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Detectors designed to evaluate the presence of cerebrospinal fluid flow through a hydrocephalic shunt using the indicator dilution technique, which detects a transcutaneous change in temperature as cooled cerebrospinal fluid flows through the subcutaneous portion of a shunt. These detectors typically consist of a cutaneous temperature sensor, a data acquisition unit, and software to analyze the thermal data. The patient\'s skin is cooled along the shunt upstream from the sensor, and then the temperature sensor detects any thermal change downstream from where the shunt was cooled.
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