Measuring arrangement for examining a subject with visible, NIR

Details Measuring arrangement for examining a subject with visible, NIR Measuring arrangement for examining a subject with visible, NIR

1992-08-26

1994-05-10

Sykes, Angela D.

Surgery

Truss

Pad

128664, 128665, A61B 500

Patent

active

053099079

ABSTRACT:
An apparatus for examining tissue in vivo by means of the optical properties of the tissue generates a measuring chirp signal which is introduced into a tissue-containing subject as a coherent optical chirp signal. The parts of the measuring chirp signal emerging from the subject are superimposed with a reference chirp signal to form a superposition signal that is supplied to a filter that only allows those parts of the superposition signal to pass that represent those parts of the measuring chirp signal emerging from the subject which have traversed a defined, optical path length within the subject.

REFERENCES:
patent: 5122974 (1992-06-01), Chance
patent: 5213105 (1993-05-01), Gratton et al.
"Cerebral Oxygenation Measuring System NIR-1000 (Tentative Data)" Hamamatsu Photonics K.K. System Division (Sep. 1987).
"Optical-Spectroscopy," Egan et al., Acta Radiologica, vol. 29, Fasc. 5, Sep.-Oct., 1988.
"Cerebral Monitoring in Newborn Infants by Magnetic Resonance and Near Infrared Spectroscopy," Delpy et al., Departments of Medical Physics and Bioengineering, Pediatrics and Physiology, Iniversity College London.
"Estimation of Optical Pathlength Through Tissue from Direct Time of Flight Measurement," Delpy et al., Phys. Med. Biol., 1988, vol. 33, No. 12, pp. 1433-1442.
"Distance Measurement by the Wavelength Shift of Laser Diode Light," Kikuta et al., Appl. Opt., vol. 25, No. 17, Sep., 1986, pp. 2976-2980.
"Speckle Interferometry," Ennos, in Laser Speckle and Related Phenomena, Dainty, Ed. 1984, pp. 203-253.

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