Patent application number | Description | Published |
20080205727 | Computed Tomography Method With Helical Relative Movement And Conical Beam Bundle - The invention relates to a computed tomography method in which a periodically moving object is irradiated by a conical beam bundle. An nPi-relative movement is generated between a radiation source, which generates the conical beam bundle, and the object. During the nPi-relative movement, measured values are acquired, which depend on the intensity in the beam bundle on the other side of the object and from these measured values filter values are determined, which are divided into different groups. The filter values of at least one group are weighted in dependence on the movement of the object, wherein, when filter values of several groups are weighted, filter values of different groups are weighted differently in dependence on the movement of the object. Finally, a CT image of the object is reconstructed from the filter values. | 08-28-2008 |
20080205729 | Method And Device For The Iterative Reconstruction Of Tomographic Ilmages - The invention relates to a device and a method for the iterative reconstruction of the attenuation coefficients μ | 08-28-2008 |
20080269617 | Absorption and Scattering Map Reconstruction For Optical Fluorescence Tomography - Optical fluorescence tomography is a highly sensitive method to image contrast agents in the body. However, current reconstruction methods suffer from a high complexity or even instability. According to an exemplary embodiment of the present invention, a method for absorption/scattering map reconstruction for optical fluorescence tomography may be provided, which uses a spectral model. This may provide for a subsequent fluorescence reconstruction with improved image quality. | 10-30-2008 |
20080317320 | Correction of Artifacts Caused by the Heel Effect - According to the present invention, a 3D look-up table and a method for generating the same is provided, taking into account the x-ray spectrum variations in dependence of the cone beam angle caused by the heel effect. The 3D look-up table includes monochromatic attenuation values for all corresponding polychromatic attenuation values for each x-ray spectrum, depending on the cone beam angle. Advantageously, less image artifacts, such as, for example, cupping artifacts, are achieved in the reconstructed images. | 12-25-2008 |
20090074129 | CT Method for the Examination of Cyclically Moving Object - The invention relates to a computer tomography method for the detection of a cyclically moved object in an examination zone. First, after the acquisition of the measured values, a rough image of the examination zone is reconstructed from which a region relevant for the further method is selected. For the generation of an image with reduced motion artifacts or improved temporal resolution, reconstruction windows in predefinable position are used, which are optimized in such a way that they are, on the one hand, smallest possible, on the other hand, however, sufficiently large, to be able to reconstruct all voxels of this region. Only measured values acquired within the reconstruction windows are taken into account for the reconstruction of a CT image of the region. | 03-19-2009 |
20090116717 | METHOD FOR RECONSTRUCTION IMAGES AND RECONSTRUCTION SYSTEM FOR RECONSTRUCTING IMAGES - A reconstruction method for an image of an object, the reconstruction method comprising receiving a first projection data set representing information about said object, receiving a second projection data set representing information about said object, reconstructing a first image of said object using the first projection data set, reconstructing a second image of said object using the second projection data set, performing a registration between the first image and the second image, and fusing the first image and the second image to said image of said object, wherein the first projecting data set and the second projecting data set are achieved by using a single radiation type. | 05-07-2009 |
20090185655 | COMPUTED TOMOGRAPHY METHOD - A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation ( | 07-23-2009 |
20090232372 | ADAPTIVE OVERLAPPING OF CARDIAC WEIGHTING VECTORS IN CARDIAC CT | 09-17-2009 |
20090232379 | RECONSTRUCTION OF AN IMAGE OF A MOVING OBJECT FROM VOLUMETRIC DATA - In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the object is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image quality may be provided. | 09-17-2009 |
20090238326 | ELECTRON COMPUTER TOMOGRAPHY METHOD AND ELECTRON COMPUTER TOMOGRAPH - There is provided an electron computer tomography method for recording a moving object ( | 09-24-2009 |
20090238328 | X-RAY TUBE WITH OSCILLATING ANODE - It is described an X-ray tube ( | 09-24-2009 |