Patent application number | Description | Published |
20080317213 | X-RAY ABSORPTION GRID - An x-ray absorption grid produced by a lithography method for use in a phase-contrast CT system has at least two individual grids arranged atop one another in the radiation direction. Each individual grid has a grid area with a grid structure including grid webs and grid gaps in alternation. Each individual grid has a region outside of the grid area (outer region). The outer region of the at least two individual grids has toothed structures corresponding to one another at least two points. The toothed structures are generated as well in the production of the grid structure. The toothed structures have a position that is defined relative to the grid structure, such that a defined alignment of the individual grids occurs given a combination of the individual grids by engagement of the toothed structures of individual grids lying atop one another. | 12-25-2008 |
20090003526 | Measurement system and method for the noninvasive determination of properties of an object to be examined and contrast medium for X-ray phase-contrast measurement - A method and a measurement system are disclosed for the noninvasive determination of properties of an object to be examined and to the use of a contrast medium for X-ray phase-contrast measurement. in at least one embodiment of the invention, a mixture (suspension) consisting of a base liquid and a multiplicity of particles contained therein is used, the refractive index of the base liquid being different to the refractive index of the particles. | 01-01-2009 |
20090052611 | Method and x-ray computed tomography system for visualizing at least two types of cardiac tissue: Healthy tissue and diseased tissue - A method and an x-ray computed tomography system are disclosed for visualizing at least two different types of cardiac tissue, such as normally perfused tissue, hypoperfused tissue and scarred tissue. In at least one embodiment, this is done by use of an imaging tomographic recording technique with the aid of x-ray radiation, wherein at least one cardiac region of a patient is scanned by x-ray radiation which passes through a first grating for the passing-through x-ray radiation, designed as an absorption grating, prior to reaching the patient, and at least the locally caused phase-shifts of the x-ray radiation in the cardiac region are also made detectable by using a second grating for the passing-through x-ray radiation, designed as a phase grating, downstream of the patient in the emission direction, and the spatial distribution of these shifts is measured and reconstructed, wherein an average specific phase-shift value is assigned to each spatial unit, wherein each of the abovementioned tissue types are assigned to a region of a typical specific phase-shift value and at least one region assigned to a tissue type is optically highlighted in a view of the cardiac region. | 02-26-2009 |
20090052614 | Method for marking and visualizing an implant by way of an x-ray phase-contrast tomography examination and an implant - A method is disclosed for marking and visualizing an implant by use of an x-ray phase-contrast tomography examination. Further, an implant is also disclosed. In at least one embodiment, implants are used with specific characteristics which are as unambiguous as possible with regard to the phase shift generated by the implants in a phase-contrast tomography examination. In at least one embodiment, these specific characteristics can include the typical self-generated specific phase shift, typical differences in the specific phase-shift values, or typical spatial structures of materials with well-defined phase-shift values. | 02-26-2009 |
20090074139 | Method and an apparatus for detecting and localizing a metabolic marker - A method and an x-ray system are disclosed for detecting and localizing a metabolic marker. In at least one embodiment, the method includes creating at least one absorption x-ray view of a patient or of a first region of a patient; creating at least one phase-contrast x-ray view of the patient or of a second region of the patient, with a quasi-coherent x-ray radiation being generated for the phase-contrast measurement with the aid of an x-ray grating arranged between the x-ray source and the patient, and the spatially dependent phase shift of the x-ray radiation in the patient being made visible with the aid of at least one grating between the patient and a detector; superposing the at least one absorption x-ray view and the at least one phase-contrast x-ray view; wherein orientation based on anatomical features is carried out with the aid of the at least one absorption x-ray view, and a spatial distribution of the metabolic marker present in the body of the patient is determined by the at least one phase-contrast x-ray view. | 03-19-2009 |
20090154640 | FOCUS DETECTOR ARRANGEMENT AND METHOD FOR GENERATING CONTRAST X-RAY IMAGES - In a focus detector arrangement and method for an x-ray apparatus for generating projection or tomographic phase-contrast images of an examination subject, a beam of coherent x-rays is generated by an anode that has areas of different radiation emission characteristics arranged in bands thereon, that proceed parallel to grid lines of a phase grid that is used to generate the phase-contrast images. | 06-18-2009 |
20100177864 | ARRANGEMENT AND METHOD FOR PROJECTIVE AND/OR TOMOGRAPHIC PHASE-CONTRAST IMAGING USING X-RAY RADIATION - An arrangement and a method are disclosed for projective and/or tomographic phase-contrast imaging using X-ray radiation. In at least one embodiment, one or more phase grids is/are arranged in the beam path such that during a rotation of the at least one X-ray source, the examination object is scanned with different spatial orientations of the grid lines relative to the examination object such that the complete refraction angle, and hence the complete phase shift gradient, can be determined for each X-ray beam from the two scans with differently oriented phase grids in order to be able to show the phase shift of an examination object in terms of projections or in a tomographic image. | 07-15-2010 |
20100220834 | Method for Producing Projective and Tomographic Images Using an X-Ray System - An embodiment of the present invention discloses a method for producing projective and tomographic images using X-rays, allowing structures of similar composition to be imaged particularly well by combined evaluation of the behaviour of the test object with respect to the phase displacement during passage of the X-rays and its absorption. At least one embodiment of the invention also relates to an X-ray system and a CT system with respective source grids, phase grids, and analytical grids for carrying out the method. | 09-02-2010 |
20100278297 | GRATING WITH A LARGE ASPECT RATIO, IN PARTICULAR TO BE USED AS AN X-RAY OPTICAL GRATING IN A CT SYSTEM, PRODUCED BY A LITHOGRAPHY METHOD - A grating with a large aspect ratio is disclosed, in particular to be used as an X-ray optical grating in a CT system and in particular produced by a lithography method. In at least one embodiment, the grating includes a multiplicity of recurring alternating grating webs and grating gaps with a height, and a multiplicity of filler beams, respectively arranged in the grating gaps with a spacing from one another in the direction of the gaps, which beams connect respectively adjacent grating webs over their height. In at least one embodiment, the grating webs and the grating gaps run from a first to a second side of the grating, and a filler beam has a width in the direction of the gaps and this width is at most 10% of the spacing between two adjacent filler beams. In at least one embodiment, the spacings between respective adjacent filler beams in a grating gap do not vary by more than 10% in the entire grating. At least one embodiment of the invention furthermore relates to a CT system containing at least one grating according to at least one embodiment of the invention. | 11-04-2010 |
20100278298 | CT SYSTEM AND METHOD FOR PHASE-CONTRAST AND ABSORPTION IMAGING - A CT system is disclosed for phase-contrast and absorption imaging with a plurality of emitter-detector systems. In at least one embodiment, there are at least two emitter-detector systems and the at least two emitter-detector systems have a different distance between radiation focus and detector and there is a computational element for calculating phase-contrast images on the basis of the solution to the intensity transport equation. Moreover, at least one embodiment of the invention relates to a method for phase-contrast and absorption imaging using such a CT system by comparing attenuation images recorded at different distances of a detector from a multiplicity of projection angles by solving the intensity transport equation and reconstruction or comparison of two tomographic and three-dimensional image data records, reconstructed from projections, which were recorded at different distances. | 11-04-2010 |
20110025691 | METHOD AND DEVICE FOR DISPLAYING COMPUTED-TOMOGRAPHY EXAMINATION DATA FROM AN EXAMINATION OBJECT - A method and a device are disclosed for displaying computed-tomography examination data from an examination object. In at least one embodiment, there firstly is of the examination object at least one first CT image data record with pixel or voxel values, which were reconstructed on the basis of quantitatively measured absorption data of X-ray beams passing through the examination object; and there secondly is at least one second CT image data record with pixel or voxel values, which were reconstructed on the basis of quantitatively determined phase shifts of X-ray beams passing through the examination object. In at least one embodiment, the at least one first CT image data record and the at least one second CT image data record are combined together pixel-by-pixel or voxel-by-voxel using a nonlinear function, and the combined values resulting therefrom are displayed visually as CT results image data record. | 02-03-2011 |