Assessment and calibration of a low-frequency system for electrical impedance tomography (EIT), optimized for use in imaging brain function in ambulant human subjects

被引：14

作者：

Holder, DS

González-Correa, CA

Tidswell, T

Gibson, A

Cusick, G

Bayford, RH

机构：

[1] UCL, Dept Clin Neurophysiol, London W1N 8AA, England

[2] Univ Caldas, Fac Med, Manizales, Colombia

[3] UCL, Dept Med Phys, London W1N 8AA, England

[4] Middlesex Univ, Dept Elect Engn, London N11 2NQ, England

来源：

ELECTRICAL BIOIMPEDANCE METHODS: APPLICATIONS TO MEDICINE AND BIOTECHNOLOGY | 1999年 / 873卷

关键词：

D O I：

10.1111/j.1749-6632.1999.tb09500.x

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

An EIT system has been produced that has been optimized for imaging impedance changes with scalp electrodes during brain activity in ambulant subjects. It can record from 225 Hz to 65 kHz, has a small headbox on a lead 10 m long, and has software programmable electrode selection, In calibration experiments in a small cylindrical tank filled with potassium chloride solution and samples of cucumber, noise was less than 1% with averaging, and acceptable images were produced at frequencies down to 1800 Hz. This suggests that EIT can he performed at low frequencies, which are likely to give larger signals during brain activity, Future work will include trials in humans and improvement of the current source and isolation.

引用

页码：512 / 519

页数：8

共 14 条

[1]

[Anonymous], MED BIOL ENG COMPUT

[2] Improvement of the positional accuracy of EIT images of the head using a Lagrange multiplier reconstruction algorithm with diametric excitation [J].