MRI Motion Correction via Dynamic Coordinate System Updates
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Solution Overview
Problem
Existing MRI techniques face challenges in maintaining the alignment of measurement volumes with the desired anatomy due to object motion, leading to suboptimal image quality and increased healthcare costs, as the reference pose for motion correction is defined per scan and may change between scans, requiring redefinition and potentially necessitating repeated scans.
Innovation Solution
A method for automatically updating the planning of measurement volumes using a reference pose and coordinate system that remains consistent across scans, utilizing pose change information to calculate a new coordinate system and maintain alignment with the anatomy, allowing for coherent imaging data across multiple scans and sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference pose is defined per scan, then the motion correction can be performed for each individual scan, but the reference pose may differ between consecutive scans requiring redefinition and potentially repeated scans
Solution Approach 1:
The patent applies preliminary action by establishing a single reference pose at the beginning of the examination session using the scout image, before any diagnostic scans are performed. This preliminary reference pose serves as a stable foundation for all subsequent motion corrections throughout the entire examination, eliminating the need to redefine the reference pose for each scan and preventing the need for repeated scans due to misalignment.
2Manufacturing precision
If the reference pose is redefined for each scan, then the measurement volumes can be aligned with the current anatomy, but the planning and execution of the examination becomes more complex and time-consuming
Solution Approach 1:
The patent applies universality by creating a single reference pose that serves multiple functions throughout the entire examination session. This universal reference pose is used for motion correction in all diagnostic scans, for tracking anatomy changes over time, and for maintaining consistent measurement volume planning, thereby simplifying the examination procedure while preserving alignment precision.
3Ease of manufacture
If the measurement volumes are planned based on the scout image, then the initial positioning can be established, but the positions may become misaligned if the subject moves between acquiring the scout image and executing the diagnostic measurement
Solution Approach 1:
The patent applies feedback by continuously monitoring the subject's position during the examination using navigators or other motion detection techniques. This feedback information is used to dynamically adjust the measurement volumes relative to the fixed reference pose, ensuring that the measurement volumes remain aligned with the current anatomy even when the subject moves between the scout image acquisition and diagnostic measurement execution.
Data Source
AI summary
A method for automatically updating planning of measurement volumes as a function of object motion during MRI examination of an object in which the planning images a specific subject/object anatomy by MRI, includes defining an object reference pose and a reference coordinate system for the reference pose at a time during MRI examination, with the reference coordinate system being used for planning the measurement volumes. During examination, information is obtained about an object pose change between a current object pose at the time and the reference pose. For each subsequent scan or single acquisition of imaging data during examination, pose change information is used for calculating a new coordinate system for the current pose and updating the planning of measurement volumes as a function of the new coordinate system so the imaged object anatomy remains the same throughout the scans or acquisitions of imaging data irrespective of object motion.