Design of multifocal visual electrophysiology examining system based on fast m-transform.
- Author:
Sijie ZHANG
1
;
Xingming GUO
;
Chenglin PENG
;
Li SHENG
Author Information
1. College of Bioengineering, Chongqing University, Chongqing, China. zhangsj1967@hotmail.com
- Publication Type:Journal Article
- MeSH:
Electrophysiology;
Electroretinography;
methods;
Humans;
Image Processing, Computer-Assisted;
Signal Processing, Computer-Assisted;
Systems Analysis;
Visual Perception;
physiology
- From:
Journal of Biomedical Engineering
2005;22(4):829-832
- CountryChina
- Language:Chinese
-
Abstract:
The multifocal visual electrophysiology is an objective and non-invasive method to examine visual function. It can examine many tiny areas of retina at the same time and have a particular advantage in diagnosing the early diseases of ocular fundus. This paper introduces the design of multifocal visual electrophysiology examining system. The system uses multidisplay technology exclusively owned by Windows 98 or above operating system to control graphics stimulator which generates specified hexagonal array. The white or black transition of each hexagon controlled by a binary m-sequence stimulates corresponding area of retina. The specified Burian-Allen electrode is used to extract the mixed signal originated from many areas of retina. The signal is amplified and A/D transformed. The computer separates the mixed signal through fast m-transform and gets the response of each area of retina. The fast m-transform is a fast computation of cross-correlations with binary m-sequences and can reduce cross-correlation computation to a single Fast Walsh Transform. So a lot of time can be saved.
