MRI Navigator Echo Correction for Respiratory Motion Artifacts
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Solution Overview
Problem
Conventional dynamic MRI techniques have limited accuracy and efficiency due to physiological motion, such as respiratory and cardiac motion, which affects the imaging resolution and requires multiple scan interruptions, especially in abdominal scans where breath-holding is necessary.
Innovation Solution
An MRI system that collects k-space data during multiple acquisition periods, determines position information of a reference region, and corrects the data based on this information to generate a dynamic MR image sequence, reducing the impact of physiological motion by using navigator data and imaging data correction techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If breath-holding is used during abdominal MRI scan, then motion artifacts are reduced, but the imaging duration is limited and imaging resolution is low
Solution Approach 1:
The system uses navigator echoes to continuously monitor the position of the diaphragm and provides real-time feedback about respiratory motion. This feedback is used to dynamically adjust the imaging process, allowing the scanner to acquire images at optimal moments in the respiratory cycle without requiring the patient to hold their breath, thereby extending the effective imaging duration while maintaining image quality
Solution Approach 2:
The system performs preliminary navigation scans to map the respiratory motion trajectory before the main imaging sequence. This preliminary action allows the system to predict optimal imaging windows and prepare correction parameters in advance, enabling continuous imaging without breath-holding while maintaining the reliability of the images
2Reliability
If multiple scan triggers are used to monitor respiratory status, then motion effects are reduced, but scanning efficiency is very low and the scan is interrupted multiple times
Solution Approach 1:
The system implements continuous navigator echo acquisition throughout the entire imaging process, providing uninterrupted monitoring of respiratory motion. This continuous action eliminates the need for multiple discrete scan triggers and interruptions, maintaining image accuracy while significantly improving scanning efficiency by allowing the main imaging sequence to proceed continuously
Solution Approach 2:
The system merges the navigator echo acquisition with the main imaging sequence, so that motion monitoring and image acquisition occur simultaneously rather than as separate interrupted processes. This combination eliminates scan interruptions while maintaining both the accuracy benefits of motion monitoring and the efficiency of continuous scanning
Data Source
AI summary
An MRI method and system may be provided. A plurality of sets of k-space data of a region of interest (ROI) of a subject may be obtained. Each of the plurality of sets of k-space data may be collected during one of a plurality of acquisition periods after an MR sequence is applied on the subject. Then, for each of the plurality of sets of k-space data, position information of a reference region during the corresponding acquisition period may be determined based on the set of k-space data. The set of k-space data may be corrected based on the position information of the reference region. Further, a dynamic MR image sequence may be generated based on the plurality sets of corrected k-space data.