Esophageal pH and EGG recording and analyzing system

• Main Authors: Huan-Chuang Chih, 池桓壯
• Other Authors: 翁昭旼
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/25677144863718420135

碩士 === 國立臺灣大學 === 醫學工程學研究所 === 93 === A 24 hours ambulatory esophageal pH and electrogatrogram (EGG) recording system has been set up in this project. The unique feature of our system is that it can record the esophageal pH and EGG signals simultaneously. Current commercial available devices only measure the esophageal pH or EGG signals separately and no ambulatory EGG recording system is available now. We planned to improve our previous system to let it be more mobile for patients without disturbing their daily activity. A small thin memory card (SD card) is applied for data recording instead of the storage by PDA. Except size reducing, power saving is another benefit using the memory card. With this new ambulatory recording system, the examination will be more comfortable and more patients can be persuaded to receive the 24 hours recording of pH and EGG. Some bad situations such as disconnection of cable to PDA during examination can be avoided. Therefore, more complete and comprehensive information can be approached for further analysis. The measured EGG signals may include a lot of other undesired signals, such as respiration. We use independent component analysis (ICA) to separate the mixed EGG signals in this study. The gastric slow waves can be extracted out by ICA, but the signals are still mixed with some noise. The EGG channels are increased from 2 to 3 to evaluate if the increased channel has any additional benefit for data analysis. The results show that ICA and the increase of EGG channels really help signals separation and let us see the gastric slow waves more clearly.