Paper Info
Title
A Comparison of Techniques to Optimize Measurement of Voltage Changes in Electrical Impedance Tomography by Minimizing Phase Shift Errors.
Abstract
In electrical impedance tomography, errors due to stray capacitance may be reduced by optimization of the reference phase of the demodulator. Two possible methods, maximization of the demodulator output and minimization of reciprocity error have been assessed, applied to each electrode combination individually, or to all combinations as a whole. Using an EIT system with a single impedance measuring circuit and multiplexer to address the 16 electrodes, the methods were tested on resistor-capacitor networks, saline-filled tanks and humans during variation of the saline con- centration of a constant fluid volume in the stomach. Optimiza- tion of each channel individually gave less error, particularly on humans, and maximization of the output of the demodulator was more robust. This method is, therefore, recommended to optimize systems and reduce systematic errors with similar EIT systems. Index Terms—Demodulator, EIT, reciprocity error.
Year
DOI
Venue
2002
10.1109/TMI.2002.800577
IEEE Trans. Med. Imaging
Keywords
Field
DocType
impedance measurement,eit,systematic error,indexing terms,demodulation,measurement errors,minimisation,multiplexer,electrical impedance tomography,system,quality control,tomography,minimization,phase shift,demodulator,capacitance,electrodes
Demodulation,Mathematical optimization,Capacitance,Parasitic capacitance,Control theory,Multiplexer,Electrical impedance,Electrical capacitance tomography,Mathematics,Observational error,Electrical impedance tomography
Journal
Volume
Issue
ISSN
21
6
0278-0062
Citations 
PageRank 
References 
3
1.47
0
Authors
5
Name
Order
Citations
PageRank
A.J. Fitzgerald131.81
D S Holder25010.07
Leila Eadie383.03
C. Hare431.47
richard bayford592.64