MRI Acoustic Control Unit for Respiratory Motion Artifact Reduction
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Solution Overview
Problem
Magnetic Resonance Imaging (MRI) techniques face challenges in suppressing the influence of respiratory body motion, leading to image degradation and artifacts, especially in abdominal imaging, due to limited imaging time and variable breathing patterns, which restricts resolution and signal-to-noise ratio (SNR).
Innovation Solution
The implementation of an MRI apparatus and method that uses an acoustic control unit to apply a gradient magnetic field in synchronization with respiratory motion, acquiring correction data to generate image data that minimizes the impact of respiratory body motion, allowing for improved image stability and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If imaging time is extended to improve resolution and SNR, then image quality improves, but respiratory motion artifacts increase
Solution Approach 1:
The system performs preliminary actions by acquiring correction data at multiple predetermined time points before completing the full imaging sequence. This correction data is used to compensate for respiratory motion during the extended imaging process, allowing the system to maintain high resolution and SNR without excessive motion artifacts.
Solution Approach 2:
The system implements feedback by using acquired correction data to adjust and correct image data during the imaging process. The correction data obtained at different time points is applied to compensate for respiratory motion, creating a closed-loop system that continuously refines image quality despite ongoing respiratory movements.
2Object-affected harmful factors
If conventional breathing compensation is applied, then some motion artifacts are reduced, but image quality varies significantly with heart rate stability
Solution Approach 1:
The system acquires correction data at multiple predetermined time points before completing imaging, creating a more robust motion compensation strategy that does not depend on real-time heart rate stability. This preliminary acquisition of correction data at structured intervals provides consistent reference points for motion correction regardless of physiological variations.
Solution Approach 2:
The system changes the approach from relying on physiological parameters (heart rate stability) to using time-based sampling at predetermined intervals. By acquiring correction data at fixed time points rather than relying on physiological rhythm, the system achieves more consistent and reliable motion compensation.
3Object-affected harmful factors
If breath-holding imaging is used, then respiratory motion is minimized, but imaging time is limited to 10-30 seconds
Solution Approach 1:
The system performs preliminary acquisition of correction data at multiple predetermined time points during the imaging sequence. This allows the imaging process to extend beyond the 10-30 second breath-hold limit while maintaining motion compensation through the previously acquired correction data.
Solution Approach 2:
The imaging process is segmented into multiple phases: acquiring correction data at predetermined time points, then using that correction data for subsequent imaging. This segmentation allows the total imaging time to exceed breath-hold limitations while maintaining motion compensation benefits.
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
This approach effectively reduces respiratory motion artifacts, enabling higher resolution and SNR in MRI images by stabilizing breathing patterns and correcting for motion-related disturbances, thus enhancing diagnostic imaging capabilities.
Implementation Method 1
an acoustic control unit configured to apply a gradient magnetic field for controlling a sound in synchronization with a signal representing a respiratory body motion
Implementation Method 2
Magnetic Resonance Imaging is an imaging method which magnetically excites nuclear spins of an object set in a static magnetic field with an RF signal having the Larmor frequency and reconstructs an image based on an NMR signal generated due to the excitation
Data Source
AI summary
A magnetic resonance imaging apparatus includes an acoustic control unit and an image data acquisition unit. The acoustic control unit applies a gradient magnetic field for controlling a sound in synchronization with a signal representing a respiratory body motion. The image data acquisition unit acquires imaging data by subsequently imaging to control the sound and generate image data based on the imaging data.