Journal
PHYSIOLOGICAL MEASUREMENT
Volume 24, Issue 2, Pages 509-516Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0967-3334/24/2/361
Keywords
electrical impedance imaging; electrical impedance tomography; current source; generalized impedance converter
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Questions regarding the feasibility of using electrical impedance tomography (EIT) to detect breast cancer may be answered by building a sufficiently precise multiple frequency EIT instrument. Current sources are desirable for this application, yet no current source designs have been reported that have the required precision at the multiple frequencies needed. We have designed an EIT current source using an enhanced Howland topology in parallel with a generalized impedance converter (GIC). This combination allows for nearly independent adjustment of output resistance and output capacitance, resulting in simulated output impedances in excess of 2 GOmega between 100 Hz and I MHz. In this paper, the theoretical operation of this current source is explained, and experimental results demonstrate the feasibility of creating a high precision, multiple frequency, capacitance compensated current source for EIT applications.
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