Patent application number | Description | Published |
20100074397 | Method for detecting X-ray radiation and X-ray system - A method is disclosed for detecting X-ray radiation from an X-ray emitter. In at least one embodiment of the method, an electric pulse with a pulse amplitude characteristic of the energy of a quantum is generated when a quantum of the X-ray radiation impinges on a sensor, wherein a number of threshold energies are predetermined. When the pulse amplitude corresponding to the respective energy is exceeded, a signal is emitted each time the pulse amplitude corresponding to a respective threshold energy is exceeded. At least one embodiment of the method permits reliable and high-quality imaging, even in image regions with high X-ray quanta rates. To this end, at least one of the threshold energies is predetermined such that it is higher than the maximum energy of the X-ray spectrum emitted by the X-ray emitter. | 03-25-2010 |
20100127182 | X-ray radiation detector for use in a CT system - At least one embodiment of the invention relates to an X-ray radiation detector, in particular for use in a CT system. In at least one embodiment, the X-ray radiation detector includes a semiconductor material used for detection, at least two ohmic contacts between the semiconductor material and a contact material, the semiconductor material and contact material each having a specific excitation energy of the charge carriers, with the excitation energy of the contact material corresponding to the excitation energy of the semiconductor material. At least one embodiment of the invention furthermore relates to a CT system in which an X-ray radiation detector is used, the X-ray radiation detector advantageously having at least two ideal ohmic contacts according to at least one embodiment of the invention. | 05-27-2010 |
20100246758 | X-RAY RADIATION DETECTOR FOR DETECTING IONIZING RADIATION, IN PARTICULAR FOR USE IN A CT SYSTEM - An X-ray radiation detector is disclosed for detecting ionizing radiation, in particular for use in a CT system, with a multiplicity of detector elements. In at least one embodiment, each detector element includes a semiconductor used as detector material with an upper side facing the radiation and a lower side facing away from the radiation, at least two electrodes, wherein one electrode is formed on the upper side of the semiconductor by a metallization layer, and the sum of all detector elements forms a base, which has a base normal at each point. In at least one embodiment, the invention is distinguished by the fact that the upper side of the semiconductor has a surface structure with a surface normal at each point, wherein the surface normal at least in part subtends an angle to the base normal. In at least one embodiment, the invention furthermore relates to a CT system provided with an X-ray radiation detector, which advantageously includes a multiplicity of detector elements structured according to at least one embodiment of the invention. | 09-30-2010 |
20110186788 | Radiation Converter Material, Radiation Converter, Radiation Detector, Use of a Radiation Converter Material and Method for Producing a Radiation Converter Material - A radiation converter material includes a semiconductor material used for directly converting radiation quanta into electrical charge carriers. In at least one embodiment, the semiconductor material includes a dopant in a dopant concentration and defect sites produced in a process-dictated manner in such a way that the semiconductor material includes an ohmic resistivity in a range of between 5·10 | 08-04-2011 |
20110284978 | RADIATION CONVERTER COMPRISING A DIRECTLY CONVERTING SEMICONDUCTOR LAYER AND METHOD FOR PRODUCING SUCH A RADIATION CONVERTER - A radiation converter includes a directly converting semiconductor layer, wherein the semiconductor layer includes grains whose interfaces at least predominantly run parallel to a drift direction—constrained by an electric field—of electrons liberated in the semiconductor layer. in at least one embodiment, the charge carriers liberated by incident radiation quanta are accelerated in the electric field in the direction of the radiation incidence direction and on account of the columnar or pillar-like texture of the semiconductor layer, in comparison with the known radiation detectors, cross significantly fewer interfaces of the grains that are occupied by defect sites. This increases the charge carrier lifetime/mobility product in the direction of charge carrier transport. Consequently, it is possible to realize significantly thicker semiconductor layers for the counting and/or energy-selective detection of radiation quanta. This increases the absorptivity of the radiation converter which in turn makes it possible to reduce a radiation dose applied to the patient. at least one embodiment of the invention additionally relates to a method for producing such a radiation converter. | 11-24-2011 |
20120193739 | Direct Radiation Converter, Radiation Detector, Medical Apparatus And Method For Producing A Direct Radiation Converter - A direct radiation converter is disclosed which includes a radiation detection material having an anode side and a cathode side in which the radiation detection material has a doping profile running in the anode-side to cathode-side direction. A radiation detector is further disclosed having such a direct radiation converter and having an anode array and a cathode array, and optionally having evaluation electronics for reading out a detector signal, as well as a medical apparatus having such a radiation detector. Also described is a method for producing a direct radiation converter which includes incorporating into a radiation detection material a doping profile running in the anode-side to cathode-side direction. | 08-02-2012 |
20120235052 | METHOD FOR DETECTING X-RAY RADIATION AND DETECTOR SYSTEM WITH DIRECT CONVERSION DETECTORS - A method and a detector system are disclosed for the photon-counting detection of x-ray radiation with direct conversion detectors. In at least one embodiment of the method, as a function of the existing radiation energy, current and/or voltage pulses which are largely proportional thereto are generated, and the generated current and voltage pulses are counted in the detector when a predetermined current and/or voltage source is exceeded, whereby a threshold is used as a predetermined current and/or voltage threshold, which corresponds to a detection of a photon with an energy which is less than the k-edge of the detector material used. | 09-20-2012 |
20120236986 | Circuit Arrangement For A Directly Converting Detector And Likewise The UseThereof And A Method For Reading A Directly Converting Detector - A circuit arrangement is disclosed for a detector. In at least one embodiment, the circuit arrangement includes a directly-converting semi-conductor material and pulse-shaper in the signal readout electronics assembly. A method is disclosed for a readout of count impulses generated in the semi-conductor material, wherein part of the pulse-shaper is equipped with a relatively longer shaping time constant and a different part of the pulse-shaper is equipped with a relatively shorter shaping time constant. | 09-20-2012 |
20120243660 | Method For Correcting Detector Data Of An X-Ray Detector And X-Ray Recording System - 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. | 09-27-2012 |
20130161773 | DETECTOR ELEMENT, RADIATION DETECTOR, MEDICAL DEVICE, AND METHOD FOR PRODUCING SUCH A DETECTOR ELEMENT - A detector element is disclosed, including a semiconducting converter element and a number of pixilated contacts arranged thereon. A radiation detector is also disclosed including such a detector element, along with a medical device having one or more such radiation detectors. Finally, a method for producing a detector element is disclosed, which includes forming pixelated contacts by way of a photolithographic process on the semiconducting converter element using a lithographic mask arranged on a converter element protective layer. | 06-27-2013 |