Patent application number | Description | Published |
20080205585 | Energy-Resolved Photon Counting For Ct - Spectral CT systems require cheap detectors with high energy resolution. According to an aspect of the present invention, a computer tomography apparatus comprises a detector element which is segmented into a plurality of sub-pixels. Each sub-pixel has at least two thresholds and counting channels, wherein the second threshold for each sub-pixel varies over the nominal detector element. This may provide for an improved energy-resolved photon counting. | 08-28-2008 |
20080205722 | Method and Apparatus for Automatic 4D Coronary Modeling and Motion Vector Field Estimation - A method for computer-aided four-dimensional (4D) modeling of an anatomical object comprises acquiring a set of three-dimensional (3D) models representing a plurality of static states of the object throughout a cycle. A 4D correspondency estimation is performed on the set of 3D models to determine which points of the 3D models most likely correspond to each other, wherein the 4D correspondency estimation includes one or more of (i) defining a reference phase, (ii) performing vessel-oriented correspondency estimation, and (iii) post-processing of 4D motion data. The method further comprises automatic 3D modeling with a front propagation algorithm. | 08-28-2008 |
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 |
20080218510 | 3D-2D Adaptive Shape Model Supported Motion Compensated Recnstruction - A method for generating or reconstruction of three-dimensional (3D) images corresponding to a structure of interest ( | 09-11-2008 |
20080253502 | Method and Device for the Iterative Reconstruction of Cardiac Images - The invention relates to a method and a device for the iterative reconstruction of cross-sectional images of the heart ( | 10-16-2008 |
20080267342 | Efficient Iterative Four-Dimensional Cardiac Cone-Beam Ct Reconstruction - The increasing cone angle of current high-end and future CT systems leads to a decrease in image quality if approximate cone-beam reconstruction methods are used. According to an exemplary embodiment of the present invention, an iterative four-dimensional cardiac CT reconstruction is provided, in which phase volumes are selected from the four-dimensional data set, each having the same spatial volume at different phase points. Corresponding voxels inside these phase volumes are then forward projected onto the same projection. After calculation of a different projection, these voxels are updated. This may provide for an efficient implementation of an iterative four-dimensional cardiac cone-beam CT reconstruction. | 10-30-2008 |
20080267344 | Signal Processing Unit for Producing Images - An exemplary embodiment of the invention provides a signal processing unit for producing images of an object under examination based on data signals of a tomography system, the signal processing unit comprising a processor and an input interface, wherein the input interface is adapted to receive measured data signals. Furthermore, the processor is adapted to generate a pulmonary gating signal based on said measured data signals and is further adapted to generate an image based on said measured data signals by using the pulmonary gating signal. | 10-30-2008 |
20080267455 | Method for Movement Compensation of Image Data - According to an exemplary embodiment a method for movement compensation of image data of an object of interest comprises receiving projection data, receiving motion vector field data, and dividing the motion vector field data into a number of layers of motion vector field data. Furthermore, the method comprises generating motion compensated projection data by projecting at least one of the number of layered motion vector field data onto the projection data and applying a two dimensional motion compensation on the projection, and generating image data of at least one voxel by back-projecting the movement compensated projection data. | 10-30-2008 |
20080267480 | Iterative Image Reconstruction of a Moving Object From Projection Data - Iterative methods for reconstructing an image sequence of a moving object based on projection data usually require a high computationally effort. According to embodiments of the present invention there is provided such a method wherein a first image representing the object at a first phase is used as an initial image for iteratively reconstructing a second image at a second phase. A first gating function is assigned to the first phase, a second gating function is assigned to the second phase. When executing a first iteration for reconstructing the second image only projection data corresponding to a non-overlapping part of the two gating functions are used. For executing further iterations the amount of projection data corresponding to the overlapping part of the two gating functions may be gradually increased. Therefore, for all further but the last iteration the computationally effort is significantly reduced. However, this low computationally expense has no negative impact on the quality of the finally reconstructed second image because the method benefits from the fact that the first image was used as the initial image for iteratively reconstructing the second image. | 10-30-2008 |
20080273656 | Advanced Convergence for Multiple Iterative Algorithm - Iterative methods for reconstructing of three-dimensional images based on projection data signals obtained by a computer tomography system often result in wrong absorption coefficients in particular for regions including a hollow space of an object under examination. Furthermore iterative methods show a slow convergence for calculating such absorption coefficients. According to embodiments of the present invention there is provided a method for an advanced reconstruction of three-dimensional images based on modified projection data signals. The modification includes an addition of a constant absorption value to the measured projection data. Advantageously the constant absorption value is an absorption line integral through a virtual body having the spatial constant absorption coefficient of water. The virtual body preferably has a volume which is slightly bigger than the object of interest. | 11-06-2008 |
20080292157 | Automatic Adaptive Soft Tissue Thresholding for Two-Pass Ct Cone-Beam Artifact Reduction - Since the soft tissue levels in an image usually comprise a variety of values between air and bone boundaries, it may not be obvious a priori what threshold value applies. According to an exemplary embodiment of the present invention, an examination apparatus is provided which is adapted for determining the optimal weight for subtraction of a soft tissue correction image without performing a multitude of forward and backward projections. This may be provided determining a roughness function based on a plurality of subtractions of the soft tissue streak image, each subtraction corresponding to a different weighting of the streak image. | 11-27-2008 |
20080317311 | Coherent Scatter Imaging - A region of interest is identified using a conventional CT or X-ray approach. Then, the region of interest is scanned using a plurality of pencil beams ( | 12-25-2008 |
20090003513 | Reconstruction Unit for Reconstructing a Fine Reproduction of at Least a Part of an Object - A reconstruction unit is provided for receiving a sequence of data sets, the data sets representing structural information of the object. The reconstruction unit performs receiving scheduling information related to the data sets of the sequence of data sets. Then reconstructing a sequence of coarse reconstructions of the object by using the sequence of data sets and the scheduling information. Afterwards a sequence of adapted models of the object is generated by adapting a respective model to each of the coarse reconstructions. Then a motion of a predetermined portion of each of the adapted models is determined and a specific data set of the sequence of data sets is selected, wherein the specific data set corresponds to the adapted model with the minimum motion of the predetermined portion. Finally the reconstruction unit performs reconstructing a fine reconstruction of at least the part of the object using the specific data set. | 01-01-2009 |
20090060124 | ENERGY RESOLVED COMPUTER TOMOGRAPHY - Interpolation of the momentum transfer prior to the filtered backprojection reconstruction in computer tomography baggage inspection or medical applications may not result in best image quality or minimal computational cost. According to an exemplary embodiment of the invention, a non-linear energy binning of an energy-resolved single-row detector is provided, which automatically leads to a Cartesian q-sampling on a parallel rebinned detector. This may avoid the q interpolation prior to the filtered back projection reconstruction, resulting in improved spatial resolution, reduction of computational effort and improved image quality. | 03-05-2009 |
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 |
20090074133 | Reconstruction Method for Computer Tomograph and Computer Tomograph - It is an object of the invention to provide spiral computer tomography which has a high image quality. It relates to a reconstruction method for computer tomography of the heart, wherein the image is reconstructed from a data component of recordings of a partial detector path of a detector device and from a data component of recordings of a full detector path of the detector device, and to a computer tomograph having a beam source, a drive arrangement for driving the beam source in a spiral path around an object, a detector device for recording the radiation from the beam source which passes at least partially through the object, and a control device for reconstructing data components of a partial detector path and a full detector path. | 03-19-2009 |
20090141935 | MOTION COMPENSATED CT RECONSTRUCTION OF HIGH CONTRAST OBJECTS - Cardiac CT imaging using gated reconstruction is currently limited in its temporal and spatial resolution. According to an exemplary embodiment of the present invention, an examination apparatus is provided in which an identification of a high contrast object is performed. This high contrast object is then followed through the phases, resulting in a motion vector field of the high contrast object, on the basis of which a motion compensated reconstruction is then performed. | 06-04-2009 |
20090161815 | DUAL SPECTRUM X-RAY TUBE WITH SWITCHED FOCAL SPOTS AND FILTER - In three-dimensional computed tomography or three-dimensional rotational X-ray imaging, the acquisition of different spectral measurement data requires subsequent acquisition runs. According to an exemplary embodiment of the present invention, an examination apparatus is provided in which different spectral measurement data are acquired immediately one after another during the same acquisition run by performing a focal spot switching during data acquisition. This may reduce motion artefacts. | 06-25-2009 |
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 |
20090208077 | IMAGING SYSTEM - The present invention relates to an imaging system for imaging a field of interest, in particular to a computed tomography system. The imaging system comprises an irradiation unit ( | 08-20-2009 |
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 |
20090238412 | LOCAL MOTION COMPENSATED RECONSTRUCTION OF STENOSIS - The analysis of a stenosis of a coronary vessel in three dimensions requires a motion compensated reconstruction. According to an exemplary embodiment of the present invention, an examination apparatus for local motion compensated reconstruction data set is provided, wherein the local motion compensated reconstruction vectors relating to a start point and an end point of the stenosis. | 09-24-2009 |
20090274265 | CONTINUOUS COMPUTER TOMOGRAPHY PERFORMING SUPER-SHORT-SCANS AND STRONGER WEIGHTING OF MOST RECENT DATA - A computer tomography apparatus and method, a computer-readable medium and a program element are provided for examining a region of interest (ROI) of an object or patient in real-time. When only a region of interest is to be reconstructed, it is sufficient to rotate the radiation source and detector elements such that they cover a circular arc whose extension is less than π+α, α being the beam angle of the radiation source. This scanning range is called super-short-scan. Super-short-scans produce less data. Consequently image reconstruction is quicker which is very preferable for real-time CT. The CT data can furthermore be weighted in a manner that data detected at the end of a super-short-scan are weighted stronger than data detected at the beginning of a super-short-scan. | 11-05-2009 |
20090310737 | METHOD FOR COMPUTER TOMOGRAPHY, AND COMPUTER TOMOGRAPH - According to the invention, there is provided a method of recording images of the heart in computer tomography, in which, in order to prevent movement artifacts, the images are reconstructed on the basis of similar movement states of the heart and different radiation intensities are used for different movement states. Also provided is a computer tomograph for recording images of the heart in computer tomography by means of time windows which exhibit similar movement states of the heart in order to prevent movement artifacts, said computer tomograph comprising a control device which controls a radiation source with different radiation intensities for different movement states. Furthermore provided is a computer program for a computer tomograph for recording images of the heart in computer tomography by means of time windows which exhibit similar movement states of the heart in order to prevent movement artifacts, and for controlling a radiation source with different radiation intensities for different movement states. | 12-17-2009 |
20100014726 | HIERARCHICAL MOTION ESTIMATION - In three-dimensional rotational x-ray coronary imaging problems may arise when estimating the motion of small vessels. According to an exemplary embodiment of the present invention, an examination apparatus is provided which is adapted for performing a hierarchical motion estimation by global affine transformation for every heart phase, followed by vessel branch selective affine and non-affine transformations. This may provide for an improved image quality. | 01-21-2010 |
20100098315 | ITERATIVE RECONSTRUCTION OF CORONARY ARTERIES - According to an exemplary embodiment of the present invention, an iterative reconstruction of coronary arteries comprises a filtering of projection data on the basis of a top-hat filter and an iterative reconstruction of the object of interest on the basis of a regularisation favouring sparse objects. This may provide for high contrast and detail. | 04-22-2010 |
20100201786 | METHOD AND APPARATUS FOR RECONSTRUCTING AN IMAGE - A reconstruction method for an image of an object under examination is provided, wherein the method comprises, receiving a first projection data set representing three-dimensional information about said object under examination and reconstructing at least one three-dimensional image out of the first projection data set. Further, a second projection data set representing two-dimensional information about the object under examination is received, wherein the second data set was recorded under a first direction and wherein a two-dimensional image out of the second projection data set is generated. Furthermore, a volume rendered projection is reconstructed out of the at least one three-dimensional image using the first direction as the reconstruction direction of the volume rendered projection and the two-dimensional image and the volume rendered projection are overlaid. | 08-12-2010 |
20100266182 | APPARATUS FOR DETERMINING A PARAMETER OF A MOVING OBJECT - The present invention relates to an apparatus for determining a parameter of a moving object, wherein the apparatus comprises an adaptive model providing unit ( | 10-21-2010 |
20100295846 | FOUR-DIMENSIONAL RECONSTRUCTION OF REGIONS EXHIBITING MULTIPLE PHASES OF PERIODIC MOTION - A method for four dimensional reconstruction of regions exhibiting multiple phases of periodic motion includes the operation of building one or more 3-D reconstructions using a set of 2-D projections. The method further includes the operation of deriving one or more 3-D model segments from each of the one or more 3-D reconstructions, wherein a plurality of 3-D model segments are formed thereby, and wherein each of the one or more 3-D model segments is derived from a single one of the one or more 3-D model segments. The plurality of derived 3-D model segments forms a 4-D reconstruction of the region of interest. | 11-25-2010 |
20100316270 | 3D RECONSTRUCTION OF A BODY AND OF A BODY CONTOUR - The invention proposes a 3D reconstruction of a body and a body contour from transversally truncated projections using a polyhedral object model. Possible clinical applications arise in the field of guided biopsies on acquisition systems equipped with a flat panel detector, where truncated projections cannot be avoided in thorax and abdominal scan protocols. From, for example, a rotational run both a 3D volume reconstruction and a surface mesh reconstruction of a patient's shape is generated and then visualized simultaneously in order to help the physician guide the biopsy device and judge the distance from the patient's skin to the tissue of interest inside the reconstructed volume. | 12-16-2010 |
20110002444 | MODEL BASED SELF-POSITIONING PATIENT TABLE FOR X-RAY SYSTEMS | 01-06-2011 |
20110058723 | APPARATUS FOR GENERATING AN IMAGE OF MOVING OBJECT - The present invention relates to an apparatus for generating an image of a moving object, wherein a movement of the object comprises a multiple of moving phases. The apparatus comprises a measured detection data providing unit ( | 03-10-2011 |
20110182492 | ANGIOGRAPHIC IMAGE ACQUISITION SYSTEM AND METHOD WITH AUTOMATIC SHUTTER ADAPTATION FOR YIELDING A REDUCED FIELD OF VIEW COVERING A SEGMENTED TARGET STRUCTURE OR LESION FOR DECREASING X-RADIATION DOSE IN MINIMALLY INVASIVE X-RAY-GUIDED INTERVENTIONS - The present invention refers to an angiographic image acquisition system and method which can beneficially be used in the scope of minimally invasive image-guided interventions. In particular, the present invention relates to a system and method for graphically visualizing a pre-interventionally virtual 3D representation of a patient's coronary artery tree's vessel segments in a region of interest of a patient's cardiovascular system to be three-dimensionally reconstructed. Optionally, this 3D representation can then be fused with an intraoperatively acquired fluoroscopic 2D live image of an interventional tool. According to the present invention, said method comprises the steps of subjecting the image data set of the 3D representation associated with the precalculated optimal viewing angle to a 3D segmentation algorithm (S | 07-28-2011 |
20120057671 | DATA ACQUISITION AND VISUALIZATION MODE FOR LOW DOSE INTERVENTION GUIDANCE IN COMPUTED TOMOGRAPHY - A system and method for monitoring a guided intervention device includes determining ( | 03-08-2012 |
20120114213 | MULTI-MODALITY BREAST IMAGING - A system for multi-modality breast imaging comprises a first shape model constructing sub-system ( | 05-10-2012 |
20120207373 | THREE-DIMENSIONAL ANALYSIS OF LESIONS REPRESENTED BY IMAGE DATA - A system for three-dimensional analysis of lesions in image data is disclosed. It comprises a lesion detection subsystem ( | 08-16-2012 |
20120280980 | SPATIAL AND SHAPE CHARACTERIZATION OF AN IMPLANTED DEVICE WITHIN AN OBJECT - It is described a method for spatially characterizing a device positioned within an object, e.g. a patient's body, under examination that e.g. allows a clinician to easily assess the deployment state and position of the device. The method comprises the steps of acquiring ( | 11-08-2012 |
20120301003 | RECONSTRUCTING AN OBJECT OF INTEREST - A system for generating a reconstruction of an object of interest comprises a shape model generator ( | 11-29-2012 |
20120302876 | OBJECT LOCALIZATION APPARATUS - The invention relates to an object localization apparatus for localizing an object having markers based on a projection image. An object function ( | 11-29-2012 |
20130039559 | IMAGE DATA REGISTRATION FOR DYNAMIC PERFUSION CT - A method of registering a 4D contrast enhanced image data set, wherein the 4D contrast enhanced image data set includes image data of the same volume of interest acquired at different timeframes with changing contrast enhancement, the volume of interest includes moving structure, and the different timeframes correspond to a predetermined motion phase of interest in different motion cycles of the moving structure, the method, comprising: registering image data corresponding to a plurality of the different timeframes with reference image from one of the timeframes. | 02-14-2013 |
20130261439 | INTERVENTIONAL APPARATUS ACTIVATED COMPUTED TOMOGRAPHY (CT) | 10-03-2013 |
20130279783 | COMPUTED TOMOGRAPHY SYSTEM AND METHOD FOR TRACKING A BOLUS - The present invention relates to a computed tomography system ( | 10-24-2013 |
20140015836 | SYSTEM AND METHOD FOR GENERATING AND DISPLAYING A 2D PROJECTION FROM A 3D OR 4D DATASET - A system and method is described by which so-called standard angiographic views can be generated using a 3-or 4-D reconstructed image of the object of interest. One preferred example is the reconstruction of coronary angiograms from rotational angiography sequences. Once the 3D image is created, it can be forward projected into the user-defined “standard” views for live presentation during the procedure. It is anticipated that these standard views, which more closely mimic what a physician is accustomed to see, will be more readily accepted by the interventional community. | 01-16-2014 |
20140037046 | DYNAMIC PERFUSION IMAGING - A method includes scanning a region of interest, during a contrast agent based perfusion scan, at a predetermined temporal sampling rate during contrast agent uptake in the region of interest, and generating time frame data indicative of the scanned region of interest. The method further includes identifying a predetermined change in an amount of the contrast agent in the region of interest from the time frame data. The method further includes scanning the region of interest at a lower temporal sampling rate, which is lower than the temporal sampling rate during the contrast agent uptake, in response to identifying the predetermined change in the amount of the contrast agent in the region of interest. | 02-06-2014 |
20140270450 | MOTION COMPENSATED SECOND PASS METAL ARTIFACT CORRECTION FOR CT SLICE IMAGES - An apparatus and a method for correcting a CT slice image for an image artifact ( | 09-18-2014 |
20140321612 | C-ARM SYSTEM WITH EXTENDED FIELD OF VIEW - The present invention relates to a C-arm X-ray imaging system. In order to provide C-arm systems with an extended three-dimensional field of view, a C-arm X-ray imaging system ( | 10-30-2014 |
20140357988 | FLEXIBLE X-RAY, DETECTOR WITH OPTICAL SHAPE SENSING - The present invention relates to a sensor device for detecting dose of radiation received at the sensor device, the sensor device comprising a flexible body having a cross-section being comparatively small relative to the length of the device, a cladding at the flexible body, the cladding converting incoming radiation into visible light, and an optical shape sensing device disposed within the flexible body and configured to determine a shape of the flexible instrument relative to a reference, the shape sensing device configured to collect information based on its configuration to map an intraluminal structure during a procedure. The present invention further relates to a radiation therapy system including such a sensor device and a method of operating a radiation therapy system including such a sensor device. | 12-04-2014 |
20150018596 | SYSTEM FOR PLANNING RADIATION TREATMENT THERAPY - A system for planning radiation treatment therapy is provided. An optical sensor device is implanted within or in close proximity to a risk region within the patient during a radiation delivery. The sensor device optically monitors the orientation of the risk region, and the radiation dosage received by the risk region, during the radiation delivery. That information may be used as appropriate to modify an on-going radiation delivery plan in real time while the plan is being implemented. | 01-15-2015 |
20150023471 | STEREO X-RAY TUBE BASED SUPPRESSION OF OUTSIDE BODY HIGH CONTRAST OBJECTS - A double focal spot X-ray tube ( | 01-22-2015 |