Aspects of instrumentation design for impedance imaging

被引：16

作者：

Murphy, D. ^{[1
]}

Rolfe, P. ^{[1
]}

机构：

[1] Biomedical Engineering Centre, University of Oxford, Oxford, United Kingdom

来源：

Clinical Physics and Physiological Measurement | 1988年 / 9卷 / SUPPL. A期

关键词：

Data Processing--Data Acquisition - Demodulators--Efficiency - Electric Measurements--Impedance - Electronic Circuits--Design - Image Processing--Reconstruction;

D O I：

10.1088/0143-0815/9/4A/002

中图分类号：

学科分类号：

摘要：

This paper takes the circuit for a general-purpose impedance imaging data measurement system and analyzes the importance of several components. For high accuracy it is shown that stray capacitances in the input circuitry are the major problem, although the use of a phase-sensitive demodulator can minimize this problem. It is shown that harmonic distortion in the constant-current generator can cause errors which are, however, reduced if a linear multiplying demodulator is used rather than a switching demodulator.

引用

页码：5 / 14