TY - JOUR
T1 - In vitro measurement of myocardial impedivity anisotropy with a miniature rectangular tube
AU - Tsai, Jang Zern
AU - Will, James A.
AU - Vorperian, Vicken R.
AU - Hubbard-Van Stelle, Scott
AU - Cao, Hong
AU - Tungjitkusolmun, Supan
AU - Choy, Young Bin
AU - Webster, John G.
PY - 2003/4/1
Y1 - 2003/4/1
N2 - Due to rapid change of fiber orientation, it is difficult to measure myocardial impedivity separately in a longitudinal or transverse fiber direction without mutual influence in the two directions. Previously published values of the longitudinal and the transverse myocardial impedivity were derived indirectly from measurements that mixed the impedivity in all directions. Those values are questionable because the derivations were based on a simplified uniform myocardial fiber model. In this paper, a miniature rectangular tube was devised to facilitate direct measurement of myocardial impedivity in a uniform fiber direction. The average transverse-to-longitudinal ratio of the measured in vitro swine myocardial impedivity was about 1.66 from 1 Hz to 1 kHz and dropped to 1.25 at 1 MHz. The result is important for accurate modeling of the electrical property of myocardium in biomedical research of radio-frequency cardiac catheter ablation.
AB - Due to rapid change of fiber orientation, it is difficult to measure myocardial impedivity separately in a longitudinal or transverse fiber direction without mutual influence in the two directions. Previously published values of the longitudinal and the transverse myocardial impedivity were derived indirectly from measurements that mixed the impedivity in all directions. Those values are questionable because the derivations were based on a simplified uniform myocardial fiber model. In this paper, a miniature rectangular tube was devised to facilitate direct measurement of myocardial impedivity in a uniform fiber direction. The average transverse-to-longitudinal ratio of the measured in vitro swine myocardial impedivity was about 1.66 from 1 Hz to 1 kHz and dropped to 1.25 at 1 MHz. The result is important for accurate modeling of the electrical property of myocardium in biomedical research of radio-frequency cardiac catheter ablation.
KW - Anisotropy
KW - Four-terminal impedivity
KW - Myocardial impedivity
KW - Resistivity
UR - http://www.scopus.com/inward/record.url?scp=0037387664&partnerID=8YFLogxK
U2 - 10.1109/TBME.2003.809475
DO - 10.1109/TBME.2003.809475
M3 - 期刊論文
C2 - 12723067
AN - SCOPUS:0037387664
SN - 0018-9294
VL - 50
SP - 528
EP - 532
JO - IEEE Transactions on Biomedical Engineering
JF - IEEE Transactions on Biomedical Engineering
IS - 4
ER -