Title :
A one op-amp current source for electrical impedance tomography
Author :
Nowicki, D.J. ; Webster, J.G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
Abstract :
A voltage-controlled current source containing one operational amplifier and used to drive an electrical impedance tomograph is described. The source is optimized to work at 50 kHz and maintains constant current through the entire range of loads expected in electrical impedance tomography. Because these loads may be grounded, the source can be used in parallel current injection systems. Because the source uses only one amplifier and does not require a driven shield, parts count is minimized. Because it can drive complex loads, a capacitor can be placed in its output path to prevent DC currents from flowing through the patient
Keywords :
bioelectric phenomena; biomedical electronics; computerised tomography; power supplies to apparatus; 50 kHz; DC current prevention; capacitor; complex loads; electrical impedance tomograph; electrical impedance tomography; medical diagnostic imaging; medical electronics; operational amplifier; parallel current injection systems; voltage-controlled current source; Capacitors; Circuit testing; Coaxial cables; Conductors; Crosstalk; Electrodes; Impedance; Operational amplifiers; Tomography; Voltage;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95817
