An important technique used to monitor cell and organ function, such as brain activity,is________

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Positron emission tomography (PET) is a technique used to monitor cell and organ function, including brain activity. It involves the use of a radioactive tracer that is injected into the body and emits positrons, which are detectable by the PET scanner. This allows for visualization of metabolic and physiological processes in the body, including brain function. Ultrasound, electrocardiograph, X-ray, and mass spectrometry are not typically used for monitoring brain activity.

An Important Technique Used to Monitor Cell and Organ Function