Estimation of the Cerebral Circulation by Tetrapolar Circuit Method Using Magnetic Field.
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概要
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We have proposed an eddy current superposing tetrapolar circuit method to detect the impedance changes in a pair of closely-situated two parts of living tissue independently and simultaneously. In this paper, we applied this method to rheoencephalography (REG), and compared REG measured by this method and that by the conventional method. For simultaneous measurement by the both methods, we used constant currents of three frequency components. Two frequency components of these currents were used for the proposed method and the other one was for the conventional method. Measurements of REG were performed for cases with such as electric stimulation to the pollex or visual stimulation to the eyes. By the proposed method, impedance decreases corresponding to the activation of the brain were exclusively measured in the respective parts of the head, for example, in the contrateral hemisphere for the electric stimulation to the pollex. Such a localized impedance change was also obtained in the occipital part as a result of visual stimulation to the eyes. Fog repetitive experiment of touching stimulation to the face using soft paper, moreover, the impedance change suggesting a habituation process of the brain activity was observed. By the conventional method, however, such changes were not detected. We think, therefore, that the effectiveness of the tetrapolar circuit method using magnetic field for REG measurement was shown by in-vivo measurement.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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