Accuracy considerations in catheter based estimation of left ventricular volume.
Accuracy considerations in catheter based estimation of left ventricular volume.
复制标题
基于导管的左心室容量估计的准确性考虑因素。
DOI：
10.1109/iembs.2010.5627712
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Feldman,MarcD
中科院分区：
文献类型：
--
作者：
Pearce,JohnA;Porterfield,JohnE;Larson,ErikR;Valvano,JonathanW;Feldman,MarcD
Cardiac volume estimation in the Left Ventricle from impedance or admittance measurement is subject to two major sources of error: parallel current pathways in surrounding tissues and a non uniform current density field. The accuracy of volume estimation can be enhanced by incorporating the complex electrical properties of myocardium to identify the muscle component in the measurement and by including the transient nature of the field non uniformity. Cardiac muscle is unique in that the permittivity is high enough at audio frequencies to make the muscle component of the signal identifiable in the imaginary part of an admittance measurement. The muscle contribution can thus be uniquely identified and removed from the combined muscle - blood measurement. In general, both error sources are transient and are best removed in real time as data are collected. This paper reviews error correction methods and establishes that the relative magnitudes of the error concerns are different in small and large hearts.
