Method for measuring internal information in scattering medium and apparatus for the same

Patent 5517987 Issued on May 21, 1996. Estimated Expiration Date:

June 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method of and apparatus for measuring the inside information of substance with the use of light scattering
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Inventor

Tsuchiya, Yutaka

Assignee

Hamamatsu Photonics K.K.

Application

No. 252227 filed on 06/01/1994

US Classes:

600/328Hemoglobin

Examiners

Primary: Sykes, Angela D.
Assistant: Winakur, Eric F.

Attorney, Agent or Firm

Cushman Darby & Cushman

Foreign Patent References

64-88340 JP. 04/13/1989
1174940 JP. 07/13/1989
4110751 JP. 04/13/1992
2228314 GB. 08/13/1990
8912223 WO. 12/13/1989
9004941 WO. 05/13/1990
9201216 WO. 01/13/1992
9221283 WO 12/13/1992

International Class

A61B 005/00

Foreign Application Priority Data

1993-06-02 JP

Abstract

A method of measuring internal information in a scattering medium, and an apparatus for the same of the present invention measure internal information in the scattering medium by measuring light diffused during propagation in the scattering medium while receiving the influence of the scattering and absorption, and performing arithmetic processing to the measured values. At this time, the three or more kinds of the detected signals (measured values) measured at three or more different kinds of distances between the light incident position and the photodetection point are processed by utilizing dependencies of the behavior of light diffused during propagation in the scattering medium and the resulting signal, that is, a photodetection signal on characteristics such as a scattering constituent, or an absorption constituent in the scattering medium and the concentration. The measured internal information is the absolute value of a scattering coefficient or a transport scattering coefficient of the scattering medium, and the information associated with a specified scattering constituent or a specified absorption constituent can be measured by processing the measured internal information.

Other References

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