Nuclear Magnetic Resonance (NMR) Cylindrical Blood Flowmeter

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Abstract
In vitro tests were performed to evaluate a single-sideband crossedcoil cylindrical NMR flowmeter, for the noninvasive measurement of arterial flow rates through a cross-section of human limbs. The output signals from the NMR flowmeter, a Doppler ultrasound velocimeter, and an electromagnetic (EM) flowmeter were comparable. The frequency response showed an upper frequency 3db roll-off point of 2.1 Hz (126 pulses per minute). The relationship between the NMR peak-to-peak output voltage and pak-flow was linear in the range of physiological flow. Calibration in the linear region was essentially independent of tube positioning and tube cross section. The instrument detected flow bidirectionally, but gave a 2 times greater output voltage in the preferential direction. The NMR flowmeter is appropriate to estimate average flow rates with the human subject at rest. This NMR flowmeter is a contactless instrument, and flows can be measured unimpaired by clothing, bandages or cast.

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