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  • Blood-flow detectors that use ultrasonic techniques (e.g., Doppler effect) to determine the extent of peripheral vascular blood flow restrictions (e.g., clots, stenosis). These devices typically consist of a radio-frequency unit with and ultrasonic transducer probe; and an audio or visual indicator. Ultrasonic blood flow detectors can sense transcutaneously blood flow in all vessels outside the skull and thorax (i.e., vessels not blocked by bone or air); they are used in the assessment of atherosclerosis, varicose veins, and venous thrombosis; and also in the diagnosis of the vascular state of the extremities.
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