Patent application number | Description | Published |
20100270473 | METHOD AND CIRCUIT ARRANGEMENT FOR DETERMINING AN INTENSITY OF IONIZING RADIATION - A method is disclosed for determining the intensity of ionizing radiation using a detector with a multiplicity of direct-conversion detector elements, in particular for use in a CT system. In at least one embodiment, the method includes supplying the signal pulses to a preamplifier/signal conditioner, supplying the amplified and conditioned signal pulses to two pulse-height discriminators connected in parallel or in series, registering by a combination logic, and transmitting the registered signal pulses to a counter. In at least one embodiment, provision is made for feedback, by which, firstly, the pulse shape of the signal pulses and, secondly, the clock rate of the clocked pulse-height discriminator are set as a function of the signal frequency. Furthermore, at least one embodiment of the invention relates to a circuit arrangement for measuring signals of a direct-conversion detector, in particular for use in a CT system, by which the method according to at least one embodiment of the invention can be carried out. | 10-28-2010 |
20110019801 | METHOD FOR PRODUCING A 2D COLLIMATOR ELEMENT FOR A RADIATION DETECTOR AND 2D COLLIMATOR ELEMENT - A method is disclosed for producing a 2D collimator element for a radiation detector, in which crossing webs made of a radiation-absorbing material are formed, layer-by-layer, by way of a rapid manufacturing technique. In at least one embodiment, the webs are aligned along a φ- and a z-direction and form a cell-shaped structure with laterally enclosed radiation channels, at least in the inner region of the 2D collimator element. In at least one embodiment, the invention moreover relates to a 2D collimator element for a radiation detector that has such a layered construction. This allows the provision of a very precise and rigid collimator arrangement which, at the same time, has a high collimation effect. | 01-27-2011 |
20120158811 | Method For Transforming Input Data And Medical Device - A method is disclosed for transmitting measurement data from a transmitter system to a receiver system by way of a transmission link of a medical device. In an embodiment, the measurement data, as input data of a transformation method, is transformed to output values and, after transmission, back transformed again, the values of the input data lying between a maximum value and a minimum value and an assignment function being used for compression purposes, to allocate an output value to every value of the input data, a root function being used as the assignment function for at least some of the values. | 06-21-2012 |
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 |
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 |
20120300896 | METHOD AND COMPUTED TOMOGRAPHY SYSTEM FOR GENERATING TOMOGRAPHIC IMAGE DATASETS - A method and a computed tomography system are disclosed for generating tomographic image datasets of a measurement object with multiple simultaneously operable sets of detector elements. In at least one embodiment, at least one first set measures incident radiation over the entire energy spectrum of the incident radiation in an integrating manner and at least one second set measures incident radiation in at least two energy ranges in a resolving manner, wherein furthermore by way of the integrating measurements, the energy-resolving measurements relating in each case to rays traversing a measurement object in a spatially identical manner are corrected and a tomographic image dataset of the measurement object is reconstructed at least from the corrected energy-resolving measurements. | 11-29-2012 |
20120300897 | COMPUTED TOMOGRAPHY SYSTEM WITH INTEGRATING AND COUNTING DETECTOR ELEMENTS - A computed tomography system includes at least two simultaneously operatable sets of detector elements, with at least one first set of integrating detector elements being designed for integrating radiation measurement and at least one second set of counting detector elements being designed to disperse an incident radiation spectrum into at least two energy bins; and includes a computer system for controlling the CT system and at least once capturing the measurement data of the detector elements with a memory and computer programs contained therein. The computer system is provided with programming so that a first mode is provided for operating only the at least one first set of integrating detector elements and a second mode is provided for the additional or sole operation of the at least one second set of counting detector elements. | 11-29-2012 |
20120301001 | METHOD AND COMPUTED TOMOGRAPHY SYSTEM FOR GENERATING TOMOGRAPHIC IMAGE DATASETS - A method and a dual-source CT are disclosed. In at least one embodiment, the projection data of the integrating and of the counting detector from a quarter rotation of the gantry is used jointly for reconstruction of a first tomographic image dataset, the energy-resolved projection data of the counting detector from at least one half rotation of the gantry being used for reconstruction of at least a second material-selective tomographic image dataset, and at least one tomographic result image dataset being formed by overlaying the first tomographic image dataset with the material selection of the second image dataset. | 11-29-2012 |
20120301002 | METHOD AND COMPUTED TOMOGRAPHY SYSTEM FOR GENERATING TOMOGRAPHIC IMAGE DATASETS - A method and a computed tomography system are disclosed for generating tomographic image datasets of a measurement object. The computed tomography system includes at least two simultaneously operable sets of detector elements which jointly scan a measurement object from a multiplicity of projection angles in an integrating manner on the one hand and an energy-resolving manner on the other hand. In at least one embodiment, the method includes determining a first projection dataset from measurement data recorded in an integrating manner. Further, at least one second projection dataset is determined from energy-resolved measurement data, and in addition a weighted tomographic result image dataset is calculated based on weighted use of the first and the second projection dataset, the weighting being applied to the projection data or the tomographic image data reconstructed therefrom. | 11-29-2012 |
20120326049 | QUANTUM-COUNTING RADIATION DETECTOR - A quantum-counting radiation detector is disclosed, in particular an x-ray detector. In at least one embodiment, the signals of the individual pixels and the signals of combined pixels are evaluated in parallel processing branches. It is then possible to combine the count results in an appropriate manner, to reduce the influence of unwanted interference effects for the respective application. | 12-27-2012 |
20130134313 | DETECTOR ARRANGEMENT OF AN IMAGING SYSTEM DETECTOR DETECTING IONIZING RADIATION WITH AIR COOLING AND METHOD FOR COOLING THE DETECTOR ARRANGEMENT - A detector arrangement of an imaging system detector detecting ionizing radiation includes a detector carrier, a plurality of detector modules attached to the detector carrier, and a collimator disposed in the radiation direction in front of the detector modules which are disposed on the incident radiation measurement side. In at least one embodiment, at least one air gap is included for conveying cooling air is disposed between the collimator and the measurement sensors of the detector modules. A method is also disclosed for cooling a detector arrangement of a detector rotating around a system axis with a plurality of measurement sensors disposed next to one another and a collimator arranged in the radiation direction in front of the measurement sensors, wherein cooling air is conveyed in or against the system axis direction between the collimator and the measurement sensors which directly cools the surface of the measurement sensors. | 05-30-2013 |
20130214144 | METHOD FOR HOMOGENIZATION OF THE THRESHOLD VALUES OF A MULTI-CHANNEL, QUANTA-COUNTING RADIATION DETECTOR - A method is disclosed for homogenization of threshold values of a multichannel, quanta-counting radiation detector. In an embodiment of the method empty measurements are carried out with the detector at different spectral compositions of the radiation with different settings of threshold values of the comparators. For each channel of which the comparators is to be set to the same energy threshold, an adapted threshold value is determined for this energy threshold from the empty measurement, at which a variation of the normalized count rate of the channel is minimized over the different spectral compositions of the radiation. This avoids problems in the further processing of the measurement data of the detector, which can occur during alterations of the spectrum. | 08-22-2013 |
20130251111 | METHOD FOR ENERGY CALIBRATING QUANTUM-COUNTING X-RAY DETECTORS IN A DUAL-SOURCE COMPUTED-TOMOGRAPHY SCANNER - A method is disclosed for energy calibrating quantum-counting x-ray detectors in an x-ray installation including at least two x-ray systems turnable around a center of rotation. A target, for producing x-ray fluorescence radiation, is positioned between the first x-ray source and first x-ray detector and irradiated with x-radiation of the first x-ray source in such a way that x-ray fluorescence radiation which strikes the second x-ray detector from the target is produced by the x-radiation of the first x-ray source. The second x-ray detector is then energy calibrated by way of the x-ray fluorescence radiation of the target. The first x-ray detector can be energy calibrated in the same way with the aid of the x-radiation of the second x-ray source. With the proposed method, the x-ray detectors of a dual-source CT x-ray installation can be calibrated with little expenditure under conditions close to those of the system. | 09-26-2013 |