MRI Blade Radial Sampling with Uneven Interline Intervals
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Solution Overview
Problem
The blade type radial measurement in MRI technology faces challenges in reducing artifacts and shortening imaging time, particularly when reducing the number of blades leads to gaps in high-frequency regions causing streak artifacts.
Innovation Solution
The MRI apparatus controls the sampling pattern by varying the angle of the blade with multiple parallel sampling lines and sets interline intervals to uneven intervals for at least one of the blades with different angles, optimizing the overall sampling density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the number of blades is reduced to accelerate imaging, then imaging time is shortened, but gaps occur in high-frequency regions causing streak artifacts
Solution Approach 1:
The patent applies local quality by making the interline intervals non-uniform across different regions of the k-space. Specifically, the intervals between adjacent sampling lines are made smaller in the central region (low-frequency) and larger in the peripheral region (high-frequency). This localized variation in sampling density optimizes image quality by ensuring adequate coverage in high-frequency regions while maintaining reasonable imaging speed.
Solution Approach 2:
The patent changes the sampling parameter (interline interval) from a constant value to a variable value that depends on the position in the k-space. By making the interline intervals non-uniform, the sampling pattern adapts to the different requirements of central and peripheral regions, resolving the contradiction between reduced sampling lines and artifact prevention.
2Productivity
If the number of sampling lines is reduced to accelerate imaging, then imaging time is shortened, but sampling density becomes insufficient causing artifacts
Solution Approach 1:
The patent implements local quality by differentiating the sampling density in different regions. The interline intervals are made non-uniform, with smaller intervals in the central region and larger intervals in the peripheral region. This allows the system to maintain adequate sampling density where needed while reducing the total number of sampling lines to improve imaging speed.
Solution Approach 2:
The patent introduces asymmetry in the sampling pattern by using non-uniform interline intervals instead of uniform spacing. This asymmetric sampling strategy optimizes the distribution of sampling lines to match the actual information requirements of different k-space regions, improving efficiency without sacrificing measurement precision.
3Device complexity
If uniform interline intervals are used in blade type radial measurement, then sampling pattern is simple, but gaps occur in high-frequency regions causing streak artifacts
Solution Approach 1:
The patent resolves this contradiction by applying local quality through non-uniform interline intervals. Instead of using a simple uniform sampling pattern that causes artifacts, the system adopts a more complex variable spacing pattern that adapts to local requirements, preventing streak artifacts while maintaining manageable system complexity.
Solution Approach 2:
The patent changes the sampling parameter from a constant uniform interval to a variable non-uniform interval that varies with position in the k-space. This parameter change transforms the sampling pattern from a simple but flawed uniform grid to a more complex but effective variable spacing pattern that eliminates artifacts.
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 mitigates the difference in sampling density between high-frequency and low-frequency regions, reducing streak artifacts even when the number of blades is reduced, thereby improving image quality and reducing artifacts.
Implementation Method 1
an imaging unit that collects k-space data by measuring a nuclear magnetic resonance signal generated by a subject in accordance with a predetermined pulse sequence
Data Source
AI summary
Image quality can be improved and acceleration can be achieved, by optimizing sampling in a blade type radial measurement using an MRI apparatus. In a case of performing a blade type radial measurement in which a k-space is radially sampled by varying an angle of a blade configured with a plurality of parallel sampling lines, interline intervals between the plurality of parallel sampling lines are set to uneven intervals for at least one of a plurality of the blades having different angles. The sampling using uneven intervals can be evaluated, and line intervals can also be adjusted based on an evaluation result.