Blood Flow Detection Using the Flat Crossed-Coil Nuclear Magnetic Resonance Flowmeter

Arterial blood flow signals have been obtained noninvasively from the posterior tibial artery, the brain, and the region of the heart at proton resonance frequencies of 21.4 MHz and 75 MHz. For these studies, the subjects were placed in a superconducting solenoid electromagnet with a 63.5 cm diameter warm bore, 185 cm long. A flat crossedcoil detector was used. The signals were processed by a synchronous detector.