A multiobjective optimization procedure for the electrode design of cochlear implants
A multiobjective optimization procedure for the electrode design of cochlear implants
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DOI：
10.1002/cnm.2992
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发表时间：
2018-08-01
影响因子：
2.1
通讯作者：
Ramos-Macias, Angel
中科院分区：
文献类型：
--
作者：
Ramos-de-Miguel, Angel;Escobar, Jose M.;Ramos-Macias, Angel
本文提出了一种新的人工耳蜗电极优化设计方法。本研究的主要目的是寻找一套既能最大化聚焦又能使功耗最小的电极设计。为了达到这一目的，提出了一种衡量电极聚焦能力的标准。给出了(1)通过有限元方法求解拉普拉斯方程来确定电极感应电势的方法；(2)利用神经元的分区细胞模型来确定神经元对外加电场的响应；(3)基于非支配排序遗传算法II的两种进化多目标方法：直接多目标方法和种子多目标方法，根据功耗和聚焦来优化寻找最优的电极设计。提出了一种由两个可能存在电势差的导电环组成的电极设计。分析认为，神经元的响应取决于电极环的形状和电极环之间的电势差。我们的程序成功地实现了一组非支配的优化电极设计，在这两个目标上改进了标准电极，因为具有更好聚焦的设计允许在人工耳蜗中包括额外的电极，并且具有较低功耗的设计延长了电池的长度。
This paper presents a new procedure to design optimal electrodes for cochlear implants. The main objective of this study is to find a set of electrode designs that maximize the focalization and minimize the power consumption simultaneously. To achieve that, a criterion to measure the ability of focalization of an electrode is proposed. It is presented a procedure to determine (1) the electrical potential induced by an electrode by solving the Laplace equation through the finite element method; (2) the response of a neuron to an applied field using NEURON, a compartmentalized cell model; (3) the optimization to find the best electrode designs according to power consumption and focalization by 2 evolutionary multiobjective methods based on the non-dominated sorting genetic algorithm II: a straight multiobjective approach and a seeded multiobjective approach. An electrode design formed by 2 conductive rings with a possible difference of potential between them is proposed. It is analyzed that the response of the neuron is determined by the shape and the difference of the potential between the electrode rings. Our procedure successfully achieves a nondominated set of optimum electrode designs improving a standard electrode in both objectives, as designs with better focalization allow to include extra electrodes in the cochlear implant, and designs with lower power consumption extend the length of the battery.