Comput Math Methods Med - Influence of different geometric representations of the volume conductor on nerve activation during electrical stimulation.


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Volume conductor models with different geometric representations, such as the parallel layer model (PM), the cylindrical layer model (CM), or the anatomically based model (AM), have been employed during the implementation of bioelectrical models for electrical stimulation (FES). Evaluating their strengths and limitations to predict nerve activation is fundamental to achieve a good trade-off between accuracy and computation time. However, there are no studies aimed at clarifying the following questions. (1) Does the nerve activation differ between CM and PM? (2) How well do CM and PM approximate an AM? (3) What is the effect of the presence of blood vessels and nerve trunk on nerve activation prediction? Therefore, in this study, we addressed these questions by comparing nerve activation between CM, PM, and AM models by FES. The activation threshold was used to evaluate the models under different configurations of superficial electrodes (size and distance), nerve depths, and stimulation sites. Additionally, the influences of the sciatic nerve, femoral artery, and femoral vein were inspected for a human thigh. The results showed that the CM and PM had a high error rate, but the variation of the activation threshold followed the same tendency for electrode size and interelectrode distance variation as AM.

Resumo Limpo

volum conductor model differ geometr represent parallel layer model pm cylindr layer model cm anatom base model employ implement bioelectr model electr stimul fes evalu strength limit predict nerv activ fundament achiev good tradeoff accuraci comput time howev studi aim clarifi follow question nerv activ differ cm pm well cm pm approxim effect presenc blood vessel nerv trunk nerv activ predict therefor studi address question compar nerv activ cm pm model fes activ threshold use evalu model differ configur superfici electrod size distanc nerv depth stimul site addit influenc sciatic nerv femor arteri femor vein inspect human thigh result show cm pm high error rate variat activ threshold follow tendenc electrod size interelectrod distanc variat

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