Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Tsinghua University(Science and Technology)》 2010-09
Add to Favorite Get Latest Update

Electric field imaging of monopolar,bipolar and tripolar modes of electric stimuli in cochlear implant users

ZHU Ziyan1,2,3,TANG Qing3,ZENG Fangang3,GUAN Tian2,YE Datian2(1.Department of Biomedical Engineering,Tsinghua University,Beijing 100084,China;2.Graduate Schools at Shenzhen,Tsinghua University,Shenzhen 518055,China;3.Hearing and Speech Laboratory,University of California,Irvine CA 92697,USA)  
The spatial resolution of cochlear implants was investigated by measuring the electric field imaging(EFI) for seven cochlear implant users with three different stimulation modes.The result show that EFI(μV) exponentially decays from the stimulation position from both the apical and basal sides.The EFI parameters are significantly correlated between the apical and basal sides(p0.01).Moreover,the EFI parameters are significantly affected by the stimulation modes(p0.01) but independent of the amplitude level of the electrical stimuli artifacts.The EFI patterns are much narrower with bi-and tri-polar modes than with monopolar mode,suggesting that the restricted modes have higher spatial selectivity than the monopolar mode.However,the EFI patterns are asymmetric with the bipolar mode and require considerably large currents with the bi-and tri-polar modes.The perception ability of restricted stimuli need further study due to individual differences.
【Key Words】: cochlear implant stimulation mode electric field imaging(EFI) spatial resolution
【Fund】: 国家自然科学基金资助项目(30800234 60871083);; 国家留学基金高水平研究生项目;; 美国国家卫生研究所基金资助项目(1RO1DC008858 1P30DC008369)
【CateGory Index】: R764
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved