Laser Doppler Measurement Of Coronary Blood Flow Velocity

Michael D. Stern

doi:10.1117/12.937384

1 April 1987 Laser Doppler Measurement Of Coronary Blood Flow Velocity

Michael D. Stern

Proceedings Volume 0713, Optical Fibers in Medicine II; (1987) https://doi.org/10.1117/12.937384
Event: Cambridge Symposium-Fiber/LASE '86, 1986, Cambridge, MA, United States

Abstract

Clinical measurement of coronary flow reserve by means of a fiber-optic laser Doppler catheter requires the measurement of blood flow velocity with minimal interference from the flow disturbance caused by the catheter itself. Study of Doppler scattering in blood by a transport theory approach shows that use of two spatially separated fibers for illumination and collection of light would give greater penetration of the velocity sensing region through the hydrodynamic boundary layer of the catheter. The design of a laser-Doppler velocimeter using dual multimode fibers with frequency shifted heterodyne detection is described. Flow velocity is estimated from the frequency moments of the spectrum, which are determined in realtime by analog signal processing without the use of spectrum analysis. Signal to noise analysis indicates that the output noise of the velocity estimate should be easily adequate to permit measurement of coronary flow reserve and resolution of the phasic characteristics of flow velocity.

Citation Download Citation

Michael D. Stern "Laser Doppler Measurement Of Coronary Blood Flow Velocity", Proc. SPIE 0713, Optical Fibers in Medicine II, (1 April 1987); https://doi.org/10.1117/12.937384

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