MRI Distortion Correction via Adaptive Calculation
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Solution Overview
Problem
Magnetic resonance imaging (MRI) apparatuses face challenges in accurately correcting for distortions caused by inhomogeneities in the static magnetic field and nonlinearity of the gradient magnetic field, which can lead to inaccuracies in image reconstruction and positioning.
Innovation Solution
The MRI apparatus employs processing circuitry to generate a distortion-corrected image by applying an inverse correction method based on imaging conditions, using a correspondence table to determine coefficients for imaging cross-section correction, and calculates a second area on a distortion non-corrected image to optimize imaging cross-section correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MRI apparatus performs imaging cross-section correction using a distortion corrected image, then image positioning accuracy is improved, but calculation amount increases
Solution Approach 1:
The patent applies parameter changes by selecting different imaging cross-section correction methods based on imaging conditions. When the imaging region is the entire cross-section, a first correction method is used, but when the imaging region is a partial area, a second correction method with less calculation is applied. This dynamic parameter adjustment resolves the contradiction between positioning accuracy and calculation amount.
2Ease of operation
If the MRI apparatus applies the same imaging cross-section correction method regardless of imaging condition, then operational simplicity is improved, but calculation efficiency deteriorates
Solution Approach 1:
The patent implements dynamics by making the imaging cross-section correction method adaptive to different imaging conditions. The system automatically determines whether to apply the first or second correction method based on the imaging region parameters, achieving both operational simplicity through automation and calculation efficiency through condition-based optimization.
3Manufacturing precision
If the MRI apparatus uses a distortion corrected image for positioning, then image accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by using only the necessary portion of the distortion corrected image for positioning purposes. When the imaging region is limited to a partial area, the system applies correction only to the relevant region rather than processing the entire cross-section, thereby maintaining image accuracy while reducing processing time.
Data Source
AI summary
According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates, from a first image influenced by a magnetic field distortion, a second image in which the influence of the distortion is corrected, receives a first area setting in the second image and calculates, by a method of the calculation depending on an imaging purpose, an excitation area in the imaging based on the first area.