| photoplethysmography |
a technique for assessing blood flow by placing a diode that emits infrared light, along with a sensor, on the surface of the skin over a blood vessel; the amount of light reflected back to the sensor is inversely proportional to the number of red blood cells flowing through the vessel.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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