Method and apparatus for measuring retinal blood flow

Details Method and apparatus for measuring retinal blood flow Method and apparatus for measuring retinal blood flow

1980-10-22

1982-08-31

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

128691, 128745, 351 16, 356387, G01P 336

Patent

active

043469914

ABSTRACT:
Blood flow in a retinal blood vessel is measured by detecting the doppler shift imparted to two laser beams intersecting on a portion of the retinal vessel. Twin beams of laser radiation are directed along an optical path into an eye and scattered radiation returned along the path into two photo-multipliers. The twin beams are passed through a beam rotator so that the plane containing them can be aligned along the retinal vessel under measurement. A local oscillator signal for homodying with the doppler shifted laser radiation is obtained from reflections from the eye itself or a separate reflector. This reflector can be moved to impart a frequency shift to the local oscillator signal to remove ambiguities in the doppler measurements. Automatic tracking of small eye movements is provided by a beam deflector and servo motor controlled by a detector. Width of the retinal vessel under measurement is obtained by deflecting returning scattered laser radiation and determining the width of the detector signal change.

REFERENCES:
patent: 3542472 (1970-11-01), Vaniz
patent: 3753616 (1973-08-01), Goethert
patent: 3966324 (1976-06-01), Iten
patent: 4126392 (1978-11-01), House
patent: 4166695 (1979-09-01), Hill et al.
C. E. Riva, Applied Optics, Jan. 1981, vol. 20, No. 1, p. 117.

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