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Detectors designed to evaluate blood flow using transcutaneous, noninvasive methods. These detectors may use one of several techniques, including ultrasound and electromagnetic waves. Blood flow detectors can sense blood flow in all vessels outside the skull and thorax (i.e., not blocked by bone or air), determining the extent of peripheral vascular blood flow restrictions (e.g., clots, stenosis), but they do not measure any characteristic of the flow. They are used in the assessment of atherosclerosis, varicose veins, and venous thrombosis and in the diagnosis of the vascular state of the extremities.
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