Impedance Mapping Method and System for Blood Flow Measurement in Brain
Ichiro Hieda, Yasuo Kuchinomachi, Sigeru Sato and Hiroyuki Kodama
Industrial Products Research Institute, 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan
The authors have been engaged in the development of a brain blood flow mapping system based on the impedance technique which is more convenient and economical than the existing observation systems of blood flow in brain using radioisotopes or various types of CTs. This system is capable of non-invasive measurements and suitable for screening examinations of stroke in group examinations. A prototype system has recently been completed. This paper examines how sensitively changes in the resistivity of the internal tissue of a head affects voltage readings in impedance measurement, which results in the creation of grid-electrodes. The paper then introduces the prototype system, focusing mainly on the principle of impedance measurement using the new grid-electrodes and also on analysis of data.