US 5,115,137 A · Diagnosis by means of fluorescent light emission from tissue

Abstract

A sample (1) is irradiated by a pulse from a laser (2), creating fluorescence radiation, which is brought, in imaging relation or otherwise, to a detector (6) sensing from the same sample (1) in a plurality of spectral intervals (6A-6D), for obtaining intensity values. The radiation may be sensed in imaging relation, creating a multiplicity of said pluralities. The spectral intervals may be wavelength defined by passband filters (5A-5D) or time interval defined time spectral intervals controlled by a computer (7), which makes a numerical evaluation comprising a division. The tissue character may then be evaluated from the evaluation.

Claims10

Dependent claims

A method for determining tissue character by fluorescence, comprising the steps of

i. exciting the tissue with a laser wavelength below 500 nm,
ii. detecting a fluorescence intensity within a plurality of predetermined spectral intervals for obtaining a plurality of numerical intensity values, at least two of said predetermined spectral intervals comprising spectral intervals centered on wavelengths having substantially equal absorption values in blood,
iii. performing an arithmetic operation on said numerical intensity values including at least one division operation.

Dependencies are inferred from the claim text.

Diagnosis by means of fluorescent light emission from tissue

Life of this patent

Diagnosis by means of fluorescent light emission from tissue

Life of this patent

Abstract

Claims10