MRI Imaging Condition Reset for Phase-Encoding Aliasing
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Solution Overview
Problem
Existing MRI systems require manual user intervention to set imaging conditions, particularly to avoid aliasing in the phase encoding direction, which is inefficient and can lead to diagnostic issues if not properly executed.
Innovation Solution
An MRI apparatus with integrated units to automatically determine and adjust the field of view (FOV) and reception channel weights to prevent aliasing, based on initial settings and apparatus characteristics, reducing the need for manual re-setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual re-setting of FOV or reception channel is performed to avoid aliasing, then imaging quality is improved, but examination efficiency deteriorates
Solution Approach 1:
The MRI apparatus automatically detects aliasing in the image and performs re-setting of FOV or reception channel weighting without operator intervention. The system serves itself by autonomously identifying the presence of aliasing signals and executing the necessary parameter adjustments to eliminate them, thereby maintaining high imaging quality while preserving examination efficiency.
Solution Approach 2:
The system uses the acquired image as feedback to detect whether aliasing is present. Based on this feedback, the apparatus automatically adjusts imaging parameters (FOV or reception channel weights) and re-acquires the image, creating a closed-loop control system that ensures optimal imaging quality without manual intervention.
2Manufacturing precision
If FOV is expanded to prevent aliasing, then imaging quality is improved, but imaging time increases
Solution Approach 1:
Instead of always expanding the FOV to the maximum extent, the system performs only the necessary adjustment to eliminate aliasing. By detecting the actual presence and extent of aliasing signals, the apparatus applies the minimal required change to FOV or reception channel weights, avoiding unnecessary extension of imaging time while still achieving aliasing-free images.
3Manufacturing precision
If manual operation is required to prevent aliasing, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The MRI apparatus autonomously performs the entire aliasing prevention process: detecting aliasing in the acquired image, determining the appropriate correction method (FOV expansion or reception channel weight adjustment), executing the parameter change, and re-acquiring the image. This self-service capability eliminates the need for operator training and intervention, simplifying the operational interface while maintaining high imaging quality.
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 automation improves MRI examination efficiency by eliminating the complexity of manual adjustments and ensuring accurate imaging conditions without aliasing.
Implementation Method 1
an examination part is disposed in a uniform static magnetic field region
Implementation Method 2
a transmission coil that applies a high-frequency magnetic field to a subject placed in the static magnetic field
Implementation Method 3
a reception coil that has a plurality of elements and receives a nuclear magnetic resonance signal generated from the subject
Implementation Method 4
a gradient magnetic field coil for adding spatial information to the nuclear magnetic resonance signal
Data Source
AI summary
Provided is an MRI apparatus that supports re-setting of an imaging condition for preventing occurrence of aliasing in a phase encoding direction. A region in which an aliasing signal causing aliasing occurs is estimated by using a FOV set at the beginning and a positioning image, a range of the FOV to be changed or a weighting amount of each channel of a reception coil is calculated based on an estimation result, and an imaging condition is changed. Thereafter, a main scan is executed, and in a case where a weight of the reception coil is changed, channel combination is performed using the changed weight.