X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1994-11-28
1996-04-30
Hannaher, Constantine
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 982, 25037007, G01N 2304
Patent
active
055132529
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a dental x-ray diagnostics installation of the type having an x-ray radiator, a CCD image detector arranged diametrically relative thereto and following the subject to be transirradiated in a radiation propagation direction, control electronics with a control unit which drives the image detector, an image processing unit which edits the signals acquired from the image detector and supplies them to an image presentation unit, and an operating device with which the x-ray radiator can be switched on and off.
2. Description of the Prior Art
European Application No. 0 415 075 discloses an x-ray diagnostics installation of the above type. In order, in particular, to make the connecting cable between x-ray radiator and the control electronics with the image processing unit dispensable, a radiation-sensitive sensor is arranged in the reception area of the image detector in this known x-ray diagnostics installation. According to an advantageous development of this known installation, the sensor can also be arranged inside the area of the image detector.
WO-A-9-222 188, which does not have prior publication, discloses an apparatus wherein an image detector is employed instead of a film that is sensitive to x-rays; in this apparatus, however, image data are not clocked and evaluated; on the contrary, the static signals that correspond to the supply current flowing to and from the CCD sensor are continuously subjected therein to a threshold check.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an x-ray diagnostics installation of the type generally described above which does not require the use of a radiation-sensitive sensor disposed in the reception area of the image detector.
The above object is achieved in accordance with the principles of the present invention in a dental x-ray diagnostics installation of the type generally described above, wherein a clock generator is connected to the CCD image detector for continuously reading out the CCD image detector to obtain image data, and wherein the image data are continuously subjected to a threshold comparison to determine whether the x-ray radiator is currently activated, and is emitting x-rays, or whether the x-ray radiator has been deactivated. When the x-ray radiator is activated, as determined by the threshold comparison, the clock generator operates the CCD detector in an exposure mode, and when the x-ray radiator is deactivated, the clock generator operates the image detector in a read-out mode.
Because the image detector is continuously read out and the incoming values are thus continuously subjected to a threshold check that immediately recognizes the presence of a radiation and correspondingly activates the control electronics, the radiation-sensitive sensor provided in known devices in the area of the image detector can be forgone. The control electronics is automatically switched on as soon as the x-ray radiator is activated via the operating device.
DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention shall be set forth in greater detail below with reference to the drawings.
FIG. 1 is an overview of the x-ray diagnostics installation of the invention;
FIG. 2 is a block circuit diagram of the diagnostics installation of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The diagnostics installation shown in FIG. 1 includes an x-ray radiator 1 that contains an x-ray tube (not referenced in detail) with a high-voltage generator operable in a known way, held in a suitable way with a holder 2 such that it can be aligned to the subject 3 (tooth or jaw of a patient) to be transirradiated. In the case of an intraoral diagnostics installation, the holder 2 can be composed in a known way of a floor or ceiling stand at which the x-ray radiator 1 is adjustable in height, slope and swivel direction. In the case of a panorama x-ray diagnostics installation, the holder also contains the image detector (referenced 7) that is arra
REFERENCES:
patent: 4901336 (1990-02-01), Nishiki
Blaschka Eriks
Schulze-Ganzlin Ulrich
Hannaher Constantine
Siemens Aktiengesellschaft
Wong Don
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