| Summary: | 博士 === 國立成功大學 === 電機工程學系 === 89 === A Portable and Programmable EOG System with Stimulation and Measurement Functions for Clinical Diagnosis
ABSRACT
Monitoring eye movements is clinically important in diagnosis of diseases of the central nervous system. Electrooculography (EOG) is one method of obtaining such records that uses skin electrodes and utilizes the anterior posterior polarization of the eye. A new EOG diagnostic system has been developed that utilizes two off-the-shelf portable notebook computers, one projector and simple electronic hardware only. It can be operated under Windows 95, 98, NT, and has significant advantages over any other similar equipment, including programmability, portability, improved safety, and cheap cost. Especially, portability of the instrument is extremely important for acutely ill or handicapped patients. The purpose of this thesis is to introduce the techniques of computer animation, data acquisition, real time analysis of measured data, and database management to implement a portable, programmable and inexpensive contacting EOG instrument. It is very convenient to replace the present expensive, inflexible and large-sized commercial available EOG instruments. A lot of interesting stimulation patterns for clinical application can be created easily in different shape, time sequence, and color by programming in VB language. With the help of Winstar (a software package that is used to control I/O and interrupt functions of computer under Windows 95, 98, NT), the I/O communication between two notebook computers and A/D interface module can be effectively programmed. LabView graphic language is also very helpful to write programs for data acquisition and data analysis. There are two A/D devices that can be chosen as the user wants, one is the A/D interface module we developed and the other is an off-the-shelf A/D card called DAQcard-1200. Both of them are portable, compact and easily controlled. In addition, the new EOG diagnostic system is battery operated and it has the advantages of low noise as well as isolation from electricity. Three kinds of EOG tests, pursuit, saccade, and OKN were experimented on twenty normal subjects using this new portable and programmable instrument. Based on the test result, the performance of the new instrument is superior to the other commercial available instruments. In conclusion, we hope that it will be more convenient for doctors and researchers to do the clinical EOG diagnosis and basic medical science research by using this new creation.
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