improved, but patient movement during acquisition increases, leading to movement artifacts and reduced data quality
Solution Approach 1:
The patent applies preliminary action by acquiring a reference measurement at a first point in time before the main diagnostic image measurement. This reference data is obtained in advance and stored, then later used to correct movement artifacts in the diagnostic data acquired at subsequent time points, allowing the system to prepare correction tools before the actual diagnostic acquisition begins
Solution Approach 2:
The patent uses an intermediary approach by introducing a reference measurement as a mediator between the patient's actual position and the diagnostic image acquisition. The reference data serves as an intermediate reference frame that enables comparison and correction of positional deviations without requiring direct real-time intervention during the main diagnostic scan
2Object-affected harmful factors
If prospective movement correction methods are used to detect and correct movement during acquisition, then movement artifacts are reduced, but the device complexity and acquisition time increase
Solution Approach 1:
The patent applies copying by creating a reference copy of the examination region at a first point in time. This reference copy is then used to compare against and correct the diagnostic data acquired at later time points, allowing movement correction without requiring complex real-time detection systems during the main acquisition
Solution Approach 2:
The reference measurement is performed in advance before the main diagnostic acquisition, preparing the correction framework beforehand. This preliminary action avoids the need for complex real-time movement detection and correction systems during the actual diagnostic scan, reducing device complexity
3Object-affected harmful factors
If the magnetic resonance sequence is adapted to account for patient movement, then movement correction is improved, but the productivity and acquisition efficiency decrease
Solution Approach 1:
The patent segments the magnetic resonance acquisition into two distinct parts: a reference measurement phase and a diagnostic image measurement phase. The reference measurement is acquired first with potentially different parameters optimized for reference purposes, then the main diagnostic acquisition follows with parameters optimized for diagnostic quality, allowing each segment to be optimized independently without compromising overall efficiency
Data Source
AI summary
In a method and magnetic resonance apparatus for generating motion-corrected magnetic resonance measurement data, reference data and measurement data are acquired from multiple sub-regions of an examination region of a subject, and first and second items of movement information are respectively generated for the respective sub-regions, and motion-corrected data for the respective sub-regions is generated by transforming k-space data using the first and second items of movement information.