MRI Radial Sampling Gradient Correction for Noise Reduction
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Solution Overview
Problem
The multi-slice MRI imaging technique faces challenges in generating high-quality images due to defects and noise caused by overlapping magnetic resonance signals, especially when applying radial sampling to moving objects, which results in radial distortion and requires effective gradient control to manage the read-out gradient changes.
Innovation Solution
An MRI apparatus and method that includes a gradient control unit for applying spatial encoding and corrected gradients to slices, an RF reception unit for receiving radially sampled signals, and an image processing unit for generating images, which separates and processes signals to reduce noise and enhance image quality by adjusting the gradient based on the angle and offset of each slice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-slice imaging technique is applied to acquire MR signals of multiple slices within one TR interval, then imaging speed and productivity are improved, but defects and noise are generated due to overlapping MR signals
Solution Approach 1:
The patent segments the imaging process by applying different spatial encoding gradients to different slices, allowing simultaneous acquisition of multiple slices while maintaining signal separation through gradient differentiation
Solution Approach 2:
The patent changes the gradient parameters (spatial encoding gradients) for each slice to enable signal separation during reconstruction, thereby reducing noise and artifacts while maintaining high imaging speed
2Area of stationary object
If radial sampling is applied to generate MRI images of moving objects, then field of view is expanded and imaging flexibility is improved, but radial distortion occurs requiring corrected gradient application
Solution Approach 1:
The patent applies dynamic corrected gradients that vary with the read-out gradient magnitude to compensate for radial distortion, allowing flexible FOV adjustment while maintaining image geometric accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the corrected gradient is calculated based on the read-out gradient magnitude, automatically compensating for distortion effects across different imaging conditions
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 enables the generation of MRI images with improved signal-to-noise ratio and a wider field of view, effectively addressing the issues of radial distortion and noise, while shortening scan time and enhancing image quality.
Implementation Method 1
acquiring MR (magnetic resonance) signals of a plurality of slices of an object within one TR (repetition time) interval
Implementation Method 2
apply a spatial encoding gradient to at least two slices of a plurality of slices
Implementation Method 3
receiving a magnetic resonance signal of each of the at least two slices radially sampled as the corrected gradient is applied
Data Source
AI summary
The present disclosure in some embodiments provides a method and an apparatus for processing MRI images wherein a plurality of slices of an object is applied with a spatial encoding gradient and a corrected gradient for applying a radial sampling, and radially sampled magnetic resonance signals of the slices are received, and MRI images are generated with the radial sampling applied over multi-bands.