Patent application number | Description | Published |
20100232673 | REDUCTION OF ARTIFACTS CAUSED BY MOVEMENT OF AN X-RAY TUBE IN OBJECT RECONSTRUCTION - An improvement in image quality when determining an image using iterative reconstruction is provided by taking account of focus shifts. In order to take into consideration the influence of focus shift in calculated projections, several different projections are calculated for each section of the focus path on a section-by-section basis. The several different calculated projections for a section are averaged for comparison with a projection recorded in the section. Improved image quality is provided, for example, in tomosynthesis applications in which a large number of recordings are made with a stationary detector. | 09-16-2010 |
20100286928 | METHOD AND DEVICE FOR DETERMINING IMAGES FROM X-RAY PROJECTIONS - A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction. | 11-11-2010 |
20110058651 | DEVICE AND METHOD FOR X-RAY EXAMINATION OF AN OBJECT FOR MATERIAL DEFECTS BY MEANS OF X-RAYS - In a device and a method for testing an object for material defects, a multi-emitter x-ray source, at least one x-ray detector and a control system to activate emitters of the multi-emitter x-ray source are thereby used. A selective activation of individual emitters or of a portion of the emitters is conducted according to the requirements of at least one item of information related to the tested object. The Flexible and low-cost materials testing is achieved. | 03-10-2011 |
20120045105 | METHOD AND DEVICE TO PROVIDE QUALITY INFORMATION FOR AN X-RAY IMAGING PROCEDURE - In a method and device spatially resolved quality information is provided for an x-ray imaging procedure in which a data field representing the examination subject is reconstructed from a number of exposures of an examination subject. Quality information that indicates the reliability of the reconstructed data field for the corresponding element is determined for a number of elements of the data field. | 02-23-2012 |
20120136243 | METHOD FOR CALCULATING PERFUSION DATA - A method for calculating perfusion data, such as blood volume or blood flow from 2-D angiography data or DSA sequences, is proposed. An angiography scene is recorded using specific acquisition parameters to generate the 2-D angiography data or DSA sequences with administration of contrast agent based on a multiplicity of individual angiography images. A region of interest is defined suitable for comparison purposes. The volume segments are defined by the region of interest. The time/contrast curve is determined in the volume segments. Perfusion data for calculating the relative perfusion data is ascertained. The perfusion data is compared and the relative perfusion data is calculated. The calculated relative perfusion data is not specified in terms of absolute physical quantities, but is provided simply as ratios, such as left/right or before/after. | 05-31-2012 |
20120201352 | METHOD FOR OBTAINING A 3D IMAGE DATASET OF AN OBJECT OF INTEREST - A method for obtaining a 3D image dataset of an object of interest is proposed. A plurality of 2D X-ray images are captured and a 3D reconstruction is carried out using filtered back projection. The projection parameters have been measured with the aid of a calibrating phantom, possibly using an interpolation or extrapolation of such measurements. A model of effect strings of the components in an X-ray imaging device is obtained, and the model parameters are identified based on imaging of a calibrating phantom. A projection matrix can then be calculated for any positions on any desired trajectories, without having to use imaging of a calibrating phantom at precisely that position and desired trajectory. | 08-09-2012 |
20130077839 | Temporal Difference Encoding for Angiographic Image Sequences | 03-28-2013 |
Patent application number | Description | Published |
20080212101 | Optical Sensor for Detecting Moisture on a Windshield of a Motor Vehicle - In an optical sensor for detecting moisture on a windshield of a motor vehicle, in which the light radiation is deflectable to a detection area on the windshield situated in the light path between transmitter and receiver, the transmitter and/or the receiver have a transparent design and are integrated into the windshield. The transparent optical elements may thus be situated in the area of a wiped field of the windshield cleaned by the windshield wiper. | 09-04-2008 |
20080212151 | Rain Sensor, for a Motor Vehicle in Particular, and Method for Producing the Rain Sensor - The invention relates to a rain sensor, especially for a motor vehicle, said sensor comprising an optical waveguide ( | 09-04-2008 |
20090161109 | OPTICAL SENSOR FOR DETECTING MOISTURE ON A WINDOW OF A MOTOR VEHICLE - In order also to allow the detection, for example, of condensation of the inner side of an interface (window) using motor-vehicle rain sensors that exploit the interference, at a window wetted with moisture, with total reflection of light irradiated by a transmitter, several sensors are proposed that are sufficiently variable in terms of configuration and function that they contain, without complex adaptation actions, an implementable possibility for selectable inside/outside detection simultaneously with good discrimination between outside and inside wetting. | 06-25-2009 |