TY - JOUR
T1 - Dependence of apparent resistance of four-electrode probes on insertion depth
AU - Tsai, Jang Zern
AU - Cao, Hong
AU - Tungjitkusolmun, Supan
AU - Woo, Eung Je
AU - Vorperian, Vicken R.
AU - Webster, John G.
N1 - Funding Information:
Manuscript received July 9, 1998; revised June 24, 1999. This work was supported by the National Institutes of Health (NIH) under Grant HL56143. Asterisk indicates corresponding author. J.-Z. Tsai, H. Cao, and S. Tungjitkusolmun, are with the Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706 USA. *J. G. Webster is with the Department of Biomedical Engineering, University of Wisconsin, 1415 Engineering Drive, Madison, WI 53706 USA (e-mail: [email protected]). E. J. Woo is with the School of Electronics and Information, Kyung Hee University, 1 Sochen-ni, Kihung-eop, Yongin, Kyongki-do, Korea 449-701. V. R. Vorperian is with the Department of Medicine, University of Wisconsin, Madison, WI 53792 USA. Publisher Item Identifier S 0018-9294(00)00249-4.
PY - 2000
Y1 - 2000
N2 - The apparent resistance of a finite-thickness layer measured with a four-electrode plunge probe depends on the electrode insertion depth, electrode spacing, and layer thickness, as well as the resistivity ratio of an underlying layer. A physical model consisting of air, a saline solution layer, and an agar layer simulates the real situation of resistivity measurement. The saline layer represents the finite-thickness layer whose resistivity is to be measured by a plunge electrode probe, and the agar layer represents an underlying perturbing layer. A micropositioner controls the insertion depth of the four electrodes into the saline solution. With the apparent resistance measured on a semi-infinite-thickness layer of saline solution as standard, measurement results show decreasing apparent resistance and increasing error with increasing electrode insertion depth. This information is important for correct measurement of myocardial resistivity in vivo and in vitro.
AB - The apparent resistance of a finite-thickness layer measured with a four-electrode plunge probe depends on the electrode insertion depth, electrode spacing, and layer thickness, as well as the resistivity ratio of an underlying layer. A physical model consisting of air, a saline solution layer, and an agar layer simulates the real situation of resistivity measurement. The saline layer represents the finite-thickness layer whose resistivity is to be measured by a plunge electrode probe, and the agar layer represents an underlying perturbing layer. A micropositioner controls the insertion depth of the four electrodes into the saline solution. With the apparent resistance measured on a semi-infinite-thickness layer of saline solution as standard, measurement results show decreasing apparent resistance and increasing error with increasing electrode insertion depth. This information is important for correct measurement of myocardial resistivity in vivo and in vitro.
KW - Apparent resistance
KW - Electrode spacing
KW - Four-terminal impedance measurement
KW - In-chamber blood
KW - Insertion depth
KW - Multiple-layer model
KW - Myocardial resistivity
KW - Myocardial thickness
KW - Plunge probe
KW - Probe constant
KW - Resistivity ratio
KW - Saline calibration
UR - http://www.scopus.com/inward/record.url?scp=0033965347&partnerID=8YFLogxK
U2 - 10.1109/10.817618
DO - 10.1109/10.817618
M3 - 期刊論文
C2 - 10646278
AN - SCOPUS:0033965347
SN - 0018-9294
VL - 47
SP - 41
EP - 48
JO - IEEE Transactions on Biomedical Engineering
JF - IEEE Transactions on Biomedical Engineering
IS - 1
ER -