Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1996-05-29
1998-06-30
Cohen, Lee S.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
A61B 600
Patent
active
057725985
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/DE94/1492 which is based upon German national application P4342526.7 of 15 Dec. 1993 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a device for the translumination of an object.
1. Background of the Invention
When a diffuse scatterer, for example human tissue of the hand, is transluminated with light of high intensity it appears to be translucent. In a disadvantageous manner, however, the local resolution is very poor and is not suitable to provide an information-rich, location-dependent, image-true reproduction of the scatterer.
It is the object of the present invention to provide a device for transluminating an object with especially visible light with high local resolution.
SUMMARY OF THE INVENTION
The object is achieved with a device having a code aperture through which parallel light can pass, means for focussing this coded light, an object in the focal plane of the focussed light, means for collimating the light traversing the object, and a light-sensitive detector collecting this light.
In particular, the device has means with the aid of which parallel light passes through a coded aperture and this light is then focussed. The object to be transluminated is positioned in the focal plane of the focussed light. Means can then be provided which allows a scanning within the focal plane by shifting it relative to the transluminated object (the diffuse scatterer).
2. Object of the Invention
The invention further has means for collimating the light passing through the object. Finally, a light-sensitive detector is provided which collects the so-collimated light. The detector signal is thus applied to an electronic image processor. As a result, even with diffusion scattering, a high local resolution of the scatterer (as for example the human hand) can be obtained. A preferred embodiment has, means for shifting in the focal plane for the purpose of selective translumination of individual regions of the object. Thus the diffuse scatterer can be repeatedly scanned to yield, in total, a complete image of the transluminated objects by joining the individual signals from local scanning.
An advantages embodiment of the invention is provided when a coding pattern is provided in the aperture which permits cross correlation in the evolution of the measured detector signal.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a schematic illustration of the individual components of the device according to the invention along the light path from the source of the detector;
FIG. 2a is a plot of the intensity of the light as a function of the location of the receiver for the code without scattered light;
FIG. 2b is a plot of the intensity of the light as a function of location at the receiver for the code with scattered light with weak absorption; and
FIG. 2c is a plot of the intensity of the light as a function of location at receiver for a weakened code with stronger absorption.
SPECIFIC DESCRIPTION
The device shown in FIG. 1 has a light source 1 which is so positioned in the focal plane of a lens 2 that downstream of this lens parallel light emerges from this lens 2 and passes through a coded aperture 4 and is then focussed by a further lens 5. In the focal plane of the lens 5, a diffuse scatterer 6 to be transluminated is positioned. The light passing through the latter impinges, after traversing a diaphragm 7 for collimation, upon a detector 8, especially a sensor array 8. From there the electrical signal which is picked up is fed to an electronic image processor 9. The device is a scanning device not shown in detail which enables the shifting of the diffuse scatterer 6 in the focal plane of the lens 5 so that successive scannings of the object can be achieved with the aid of this device.
In particular, the light source
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"Edge Inspection of Semiconductor Substrates", Technical Disclosure Bulletin vol. 33, No. 4, Sep. 1990.
"Reticle Inspection Using Diffraction Pattern Masking", Xerox Disclosure Journal, vol. 9, No. 1, Jan./Feb. 1984.
Cohen Lee S.
Dubno Herbert
Forschungszentrum Julich GmbH
Yarnell Bryan K.
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