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impedance measurement

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  • Focused Impedance Measurement — The Focused Impedance Measurement is a recent technique for measurement of tissue impedance in the human body with improved zone localization compared to conventional methods. This method was proposed and developed at the Biomedical Physics… …   Wikipedia

  • Impedance cardiography — (ICG) is a hemorheology technique of using sensors to detect the properties of the blood flow in the Thorax.IntroductionImpedance cardiography (ICG), also referred to as thoracic electrical bioimpedance (TEB) and electrical impedance… …   Wikipedia

  • Impedance phlebography — Impedance phlebography, or impedance plethysmography (IPG), is a non invasive medical test that measures small changes in electrical resistance of the chest, calf or other regions of the body. These measurements reflect blood volume changes, and… …   Wikipedia

  • Measurement microphone calibration — In order to take a scientific measurement with a microphone, its precise sensitivity must be known (in volts per Pascal). Since this may change over the lifetime of the device, it is necessary to regularly calibrate measurement microphones. This… …   Wikipedia

  • Impedance —   The opposition to power flow in an AC circuit. Also, any device that introduces such opposition in the form of resistance, reactance, or both. The impedance of a circuit or device is measured as the ratio of voltage to current, where a… …   Energy terms

  • impedance —    A measurement of the resistance to an electrical current that a transmission medium offers (measured in ohms) …   IT glossary of terms, acronyms and abbreviations

  • Electrical impedance — Electromagnetism Electricity · …   Wikipedia

  • Bioelectrical impedance analysis — (BIA) is a commonly used method for estimating body composition. Since the advent of the first commercially available devices in the mid 1980s the method has become popular owing to its ease of use, portability of the equipment and its relatively …   Wikipedia

  • Antenna measurement — techniques refers to the testing of antennas to ensure that the antenna meets specifications or simply to characterize it. Typical parameters of antennas are gain, radiation pattern, beamwidth, polarization, and impedance.The antenna pattern is… …   Wikipedia

  • Non-invasive intracranial pressure measurement methods — Increased intracranial pressure (ICP) is one of the major causes of secondary brain ischemia that accompanies a variety of pathological conditions, most notably, traumatic brain injury (TBI), stroke, and intracranial hemorrhages. However, aside… …   Wikipedia

  • Output impedance — The output impedance, source impedance, or internal impedance of an electronic device is the opposition exhibited by its output terminals to an alternating current (AC) of a particular frequency as a result of resistance, inductance and… …   Wikipedia

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