Surgery – Truss – Pad
Patent
1996-05-21
1998-08-04
Lateef, Marvin M.
Surgery
Truss
Pad
128633, 128664, 128665, 356398, A61B 500
Patent
active
057878870
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to an apparatus for examining tissue with light.
2. Description of the Prior Art
Known apparatuses for examining tissue with light can operate with visible, NIR or IR light. The wavelength of the visible light lies between 380 and 780 nm, that of NIR light, i.e. of near-infrared light, lies between 780 nm and 1.5 .mu.m and that of IR light, i.e. of infrared light, lies between 1.5 .mu.m and 1 mm, whereby the wavelength range from 660 nm through 1.2 .mu.m is especially suitable.
Many optical properties of tissue, for example the absorption, the scatter and the spectral properties, can be identified by irradiation with light. For example, it is therefore possible in mammary diagnostics to identify tissue modifications in that light is beamed into the mammary, the light emerging therefrom is detected and the information acquired in this way is interpreted in a suitable way.
The problem arises in known apparatus (see, for example, German OS 41 28 744) that the information acquired by detecting the emerging light can only be interpreted with difficulty since the contrast between potential inhomogeneities and the surrounding tissue is often too low.
SUMMARY OF THE INVENTION
The invention is therefore based on the object of fashioning an apparatus of the type initially described wherein the information acquired by detecting the emerging light can be interpreted better.
This object is inventively achieved in an apparatus for examining tissue with light comprising examination with light, and of the light emanating from the means for detection transmitted through the tissue under examination for both transirradiation directions.
As used herein, bidirectional transirradiation means that work is carried out with two opposite transirradiation directions, whereby the optical axis is substantially the same for both transirradiation directions. As a result of the great scatter to which light is subjected to in the tissue in the transirradiation of tissue, inhomogeneities or absorbers contrast more highly from the surrounding tissue the closer they lie to the means for detection, i.e. to that surface through which the light to be detected emerges from the tissue. Since transirradiation is bidirectional given the inventive apparatus, a different contrast with which the inhomogeneity contrasts with the surrounding material is achieved for the two transirradiation directions, except for that special case wherein an inhomogeneity has the same spacing from the means for detection for both transirradiation directions. Information that can be interpreted better is thus available since the more beneficial, i.e. higher-contrast information can be used to form the basis for the interpretation. At the same time, information is acquired as to whether an inhomogeneity lies closer to the one or to the other surface that limits the transirradiated tissue region in transirradiation direction.
In order to prevent the properties of the transirradiated tissue from being able to change significantly during the time that elapses between the transirradiation in the two transirradiation directions, in a version of the invention provides that the bidirectional transirradiation ensues quasi-simultaneously. In a further version of the invention the means for transirradiating the tissue under examination in fact transirradiate simultaneously in both transirradiation directions. A mutual influencing of the two transirradiation directions can be avoided by differently modulating the light respectively in the two transirradiation directions. The light for the two transirradiation directions is preferably amplitude-modulated with different modulation frequencies. As a result of the different modulation, it is easily possible to use only the light for the two transirradiation directions by demodulating the output signal of the means for detection in a suitable way.
In order to prevent mutual influencing of the two transirradiation directions, diaphragm means can also be p
REFERENCES:
patent: 5309907 (1994-05-01), Fang et al.
Lateef Marvin M.
Mantis Mercader Eleni
Siemens Aktiengesellschaft
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