Anomaly Detection Using Electric Impedance Tomography Based on Real and Imaginary Images

• Published in: Sensors (Basel, Switzerland) Vol. 20; no. 7; p. 1907
• Main Authors: Sapuan, Imam, Yasin, Moh, Ain, Khusnul, Apsari, Retna
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 30.03.2020; MDPI
• Subjects: Algorithms; Anomalies; Breast cancer; Current sources; Data acquisition systems; detection of anomaly; Electric currents; Electric Impedance; Electrical impedance; Electrical Impedance Tomography; Electrodes; Fourier transforms; Humans; Image analysis; Image contrast; Image detection; Image Processing, Computer-Assisted - methods; Organs; Phantoms, Imaging; Phase meters; Programmable current sources; Reactance; real and imaginary image; resistive and capacitive image; Sensors; Thorax - diagnostic imaging; Tomography; Tomography - methods; real and imaginary image; Electrical Impedance Tomography; resistive and capacitive image; detection of anomaly
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s20071907

This research offers a method for separating the components of tissue impedance, namely resistance and capacitive reactance. Two objects that have similar impedance or low contrast can be improved through separating the real and imaginary images. This method requires an Electrical Impedance Tomography (EIT) device. EIT can obtain potential data and the phase angle between the current and the potential measured. In the future, the device is very suitable for imaging organs in the thorax and abdomen that have the same impedance but different resistance and capacitive reactance. This device consists of programmable generators, Voltage Controlled Current Source (VCCS), mulptiplexer-demultiplexer potential meters, and phase meters. Data collecting was done by employing neighboring, while reconstruction was used the linear back-projection method from two different data frequencies, namely 10 kHz and 100 kHz. Phantom used in this experiment consists of distillated water and a carrot as an anomaly. Potential and phase data from the device is reconstructed to produce impedance, real, and imaginary images. Image analysis is performed by comparing the three images to the phantom. The experimental results show that the device is reliable.