Real-Time MRI Motion Detection With Inserted Auxiliary Sequences
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Solution Overview
Problem
Existing magnetic resonance imaging (MRI) systems struggle to detect and correct for motion artifacts in real-time during scanning, which can degrade image quality due to factors like field drift, temperature changes, and involuntary movements.
Innovation Solution
A method and system for motion detection in MRI that uses an auxiliary sequence with multiple sub-sequences inserted at different positions to obtain auxiliary magnetic resonance data, allowing for real-time determination of motion state information by processing this data to adjust imaging scans accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion detection is performed using traditional MRI sequences, then motion artifacts can be detected, but the scanning time increases and image quality deteriorates due to additional sequences
Solution Approach 1:
The patent combines motion detection functionality with the main imaging sequence by inserting auxiliary sub-sequences within the existing imaging framework. This integration allows motion detection to occur simultaneously with image acquisition without requiring separate dedicated motion detection sequences, thereby reducing total scanning time while maintaining motion detection capability
Solution Approach 2:
The auxiliary sequence is designed to serve multiple functions: it detects motion artifacts, provides phase reference information for correction, and maintains compatibility with the main imaging sequence. This multi-functionality allows a single sequence structure to address both imaging and motion detection needs, improving efficiency
2Reliability
If auxiliary sequences are inserted in the MRI scanning process, then real-time motion detection is enabled, but the sequence complexity increases
Solution Approach 1:
The auxiliary sequence is divided into multiple auxiliary sub-sequences that are inserted at different positions within the main imaging sequence. Each sub-sequence performs a specific function (e.g., phase reference, motion encoding), and their distributed placement throughout the imaging sequence reduces the complexity burden at any single point while collectively providing comprehensive motion detection
Solution Approach 2:
The patent adjusts parameters of the auxiliary sequences (such as flip angle, timing, gradient strength) to optimize their performance within the constraints of the main imaging sequence. By carefully controlling these parameters, the system achieves reliable motion detection while minimizing the disruptive impact on the overall sequence structure
3Measurement precision
If multiple auxiliary sub-sequences are used for motion detection, then motion detection precision improves, but the data processing complexity increases
Solution Approach 1:
The patent introduces intermediate processing steps that bridge the auxiliary sub-sequences and the main imaging data. These intermediaries (such as phase difference calculation, motion parameter estimation) simplify the integration of multiple auxiliary sequences by providing standardized processing interfaces, thereby reducing the overall data processing complexity while maintaining high precision motion detection
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
Enhances the quality of MRI scans by enabling real-time detection and correction of motion artifacts, reducing the need for re-acquisition of data and improving image clarity.
Implementation Method 1
Magnetic Resonance Imaging (MRI) is an imaging technology widely used in the medical field
Data Source
AI summary
The present disclosure provides methods, and systems for motion detection in magnetic resonance imaging. The method may include obtaining auxiliary magnetic resonance data of a target object by scanning the target object using an auxiliary sequence inserted in at least two imaging sub-sequences in a magnetic resonance imaging process of the target object, wherein the auxiliary sequence includes a plurality of auxiliary sub-sequences inserted at different positions in the at least two imaging sub-sequences; and determining, based on the auxiliary magnetic resonance data, motion state information of a region of interest of the target object.