Sensors | |
A Low-Cost, Computer-Interfaced Drawing Pad for fMRI Studies of Dysgraphia and Dyslexia | |
Frederick Reitz1  Todd Richards2  Kelvin Wu1  Peter Boord2  Mary Askren2  Thomas Lewis1  | |
[1] Instrument Development Lab, Center on Human Development and Disability, University of Washington, Seattle, WA 98195, USA; E-Mails:;Integrated Brain Imaging Center, Department of Radiology, University of Washington, Seattle, WA 98195, USA; E-Mails: | |
关键词: fMRI; MRI-compatible; dygraphia; dyslexia; lexical; handwriting; LabVIEW; | |
DOI : 10.3390/s130405099 | |
来源: mdpi | |
【 摘 要 】
We have developed a pen and writing tablet for use by subjects during fMRI scanning. The pen consists of two jacketed, multi-mode optical fibers routed to the tip of a hollowed-out ball-point pen. The pen has been further modified by addition of a plastic plate to maintain a perpendicular pen-tablet orientation. The tablet is simply a non-metallic frame holding a paper print of continuously varying color gradients. The optical fibers are routed out of the MRI bore to a light-tight box in an adjacent control room. Within the box, light from a high intensity LED is coupled into one of the fibers, while the other fiber abuts a color sensor. Light from the LED exits the pen tip, illuminating a small spot on the tablet, and the resulting reflected light is routed to the color sensor. Given a lookup table of position for each color on the tablet, the coordinates of the pen on the tablet may be displayed and digitized in real-time. While simple and inexpensive, the system achieves sufficient resolution to grade writing tasks testing dysgraphic and dyslexic phenomena.
【 授权许可】
CC BY
© 2013 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
Files | Size | Format | View |
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RO202003190036965ZK.pdf | 877KB | download |