摘要:
The present invention provides for an x-ray system and method using dynamic automated spatial modulation of an x-ray beam. The system includes an x-ray source (105) transmitting a spatially modulated beam (110) towards an object (120) to be imaged, an x-ray detector (140) receiving the beam and measuring a plurality of intensities across the beam, a beam processor (160) controlling the beam intensity profile, and an image processor (170) producing an output image signal (190). The detector produces a residual image based on at least the intensities measured at the detector. The beam intensity profile may be based on at least some of the following: (a) the residual image from the x-ray detector, (b) current beam intensities, (c) regions on interest in the image, and (d) predicted or measured object motion in the image. The system's output image is based on one or more of said residual image and said beam intensity signal.
摘要:
The invention relates to improving the tomographic image quality by preventing the tomographic image contrast from degrading and preventing artifact from occurring even if many scattered radiations occur. An X-ray detection array obtains first detection data using the X-ray detection elements corresponding to an area not shielded by a collimator. In this case, the first detection data is generated by: an X-ray directly irradiated to X-ray detection elements from an X-ray tube through an imaging object; and the X-ray as a scattered radiation from the X-ray tube through the imaging object. Further, the X-ray detection array obtains second detection data using the X-ray detection elements corresponding to an area shielded by the collimator. In this case, the second detection data is generated by the X-ray as a scattered radiation. A central processing unit corrects the first detection data based on the detection data including the first and second detection data. Finally, the central processing unit generates a tomographic image for an imaging area of the imaging object.
摘要:
Röntgeneinrichtung umfassend eine Strahlungsquelle, einen austauschbaren Strahlungsfilter und eine Flächendosismesseinrichtung umfassend eine Messkammer mit zugeordneter Auswerteeinrichtung zur Ermittlung des Flächendosisprodukts anhand der von der Messkammer gegebenen Messsignale, wobei die Messkammer bezogen auf die Strahlungsrichtung vor dem Filter im Strahlengang angeordnet ist, wobei Mittel zum Erkennen der Art und/oder des Typs des Strahlungsfilters (6) vorgesehen sind, wobei die Auswerteeinrichtung (15) zum Korrigieren des ermittelten Flächendosisprodukts anhand wenigstens eines filterspezifischen Korrekturwerts (a 1 , b 1 , c 1 , ..., d n , e n , f n ) ausgebildet ist.
摘要:
The present invention includes a filtering apparatus for a CT imaging system or equivalently for an x-ray imaging system. The filtering apparatus may be translated along a first axis or a transverse axis to with respect to an attenuation pattern of a subject during an imaging session to reduce radiation exposure to anatomical regions of the subject sensitive to radiation exposure and/or regions from which data is not being acquired
摘要:
The present invention is directed to a method and apparatus of multi-energy data acquisition. An imaging system (10) is also provided and includes a number of HF electromagnetic energy filters (90, 96). The filters include at least a first and a second filter (90, 92) wherein the first filter (90) is positioned in a path of HF electromagnetic energy (16) when an HF electromagnetic energy source (14) is energized to a first voltage A and the second filter (92) is positioned in the path of HF electromagnetic energy (16) when the HF electromagnetic energy source (14) is energized to a second voltage B.
摘要:
Röntgeneinrichtung umfassend eine Strahlungsquelle, einen austauschbaren Strahlungsfilter und eine Flächendosismesseinrichtung umfassend eine Messkammer mit zugeordneter Auswerteeinrichtung zur Ermittlung des Flächendosisprodukts anhand der von der Messkammer gegebenen Messsignale, wobei die Messkammer bezogen auf die Strahlungsrichtung vor dem Filter im Strahlengang angeordnet ist, wobei Mittel zum Erkennen der Art und/oder des Typs des Strahlungsfilters (6) vorgesehen sind, wobei die Auswerteeinrichtung (15) zum Korrigieren des ermittelten Flächendosisprodukts anhand wenigstens eines filterspezifischen Korrekturwerts (a 1 , b 1 , c 1 , ..., d n , e n , f n ) ausgebildet ist.
摘要:
Systems and methods for radiographic imaging of tissue using a radio-opaque imaging agent that in one embodiment accumulates intracellularly in tissue in proportion to its functional, or physiological, activity. In one embodiment, the imaging agent is a cell membrane-permeable, radio-opaque, high affinity ligand for an intracellullar target. The imaging agent is administered to a patient, and after an accumulation interval, radiographic images are acquired. The imaging agent preferentially accumulates in certain types of tissue and increases its radio-opacity. The tissue being examined is transilluminated by X-ray beams with preselected different mean energy spectra, and a separate radiographic image is acquired during transillumination by each beam. An image processing system may perform a weighted combination of the acquired images to produce a single displayed image. The system and method thus provides a functional image displayed with the anatomical detail and spatial resolution of a radiographic image. Functional and anatomical information are displayed in complete registration, facilitating localization of abnormal tissue in relation to nearby anatomical structures.
摘要:
Die Erfindung betrifft einen Computertomographen dessen Strahlenquelle ein kegelförmiges Strahlenbündel emittiert und den Untersuchungsbereich entlang einer Trajektorie in Form einer Helix abtasten kann. Die mit der Strahlenquelle verbundene Detektoreinheit besteht dabei aus mehreren räumlich voneinander getrennten und in axialer Richtung gegeneinander versetzten Detektorsegmenten, in denen jedes so angeordnet ist, dass eine Projektion auch die Helix mindestens zwei benachbarter Windungen der Helix bedeckt. Aus den von einer solchen Detektoreinheit akquirierten CT-Daten lässt sich ein CT-Bild mit verbessertem und räumlich homogener verteiltem Signal/Rauschverhältnis rekonstruieren.