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  • Plethysmographs designed for non-invasive measuring and recording of data and graphics (i.e., a plethysmogram) of the volume and variations in the volume of the brain due to the presence and flow of blood in the vascular system based on the measurement of the volume waveform and amplitude. This technique is known as segmental plethysmography, and also as pulse volume recording (PVR) plethysmography, and pneumo plethysmography. These devices include sensors for measuring in the scalp or neck. They are used in assessing diseases related to the cerebral blood circulation.
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