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应用无损伤性技术于外周循环的测定,主要方法有空气体积描记法、电容体积描记法、多普勒超声速度计法、经皮电磁流量法、阻抗体积描记法、核磁共振流量法和应变仪体积描记法等。美国威斯康辛医学院正在发展其中两种有前途的技术,即经皮电磁流量法及核磁共振流量法。经皮电磁流量法主要根据法拉第电磁感应原理。当一导体在磁场中作切割磁力线移动时,在与磁场和导体移动方向相垂直的方向上将产生一电动势。因血液具有导体性质,所以可用这一原理探测血液运动情况。一块
Application of non-invasive techniques in the determination of peripheral circulation, the main methods are plethysmography, capacitance plethysmography, Doppler ultrasound velocity meter method, percutaneous electromagnetism flow method, impedance plethysmography, nuclear magnetic resonance flow rate method and strain gauge Plethysmography and so on. Wisconsin Medical School is developing two of the promising technologies, percutaneous electromagnetic flow method and NMR flow method. Percutaneous electromagnetic flow method mainly based on Faraday’s principle of electromagnetic induction. When a conductor is cut in the magnetic field to move the magnetic field lines, an electromotive force will be generated in a direction perpendicular to the magnetic field and the moving direction of the conductor. Due to the nature of the blood conductor, this principle can be used to detect blood movement. piece