{"title":"Characterization of the implantable neurostimulator-based wireless bioimpedance measurement technique","authors":"D. Celinskis, B. Towe","doi":"10.1109/EMBSISC.2016.7508602","DOIUrl":"https://doi.org/10.1109/EMBSISC.2016.7508602","url":null,"abstract":"A system for wireless bioimpedance measurements in small localized volumes was investigated using a millimeter-sized implantable device powered by ultrasound energy. The minimally invasive implant is very simple, consisting of two passive components that receive and demodulate the ultrasound which then directly drives tissue currents. By varying the ultrasound drive level and its amplitude modulation frequencies, the implantable device, in addition to neurostimulation, can be used to perform impedance measurements, thus offering a potential to both therapeutically neurostimulate tissue as well as record tissue impedance changes resulting from the stimulation. The system communicates in the return path by volume conduction. Potentials detected by skin electrodes are used to construct tissue impedance plots. In this report we demonstrate the feasibility of wireless impedance measurements and characterize system performance in terms of the signal detectability over the distance.","PeriodicalId":361773,"journal":{"name":"2016 IEEE EMBS International Student Conference (ISC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132213286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of active and passive electrodes in their optimized electroencephalography amplifier system","authors":"Veronika Cencen, M. Hirotani, A. Chan","doi":"10.1109/EMBSISC.2016.7508603","DOIUrl":"https://doi.org/10.1109/EMBSISC.2016.7508603","url":null,"abstract":"Electroencephalography (EEG) is a common method of obtaining temporally distinguishable event-related potentials (ERP). The quality of the signal is dependent on several factors, including the selection of the amplifier system and electrode type. The aim of this study is to compare the performance of two electrode types, active and passive, with their respectively optimized amplifier system, in distinguishing an ERP signal. The QuickAmp system was used with passive electrodes, while the ActiCHamp was used with active electrodes. EEG data were recorded by the two amplifier systems in different experimental sessions. In each experimental session, the same participant listened to the same set of acoustically controlled English sentences. Data were obtained from the participant via a 32-channel Easycap (10-20 configuration), through the amplifier, to the BrainVision signal recording software. Based on the analysis using EEGlab, it appears that ActiCHamp reduced noise power, but also yielded lower signal power. The results are preliminary, being from a single participant, but suggest both electrode types can yield comparable signal-to-noise ratios.","PeriodicalId":361773,"journal":{"name":"2016 IEEE EMBS International Student Conference (ISC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132265735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}