MRI Re-Measurement Control Using Dummy Scans After Body Motion
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Solution Overview
Problem
Existing MRI techniques struggle with artifacts caused by body movement during imaging, leading to prolonged imaging times and the inability to produce diagnostically useful images, as conventional methods like dummy scans do not effectively address the unstable longitudinal magnetization state post-body movement.
Innovation Solution
Incorporating a dummy scan with RF pulse irradiation before re-measuring k-space data affected by body movement, optimizing the period and conditions of the dummy scan to quickly restore the steady state and minimize re-measurement time, thereby reducing artifacts and imaging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If body movement correction techniques are applied to remove effects of body movement, then image quality is improved, but imaging time is prolonged due to re-measurement requirements
Solution Approach 1:
The system performs preliminary detection of body movement during the imaging process. When body movement is detected, the system identifies affected k-space data regions and triggers re-measurement only for those specific regions rather than the entire k-space, thereby preventing image quality degradation while minimizing additional imaging time
Solution Approach 2:
The invention applies body movement correction selectively to specific regions in k-space that are affected by body movement, rather than uniformly processing all k-space data. This localized correction approach improves image quality in affected areas while avoiding unnecessary re-measurement of unaffected regions, thus reducing overall imaging time
2Stability of the object's composition
If dummy measurement is performed to return longitudinal magnetization to steady state, then magnetization stability is improved, but re-measurement time is extended
Solution Approach 1:
Instead of performing a complete dummy scan that covers the entire k-space, the system applies partial dummy measurement only to the specific k-space regions affected by body movement. This partial action is sufficient to restore longitudinal magnetization stability in the affected regions while minimizing the time penalty associated with dummy measurement
3Measurement precision
If complete re-measurement of k-space data is performed after body movement, then image accuracy is improved, but imaging time is significantly prolonged
Solution Approach 1:
The system segments the k-space data into regions affected by body movement and regions that remain unaffected. Only the affected segments are subjected to re-measurement, while unaffected segments are retained from the original acquisition. This segmentation strategy ensures image accuracy in critical regions while dramatically reducing the time required compared to complete re-measurement
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
The proposed method effectively suppresses artifacts in re-captured images and minimizes the extension of imaging time by stabilizing the longitudinal magnetization state, ensuring high-quality diagnostic images without significant time delays.
Implementation Method 1
an imaging unit 10 that collects nuclear magnetic resonance signals of a subject
Implementation Method 2
the imaging controller 210 controls the imaging unit 10 to execute a dummy scan of performing one or more times of RF pulse irradiation to generate dummy signals that are not used for image reconstruction
Data Source
AI summary
The present invention aims to reduce artifacts that occur in a re-captured image after imaging is interrupted due to a body movement, and to suppress extension in imaging time due to re-measurement as much as possible, thereby suppressing prolongation of the imaging time.In a case where re-measurement is performed after the body movement occurs, an artifact-suppression dummy scan including a plurality of dummy RF irradiation pulses is inserted. In this case, a period of the dummy scan is optimized to reduce the re-measurement time including the dummy scan. This makes it possible to quickly restore a steady state that has been disrupted by the body movement while preventing extension in imaging time, thereby suppressing the occurrence of the artifacts.