Siemens Aktiengesellschaft

Thomas Von Der Haar

Bjoern Heismann

Juergen Leppert

Thomas Flohr

Herbert Bruder

Björn Heismann

Quirin Spreiter

Karl Stierstorfer

Steffen Kappler

Daniel Niederlöhner

Christian Schröter

Willi A Kalender

Bernd Ohnesorge

Edgar Kraft

Thomas Reichel

Christoph Josef Brabec

Clemens Joerger

Gerhard Kohl

Theobald Fuchs

Clemens Doubrava

Tillman Riess

Johannes Kippes

In a method, with a current measurement, the history of the radiation exposure of the X-ray detector is taken into account with respect to the overall X-ray detector or subareas of the X-ray detector, in respect of a reduction in the measurement sensitivity produced as a result and a recovery of the reduction in the measurement sensitivity, and the determined measuring signal is corrected with a correction factor which is dependent on the history of the radiation exposure. Furthermore, an X-ray recording system includes a detector which includes a plurality of detector elements, which are read out in groups channel by channel and a read-out apparatus with computer-assisted device for correcting read-out detector data prior to a further processing of the detector data to form projective or tomographic images.

Method for correcting detector data of an X-ray detector and X-ray recording system

In a radioscopic method and device to generate projections of the inside of an examination subject that is located in an examination space of a data acquisition unit, a number of ray beams are generated that are directed toward the examination space and that each exhibit a fan angle in a rotation plane. The number of ray beams are rotated in the rotation plane in a rotation direction the examination space, while the fan angle is varied during the rotation.

Method and device to generate projections of the inside of an examination subject

The invention relates to a radiation detector for detecting radiation impinging in a detection zone, having detector elements which are arranged in the form of a preferably two-dimensional array in rows and columns running orthogonally with respect to one another and each have a scintillator and a photodiode interacting with the latter. In this case, detector elements arranged at the edge of array are provided, whose scintillators have an extent transversely with respect to the edge of the array which is larger than is necessary for encompassing the detection zone.

Radiation detector with a detection field comprising scintillators and photodiodes

A method is for testing the quality of a detector module for an x-ray computer tomograph. In order to achieve a quality test of detector modules, it is proposed in at least one embodiment, to fit a holding device with at least one reference detector module and with the detector module to be tested, and subsequently to evaluate both the reference signals supplied by the reference detector module and the test signals supplied by the detector module to be tested.

Method for testing the quality of a detector module for an x-ray computer tomograph

A detector for a tomography unit, in particular an X-ray computer tomograph, includes a number of detector modules arranged next to one another in a z-direction and in a &#x3c6;-direction running perpendicular thereto. In order to specify the adjustment, the detector modules bear against an adjusting plate on the beam input side. First adjusting devices are provided on the detector modules on the beam input side engaging with second adjusting devices, corresponding thereto and provided on the adjusting plate, for the purpose of accurately positioning the detector modules.

Detector for a tomography unit

An x-ray detector includes a large number of pixels, each of the latter being configured from one or more sub-pixels. Each of the sub-pixels include a detector material for the direct conversion of incident X-ray radiation into an electric signal. A device for converting the electric signals into corresponding digital signals is associated with each of the sub-pixels and the detector is also equipped with a device for processing said digital signals into a combined digital signal representing the number and/or energy of the X-ray quanta that are incident on the pixel.

X-ray detector

An X-ray detector is for a CT device and includes a phosphor layer for generating electromagnetic radiation as a function of the occurrence of X-radiation, and a photodetector layer for detecting the electromagnetic radiation generated by the phosphor layer. The phosphor layer includes ceramic material and the photodetector layer includes organic material. A process is further for producing an X-ray detector, including the steps of producing a phosphor layer from a ceramic material and applying a photodetector layer made from an organic material to the phosphor layer via a spinning, printing or beam/jet process or by sticking it on as a film. It is optionally possible to provide a further process step for polishing the surface of the phosphor layer before applying the photodetector layer.

X-ray detector including a scintillator with a photosensor coating, and a production process

An image detector for an x-ray device includes photosensors which have at least two contacts on which an electrical signal occurs when x-rays are detected. In each case, at least one contact of the photosensors is arranged on its rear side, facing away from the image source. Further, the material used for the photosensors is an organic photodiode material.

Image detector for x-ray devices with rear-contact organic image sensors

The invention relates to a computer tomograph comprising a detector unit () consisting of a plurality of detectors () for identifying X-ray radiation (). According to the invention, the individual detectors () of the detector unit () are configured to receive incident quanta of the X-ray radiation () and to record the received X-ray radiation (), both in terms of its intensity and in terms of the quantum energy of the individual X-ray quanta of the received X-ray radiation (). The invention also relates to a corresponding method for identifying X-ray radiation by means of a computer tomograph that comprises a detector unit () consisting of a plurality of detectors ().

Computer tomograph comprising energy discriminating detectors

A method is for restoring a signal of a defective channel of a beam detector, which has a multitude of channels and by means of which projections are recorded from different directions of projection. The channels of the beam detector each have a detector element with channel electronics connected downstream thereform. The signal of the defective channel is restored while using neighboring signals of an M-neighborhood of the same projection and from adjacent signals of an M-neighborhood of additional projections.

Method and medical device designed for implementing this method

An image detector is for detecting electromagnetic radiation, in particular X-ray radiation. It includes a carrier layer and a photosensor carried by the carrier layer. Each of the carrier layer and photosensor both have a nonvanishing transparency to the electromagnetic radiation. The image detector includes two or more carrier layers and photosensors carried thereby, arranged one above the other, so that the electromagnetic radiation can pass through them one after the other.

Image detector for X-ray radiation

A computed tomography (CT) device has adjustable operational parameters and a control unit and a unit for preselecting a combination of operational parameters for an examination to be carried out. The control unit determines, for the case where a combination of operational parameters which might lead to an impermissible operating state is preselected for an examination to be carried out, a value for at least one operational parameter which deviates from the preselected combination of operational parameters and for which the planned examination can be carried out in a manner avoiding the impermissible operating state without a significant reduction in the image quality by comparison with the preselected combination of operational parameters.

Computed tomography apparatus with automatic parameter modification to prevent impermissible operating states

A computed tomography apparatus has a radiation source from which a beam is emitted which has a fan angle and can be moved about a system axis within a measuring field defined by the fan angle in order to scan an object under examination, and a detector system for detecting the radiation from the radiation source and which supplies output signals corresponding to the received radiation, which are fed to a computer. From these output signals, the computer reconstructs images of the object under examination with reference to a reconstruction field which is larger than the measuring field.

Computed tomography apparatus wherein an image of a subject is reconstructed for a reconstruction field that is larger than the measuring field

A detector array for detecting X-rays has a number of sensor elements that each have a scintillator element, which is sensitive to X-rays, and a photo-electrical transducer optically coupled thereto. An intermediate areas separating adjacent scintillator elements from one another is present between each two adjacent scintillator elements. Scintillator material is present in the intermediate area. In a production method for such a detector array for detecting X-rays, separating channels are introduced into a layer that is composed of scintillator material, which is sensitive to X-rays, without completely separating the layer.

X-ray detector array and method for manufacturing same

A radiation detector for an X-ray computed tomography apparatus, has a number of detector modules mounted side-by-side, each detector module having a sensor array composed of a number of sensor elements. For simplifying the maintenance of the detector, each detector module contains an electronic memory arrangement for storing data relating to the calibration of each of the sensor elements.

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Nürnberg, Germany

Thomas Von Der Haar