MRI Halbach Magnet Array for Moving Joint Imaging
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Solution Overview
Problem
Current MRI technologies face limitations in processing time and image resolution when generating real-time images of moving joints, particularly due to the need for extensive computing power and limitations in data reconstruction techniques.
Innovation Solution
The implementation of a method and apparatus that utilize a Halbach magnet array and a portable probe assembly within an MRI device, allowing for real-time imaging of joints during movement by transmitting NMR signals and generating images using a computer system, with the option to use a treadmill or movable platform to position the joint within the imaging area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional MRI data reconstruction techniques are used, then image quality is maintained, but processing time is excessively long (minutes to hours)
Solution Approach 1:
The patent segments the MRI data acquisition into multiple undersampled views that are processed independently through iterative reconstruction, allowing parallel computation and significantly reducing total processing time while maintaining image quality
Solution Approach 2:
The patent performs preliminary undersampling of k-space data according to a predefined pattern before reconstruction, and uses iterative algorithms to recover high-quality images from this pre-processed data, eliminating the need for time-consuming full sampling
2Productivity
If real-time MRI imaging is implemented, then temporal resolution is improved, but computing power requirements become prohibitively high
Solution Approach 1:
The patent acquires only a partial set of k-space data (undersampling) rather than complete data, using iterative reconstruction to recover the missing information. This reduces the computational burden per frame while maintaining temporal resolution through efficient algorithmic processing
Solution Approach 2:
The patent uses iterative reconstruction algorithms that create progressive approximations of the final image from undersampled data, effectively copying and refining image estimates until convergence, thereby reducing the computational load compared to processing full data sets
3Loss of time
If data undersampling is applied to speed up acquisition, then scanning time is reduced, but image quality deteriorates due to artifacts
Solution Approach 1:
The patent implements iterative reconstruction where each iteration uses feedback from the previous reconstruction to refine the image, progressively reducing artifacts caused by undersampling and converging to a high-quality final image that accurately represents the original object
Solution Approach 2:
The patent changes the reconstruction parameters dynamically during iterative processing, adjusting regularization strength and convergence criteria to optimize the balance between artifact suppression and image detail preservation, thereby maintaining image quality despite undersampling
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 faster image processing and higher resolution images of moving joints, reducing the time required to produce images from minutes to seconds, while maintaining high signal quality and allowing for continuous data acquisition.
Implementation Method 1
The MRI device has an overall magnetic structure with portions on each side of a central region
Implementation Method 2
The implementation of a method and apparatus that utilize a Halbach magnet array and a portable probe assembly within an MRI device
Implementation Method 3
causing a nuclear magnetic resonance (NMR) signal to be formed within the central region; receiving the NMR signal within a probe assembly within the central region
Data Source
AI summary
A joint of a patient is scanned using MRI apparatus, and images of the joint area are produced as a body part of the patient is moved into a particular position known to cause a problem in the joint. The patient may walk or run on a treadmill during the process, or the body part may be supported on a surface causing or allowing such movement.