Sirona Dental Systems Gmbh

Sirona Dental Systems Gmbh & Co. Kg

Uwe Zeller

Ulrich Schulze-Ganzlin

Christian Beckhaus

Michael Dobert

Werner Günther

Martin Eckert

Tilman Phleps

Werner Gunther

Michael Doebert

Tilmann Phleps

Roland Bonk

An X-ray-sensitive camera comprising a first X-ray-sensitive image detector for the creation of a first tomographic image with a first depth of focus profile, a second X-ray-sensitive image detector for the creation of a second tomographic image with a second depth of focus profile, and an adjustment device for moving as desired the first image detector or the second image detector into proper alignment with an X-ray emitter for the creation of a respective X-ray image, the second depth of focus profile being smaller than the first depth of focus profile, the image-sensitive active surface of the second image detector being at least twice as large as an image-sensitive active surface of the first image detector in a first dimension, and/or the second image detector is not more than half as large as the first image detector in a second dimension, the first and second image detectors being disposed in a common casing with the camera, and the second image detector is disposed alongside the first image detector.

X-ray sensitive camera comprising two image receivers and X-ray device

The invention relates to an X-ray sensitive camera () comprising a first X-ray sensitive image receiver (), for creating a first tomogram with a first depth of field profile, in addition to a second X-ray sensitive image receiver () for creating a second tomogram with a second depth of field profile. The invention also relates to an X-ray device comprising an image receiver () that is contained in an X-ray sensitive camera (), in addition to an X-ray emitter () with a primary diaphragm () and adjusting means () for the image receiver and/or X-ray emitter and/or primary diaphragm and/or a combination thereof. The camera is equipped with a second image receiver (), which can be brought into the beam path () of the X-ray emitter using the adjusting means ().

A method is proposed for compensating for the dark current of an electronic sensor having a plurality of pixels with an individual dark-current response, radiation for producing an image signal (BS) being directed from a beam source ( ) onto a detector arrangement ( ) containing the sensor, and a recording being taken with different clock-out rate (v) (integration time) by reading the detector signal (S) present in the pixels of the sensor, in which, before the beginning or after the end of the recording with radiation, the sensor is read out without radiation with at least two different clock-out rates (v , v ) and at least two dark-current signals (DC , DC ) are thereby picked up for each pixel, in which the dark-current signals (DC , DC ) that have been read out are then used to calculate a dark-current value (DV) of individual pixels of the sensor as a function of the clock-out rate (v), and in which a correction is then made, using the dark-current value associated with each pixel, to the detector signal (S) with the dark-current signal superimposed on it in order to calculate the picture value (PV).

Method for compensating the dark current of an electronic sensor having several pixels

A sensor that can be placed intraorally in the mouth of a patient for the production of tooth/jaw exposures of a patient has a narrow housing, approximately rectangular in a top view, for an image detector and a control circuit board to which lines are connected, which can be connected, with a free end, with an image processing unit via a connecting cable exiting from the housing at the back wall of the housing. At least one narrow side of the housing has a rounded shape that is adapted to the anatomical characteristics of the upper jaw of an average patient.

Sensor that can be placed intraorally in the mouth of a patient for the production of tooth/jaw exposures of a patient

In a method and an apparatus for producing X-ray tomograms of the jaw and skull of a patient, a detector arrangement having at least one x-ray detector is provided. The radiation-sensitive area of the detector is a sub-area of the total detector area required for the subject exposure. The image exposure ensues in a number of chronologically separate sections in which, following a first sub-exposure, the detector arrangement is displaced along the longitudinal axis and/or the transverse axis of the detector surface and the diaphragm aperture of the primary diaphragm associated with the x-ray source is simultaneously correspondingly adapted so that the position of the x-ray beam is shifted so that it still strikes the detector appropriately after the detector is displaced.

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Biberach/Riss, Germany

Uwe Zeller