Design and Implementation of Current Sources and Phantoms for Electrical Impedance Tomography
Edward Emanuel Alexander, Farkhad Ihsan Hariadi, Hasballah Zakaria
School of Electrical Engineering and Informatics, Institut Teknologi Bandung, Jln. Ganesha 10, Bandung 40132, Indonesia
Abstract
Abstract - Device Electrical Impedance Tomography (EIT) is an imagery tool that produces cross-sectional imagery of a distribution object based on its conductivity or resistivity. Conductivity can be obtained by using electric voltage distribution data. In order for the electric voltage distribution data to be obtained, a current source with a stable value and a frequency determined to flow through the electrode circuit. The current source used on this device will produce a current value of 1mA with a frequency of 50kHz. This series of current sources is designed by using the Digital to Analog Converter (DAC) feature of the microcontroller system as an input signal generator which is then converted into a current source in the Voltage Control Current Source (VCCS) circuit. The generated current will be injected into a series of electrodes composed of 32 metal plates arranged in a circle in a container. The metal used must have good conductivity so that it can flow the current well.
Keywords: EIT, DAC, VCCS, Microcontroller system, electrode circuit
Topic: Biomedical, Robotic and ICT engineering