fMRI-Compatible Touch Tablet for Non-Magnetic User Input
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Solution Overview
Problem
Current technologies lack a device capable of capturing and visualizing drawing and writing movements during functional magnetic resonance imaging (fMRI), which is essential for neuropsychological assessments and understanding brain activity associated with everyday tasks, due to constraints such as strong magnetic fields and sensitivity to electromagnetic interference.
Innovation Solution
An fMRI-compatible touch-sensitive tablet system with a touch-sensitive surface, a support for ergonomic access, and a microprocessor controller for converting user input into visual stimuli and logging temporal and spatial coordinates, allowing users to interact naturally within the MRI scanner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional touch screen or tablet is used for user input during fMRI, then ease of operation is improved, but electromagnetic interference with the MRI scanner increases
Solution Approach 1:
The patent introduces an intermediary optical system consisting of a transparent touch-sensitive overlay and optical fibers that transmit user input data out of the magnetically shielded enclosure. This mediator allows electronic interaction without direct electronic connections inside the MRI scanner, eliminating electromagnetic interference while preserving ease of operation.
Solution Approach 2:
The patent replaces traditional electronic touch screen controllers with an optical detection system. The touch-sensitive overlay detects mechanical pressure and position, then transmits this information optically through fibers to an external processor, substituting electronic signal transmission with optical transmission to avoid electromagnetic interference.
2Ease of operation
If electronic equipment is placed inside the MRI scanner for real-time interaction, then ease of operation is improved, but the strong magnetic field causes interference and safety issues
Solution Approach 1:
The patent extracts all electronic processing equipment from the MRI scanner's magnetically shielded environment. The touch-sensitive overlay remains inside for user interaction, but the microprocessor controller and data processing systems are located outside the scanner room, connected only through optically isolated channels, thereby eliminating magnetic field interference with electronic components.
Solution Approach 2:
Optical fibers serve as an intermediary medium that allows real-time data transmission between the touch interface inside the scanner and the processing equipment outside. This mediator enables real-time interaction without exposing electronic components to the strong magnetic field.
3Ease of operation
If a complex articulating touchscreen system is used to provide ergonomic access, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent uses a flexible transparent touch-sensitive overlay film that can be mounted directly on existing display surfaces within the scanner bore. This thin-film approach provides ergonomic touch interaction without requiring complex articulating mechanisms or rigid structural components, thereby reducing device complexity while maintaining ease of operation.
Data Source
AI summary
The present invention provides a method and device to record and visualize drawing and writing movements during functional magnetic resonance imaging (fMRI) of brain activity. The system includes a touch-sensitive tablet, an elevated mounting platform, a stylus, and a controller box, as well as the necessary cabling and software. All equipment residing inside the magnet room is non-ferromagnetic and does not interfere with scanner operation and does not affect fMRI data quality. Individuals lying inside the scanner interact with device in a natural, intuitive way, similar to writing with pen and paper. Drawing motions captured by the tablet are displayed through a pair of fMRI-compatible goggles or by using a projector and screen. Other visual stimuli can be concurrently presented with the drawing motions for the purpose of assessing specific aspects of human behavior. The system allows for a plurality of experiments to be performed, all while brain activity is measured and recorded.