263 results about "X ray radiography" patented technology

The present embodiments relate to a mammograph system with a face shield. The mammography system includes an X-ray emitter head; an object table; and a face shield. The face shield is movably supported by the X-ray emitter head and is movable into at least first and second positions. In the first position, the face shield is retracted into the X-ray emitter head. In the second position, at least a portion of the face shield protrudes out of the X-ray emitter head.

The present invention generally refers to a correction method for grating-based X-ray differential phase contrast imaging (DPCI) as well as to an apparatus which can advantageously be applied in X-ray radiography and tomography for hard X-ray DPCI of a sample object or an anatomical region of interest to be scanned. More precisely, the proposed invention provides a suitable approach that helps to enhance the image quality of an acquired X-ray image which is affected by phase wrapping, e.g. in the resulting Moiré interference pattern of an emitted X-ray beam in the detector plane of a Talbot-Lau type interferometer after diffracting said X-ray beam at a phase-shifting beam splitter grating. This problem, which is further aggravated by noise in the obtained DPCI images, occurs if the phase between two adjacent pixels in the detected X-ray image varies by more than π radians and is effected by a line integration over the object's local phase gradient, which induces a phase offset error of π radians that leads to prominent line artifacts parallel to the direction of said line integration.

The invention relates to a method for eliminating error elements caused by movements of an imaged object in X-radiography, said method comprising performing X-radiography on an imaged object for compiling three-dimensional X-radiographic information. The method comprises creating a model geometry of an X-ray imaging process, said creation work comprising a determination of the location for two or more position markers in a set of coordinates graded for an X-ray imaging apparatus. When X-radiography of an imaged object is completed, predictions are worked out regarding the locations of position markers during the imaging session. The locations and predictions determined on the basis of the model geometry are used as a basis for defining projected or most likely locations for the position markers and an automatic position markers identification method is applied for finding the locations of position markers from within a search area in the X-radiographic information. When the locations of at least two position markers have been found with the automatic position markers identification method, a minimization of offsets between the projected locations of position markers and the locations of position markers looked up by the automatic identification method is performed by searching for a minimum point of the function for eliminating the error elements resulting from movements of an imaged object.

Methods and systems for use in generating a volumetric reconstruction of an object using scattered X-ray radiography. An X-ray beam is directed towards a point within a target object. Scattered X-rays are measured by detectors and measurement data is stored. The X-ray beam is directed towards different points. Measurement data associated with each point is analyzed using a ray tracing methodology to assign contrast values to each point. A volumetric image is generated therefrom.

It is made possible that, in accordance with a plurality of radiographing modes such as the still image radiographing mode and the moving image radiographing mode, the outputs both in the irradiation period and in the non-irradiation period are made to fall within the dynamic range of the radiographing system, whereby an accurate, high-S / N-ratio X-ray radiographic image is obtained. For that purpose, in accordance with the plurality of radiographing modes, an arithmetic operation unit adjusts a power source to control voltage to be applied to a reading circuit unit or an Analogue-Digital conversion unit, such that, in each of the radiographing modes, both an electric signal in the X-ray irradiation period and an electric signal in the X-ray non-irradiation period fall within the dynamic ranges of the reading circuit unit and the Analogue-Digital conversion unit.

A method for using computer-aided diagnosis (CAD) for digital tomosynthesis mammograms (DTM) including retrieving a DTM image file having a plurality of DTM image slices; applying a three-dimensional gradient field analysis to the DTM image file to detect lesion candidates; identifying a volume of interest and locating its center at a location of high gradient convergence; segmenting the volume of interest by a three dimensional region growing method; extracting one or more three dimensional object characteristics from the object corresponding to the volume of interest, the three dimensional object characteristics being one of a morphological feature, a gray level feature, or a texture feature; and invoking a classifier to determine if the object corresponding to the volume of interest is a breast cancer lesion or normal breast tissue.

Intraoral tomosynthesis systems, methods, and computer readable media for dental imaging are provided. The system includes an x-ray source containing multiple focal spots spatially distributed on one or multiple anodes in an evacuated chamber, an x-ray detector for positioning inside a mouth of a patient, a device for determining imaging geometry of the intraoral tomosynthesis system; and control electronics configured to regulate the x-ray source, by sequentially activating each of the multiple focal spots, such that multiple two dimensional (2D) projection images of the mouth of the patient are acquired from multiple viewing angles. In some aspects, the device for determining the imaging geometry can comprise a plate connectedly attached to the x-ray detector, at least one light source connectedly attached to the x-ray source, and a camera configured to capture at least one light spot produced by a projection of at least one light beam onto the plate.

Apparatus for compressing tissue to be scanned for medical imaging is provided. The apparatus may comprise a compression membrane and a tensioning apparatus coupled to the membrane to apply a tensile force to the membrane to place the membrane in a taut condition during an imaging process. In one exemplary application that combines ultrasound scanning with X-ray mammography, the compressing apparatus enables accurate, reproducible ultrasound images reducing distortion and attenuation, which may otherwise be introduced as a consequence of such a combination of imaging processes.

A radiation detector is realized as, for example, a flat panel detector (FPD) for two-dimensionally detecting X-rays. The detector comprises a detection board and a control unit. The detection board on which a plurality of detection elements for detecting a radiation are two-dimensionally disposed in a matrix and circuits for collecting signals from the detection elements. The control unit for controlling the detection board so that the detection board is placed in a predetermined temperature state. The predetermined temperature state is defined, for example, as predetermined ranges of temperatures used during the operation and the non-operation states of the detector, respectively. This radiation detector can be mounted in a radiography system such as an X-ray radiography system.

An X-ray radiography system for differential phase contrast imaging of an object under investigation by phase-stepping is provided. The X-ray radiography has an X-ray emitter for generating a beam path of quasi-coherent X-ray radiation, an X-ray image detector with pixels arranged in a matrix, and a diffraction or phase grating, in which the X-ray emitter has an X-ray tube with a cathode and an anode. The X-ray tube is constructed in such a way that an electron ray beam originating from the cathode is associated with focusing electronics which produce, from electrons which are incident on an anode, at least one linear-shaped electron fan beam.