Reproducibility of acupuncture point’s impedance based on Hausdorff distance
LI Jiang1, HUANG Yi-jun1, LIU Zheng1, LIU Xiao-hui1, BAO Ye-hua2, CHU Jia-mei2
1. Institute of Industrial Process Control, Zhejiang University, Hangzhou 310027, China； 2. Hangzhou Hospital of Traditional Chinese Medicine, Hangzhou 310007, China
An impedance scanning system of acupuncture points and meridians based on Cartesian robot was designed in order to achieve the automatic body electrical impedance scanning. Hausdorff distance was applied to evaluate similarity between the different data curves in order to test the stability and reproducibility of the impedance scanning system. The same straight line was selected which lay in two scapular bottom points on human back as the scanning track. TH2825 LCR meter was used to measure impedance data produced in Tonghui company. The excitation signal was sine wave which amplitude was 1 V, frequency was 1 kHz and the measuring range was set at 100 kΩ. The Cartesian coordinate robot can be modulated to measure the impedance between the gel electrode and the Ag electrode along the above-mentioned straight line automatically and continuously. Seven healthy subjects were selected in total, which were measured in the environment that temperature was 25 ℃ and moisture was 50%. Each subject took five times of continuous scanning on the same straight line. The Hausdorff distance was applied in order to evaluate the reproducibility and similarity between the sampling impedance data curves which were acquired from the same subject. Experimental results showed that the reproducibility and stability of the impedance measurement system was favorable.
LI Jiang, HUANG Yi-jun, LIU Zheng, LIU Xiao-hui, BAO Ye-hua, CHU Jia-mei. Reproducibility of acupuncture point’s impedance based on Hausdorff distance. J4, 2011, 45(10): 1777-1780.
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