Publication: Scalp voltage response to conductivity changes in the brain in the application of electrical impedance tomography (EIT)
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Issued Date
2019
Resource Type
File Type
application/pdf
Other identifier(s)
2-s2.0-85062208153
Rights Holder(s)
Scopus
Bibliographic Citation
ECTI-CON 2018 - 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology. (2019), p.233-236
Suggested Citation
Suksawang S., Niamsri K., Ouypornkochagorn T. Scalp voltage response to conductivity changes in the brain in the application of electrical impedance tomography (EIT). ECTI-CON 2018 - 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology. (2019), p.233-236. doi:10.1109/ECTICon.2018.8620023 Retrieved from: https://hdl.handle.net/20.500.14740/5496
Author(s)
Abstract
EIT is a technique to image conductivity distribution which can be used to localize the response region in the brain to stimulation. The response could be originated from neurological activities or the change of cerebral blood volume. The scalp voltage could be used to localize as well, but the voltage response may be too small depending on many factors i.e. the frequency of excitation current, the volume of activated regions, which is hardly detected by an EIT machine. In this study, we investigated based on simulation on two realistic head models generated by MR images. An inclusion was generated in the brain region as a representative of blood. The result shows that the increase of conductivity due to the inclusion caused the decrease of voltage the scalp. The larger volume of the inclusion also led to the decrease of the voltage. When the frequency of the excitation current increased, the voltage response became lesser in amplitude, in particular at the 50 kHz. The minimum of voltage response was -3.19 µV or -0.016% at 50 Hz, and the maximum of the voltage response was -83.87µV or -0.35% at 50 kHz. This indicates that even though the scalp voltage can be used to localize the source of response, it is still challenging for designing an EIT machine to be able to detect the very small response voltage. © 2018 IEEE
Subject(s)
Blood
Brain
Electric impedance measurement
Electric impedance tomography
Magnetic resonance imaging
Cerebral blood volume
Conductivity changes
Conductivity distributions
Electrical impe dance tomography (EIT)
Excitation currents
Excitation frequency
Realistic head models
Voltage response
Electric impedance
Brain
Electric impedance measurement
Electric impedance tomography
Magnetic resonance imaging
Cerebral blood volume
Conductivity changes
Conductivity distributions
Electrical impe dance tomography (EIT)
Excitation currents
Excitation frequency
Realistic head models
Voltage response
Electric impedance