A flexible low-cost, high-precision, single interface electrical impedance tomography system for breast cancer detection using FPGA

Abstract

(2010) A flexible low-cost, high-precision, single interface electrical impedance tomography system for breast cancer detection using FPGA. Journal of Physics: Conference Series, 224 (1). 012169. ISSN 1742-6588 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/40505/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Abstract. Typically, in multi-frequency Electrical Impedance Tomography (EIT) systems, a current is applied and the voltages developed across the subject are detected. However, due to the complexity of designing stable current sources, there has been mention in the literature of applying a voltage to the subject whilst measuring the consequent current flow. This paper presents a comparative study between the two techniques in a novel design suitable for the detection of breast cancers. The suggested instrument borrows the best features of both the injection of current and the application of voltage, circumventing their limitations. Furthermore, the system has a common patient-electrode interface for both methodologies, whilst the control of the system and the necessary signal processing is carried out in a field programmable gate array (FPGA). Through this novel system, wide-bandwidth, low-noise, as well as high-speed (frame rate) can be achieved.

The Research Progress of Electrical Impedance Tomography for Lung Monitoring

“…This method is relatively fixed, and it is easy to be limited by the fixed parameters when using. In addition, we can also use FPGA (field programmable gate array)/CPLD (complex programmable logic device) to replace the function of a phase accumulator module in DDS principle (Artem and Dmitry, 2013) and then convert the digital output into an analog signal through external DAC (digital to analog converter) (Zarafshani et al, 2010;Baidillah et al, 2019). A typical digital controller is composed of FPGA and a microcontroller.…”

Current source enhancements in Electrical Impedance Spectroscopy (EIS) to cancel unwanted capacitive effects

“…); programmable gain amplifier (PGA) and analogue-to-digital convertor (ADC) modules. In our system, a single compact EIS circuit board consists of all EIS modules denoted by the hardware block diagram with a planar 85-electrode plate is designed as shown in Figure 1(b) [12][13][14][15][16][17] . This custom EIS board is placed at the bottom of the saline tank and the breast is immersed in a saline solution.…”

Feasibility Test of Quantitative Assessment of Breast Density Based on Dielectric Impedance Spectroscopy

“…Among them, studies have reported that malignant breast tissues might have 20 to 40 fold higher conductivity and capacitance than the negative breast tissues [22] and the dielectric impedance level also varies with the varying frequencies of the applied electrical field and change of the electrical properties of the breast tissue [23]. Besides in vivo and in vitro studies based on resected human tissues, a number of non-invasive electrical impedance tomography (EIT) and spectroscopy (EIS) have been developed and investigated to detect suspicious breast lesions based on the electrical impedance maps [24][25][26][27][28]. In order to provide a more effective tool to more accurately and conveniently assess and quantify breast density, we propose a new technology based on the non-invasive measurement of dielectric impedance signal or spectrum of the breast.…”