Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/29326
ชื่อเรื่อง: High-Precision Electrical Impedance Tomography System Using Package Excitation
ผู้แต่ง: Ouypornkochagorn T.
Ngamdi N.
Keywords: Clementine electrical impedance tomography (EIT)
EIT system
multifrequency
package excitation
superposition excitation
วันที่เผยแพร่: 2023
สำนักพิมพ์: Institute of Electrical and Electronics Engineers Inc.
บทคัดย่อ: In this article, we present a high-precision multifrequency electrical impedance tomography (EIT) system for wide areas of medical applications. The system has 32 channels with full parallel data acquisition. Instead of using superposition excitation for producing an excitation current, we propose to use package excitation of five different frequencies between 2 and 125 kHz. The excitation period is divided into five subperiods, where only one frequency of excitation is performed at a subperiod. This excitation method can increase the readout signal-to-noise ratio (SNR) by 30 dB. The data of each frequency can be collected simultaneously. The amplitudes are programable with a maximum of 2.83 mArms. The recording speed is 20 frames/s (fps). A 18-bit analog-to-digital converters (ADCs) are used to obtain a fine resolution with a wide measurement range. The maximum load of the current source is 2000Ω. The SNR of the current source and the voltage measurement unit are 78.5 and 91.7 dB, respectively. However, the SNRs are reduced to 67.9 and 81 dB, respectively, at the 2 kHz and 0.2 mA rms of excitation. With high SNR and a wide measurement range, this system is then applicable for wide medical applications, where high precision is required. The system validation was performed on a phantom tank, a human forearm, and a human chest with satisfactory results. © 2023 IEEE.
URI: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85174826261&doi=10.1109%2fTIM.2023.3324360&partnerID=40&md5=3c646046af41630ea7b70040811ef153
https://ir.swu.ac.th/jspui/handle/123456789/29326
Appears in Collections:Scopus 2023

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