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Electrical bioimped...
Electrical bioimpedance spectroscopy in time-variant systems : Is undersampling always a problem?
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- Abtahi, Farhad (author)
- KTH,Medicinska sensorer, signaler och system
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- Seoane, Fernando (author)
- Högskolan i Borås,KTH,Medicinska sensorer, signaler och system,Institutionen Ingenjörshögskolan,Medical TexTTronics
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- Lindecrantz, Kaj (author)
- Högskolan i Borås,KTH,Medicinska sensorer, signaler och system,Institutionen Ingenjörshögskolan,Medical TexTTronics
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(creator_code:org_t)
- 2014-04-18
- 2014
- English.
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In: Journal of Electrical Bioimpedance. - : Walter de Gruyter GmbH. - 1891-5469. ; 5:1, s. 28-33
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Abstract
Subject headings
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- During the last decades, Electrical Bioimpedance Spectroscopy (EBIS) has been applied mainly by using the frequency-sweep technique, across a range of many different applications. Traditionally, the tissue under study is considered to be time-invariant and dynamic changes of tissue activity are ignored by treating the changes as a noise source. A new trend in EBIS is simultaneous electrical stimulation with several frequencies, through the application of a multi-sine, rectangular or other waveform. This method can provide measurements fast enough to sample dynamic changes of different tissues, such as cardiac muscle. This high sampling rate comes at a price of reduction in SNR and the increase in complexity of devices. Although the frequency-sweep technique is often inadequate for monitoring the dynamic changes in a variant system, it can be used successfully in applications focused on the time-invariant or slowly-variant part of a system. However, in order to successfully use frequency-sweep EBIS for monitoring time-variant systems, it is paramount to consider the effects of aliasing and especially the folding of higher frequencies, on the desired frequency e.g. DC level. This paper discusses sub-Nyquist sampling of thoracic EBIS measurements and its application in the case of monitoring pulmonary oedema. It is concluded that by considering aliasing, and with proper implementation of smoothing filters, as well as by using random sampling, frequency-sweep EBIS can be used for assessing time-invariant or slowly-variant properties of time-variant biological systems, even in the presence of aliasing. In general, undersampling is not always a problem, but does always require proper consideration.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk apparatteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Equipment Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinsk bioteknologi -- Biomedicinsk laboratorievetenskap/teknologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Medical Biotechnology -- Biomedical Laboratory Science/Technology (hsv//eng)
Keyword
- Electrical bioimpedance spectroscopy
- Aliasing in thoracic impedance spectroscopy
- frequency-sweep EBIS
- Thoracic Impedance Measurements
- sub-Nyquist sampling
- Medical Technology
- Medicinsk teknologi
- Electrical Engineering
- Elektro- och systemteknik
- Integrated Caring Science
Publication and Content Type
- ref (subject category)
- art (subject category)
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