Virtual channel discrimination is improved by current focusing in cochlear implant recipients.
Virtual channel discrimination is improved by current focusing in cochlear implant recipients.
复制标题
DOI：
10.1016/j.heares.2009.04.007
复制
发表时间：
2009-08
期刊：
影响因子：
2.8
通讯作者：
Srinivasan, Arthi G.
中科院分区：
文献类型：
--
作者：
Landsberger, David M.;Srinivasan, Arthi G.
植入电极的数量和电极之间的通道相互作用限制了植入电极使用者的光谱分辨率。两个相邻单极电极之间的电流引导（虚拟通道）已被用于增加电极阵列上的光谱通道的数量。然而，单极刺激与大电流扩散和增加的通道相互作用相关。跨三个相邻电极的电流聚焦（三极刺激）已用于减少电极电流扩散并提高通道选择性。在本研究中，将电流导向和电流聚焦结合在四电极刺激模式（四极虚拟通道）中，从而解决了增加通道和减少电流扩散的需求。在Advanced Bionics Clarion II或HiRes 90 K植入体的7名用户中测量了虚拟通道辨别力;在三个刺激部位比较了单极和四极虚拟通道之间的虚拟通道辨别力。结果表明，四极虚拟通道比单极虚拟通道提供更好的光谱分辨率。结果表明，四极虚拟通道可能提供“两全其美”，提高光谱通道的数量，同时减少通道相互作用。
Cochlear implant users' spectral resolution is limited by both the number of implanted electrodes and channel interactions between electrodes. Current steering (virtual channels) between two adjacent monopolar electrodes has been used to increase the number of spectral channels across the electrode array. However, monopolar stimulation is associated with large current spread and increased channel interaction. Current focusing across three adjacent electrodes (tripolar stimulation) has been used to reduce electrode current spread and improve channel selectivity. In the present study, current steering and current focusing were combined within a four-electrode stimulation pattern (quadrupolar virtual channels), thereby addressing the need for both increased channels and reduced current spread. Virtual channel discrimination was measured in 7 users of the Advanced Bionics Clarion II or HiRes 90K implants; virtual channel discrimination was compared between monopolar and quadrupolar virtual channels at three stimulation sites. The results showed that quadrupolar virtual channels provided better spectral resolution than monopolar virtual channels. The results suggested that quadrupolar virtual channels might provide the “best of both worlds” improving the number of spectral channels while reducing channel interactions.
登录
查看更多内容
影响因子：
2.4
作者：
Loizou, PC;Dorman, M;Tu, ZM
通讯作者：
Tu, ZM
影响因子：
2.4
作者：
Fu, QJ;Shannon, RV;Wang, XS
通讯作者：
Wang, XS
影响因子：
2.8
作者：
Briaire, JJ;Frijns, JHM
通讯作者：
Frijns, JHM
影响因子：
2.4
作者：
Henry, BA;Turner, CW
通讯作者：
Turner, CW
影响因子：
3.7
作者：
Busby, Peter A.;Battmer, Rolf D.;Pesch, Joerg
通讯作者：
Pesch, Joerg