Abstract: An X-ray system comprises an assembly that is moveable to different scan coordinates to acquire X-ray projection images at the different scan coordinates in a dynamic mode while the assembly is moving. The assembly is also moveable to a predetermined reference coordinate to acquire an X-ray projection image at the predetermined reference coordinate in a static mode while the assembly is resting. The X-ray system also comprises a processor configured to obtain dynamic gain calibration parameters from the X-ray projection images acquired in the dynamic mode at one of the different scan coordinates; obtain a static gain calibration parameter from the X-ray projection image acquired in the static mode at the predetermined reference coordinate; and determine adjusted dynamic gain calibration parameters.

Abstract: Systems and method for performing X-ray computed tomography (CT) that can improve spectral separation and decrease motion artifacts without increasing radiation dose are provided. The systems and method can be used with either a kVp-switching source or a single-kVp source. When used with a kVp-switching source, an absorption grating and a filter grating can be disposed between the X-ray source and the sample to be imaged. Relative motion of the filter and absorption gratings can by synchronized to the kVp switching frequency of the X-ray source. When used with a single-kVp source, a combination of absorption and filter gratings can be used and can be driven in an oscillation movement that is optimized for a single-kVp X-ray source. With a single-kVp source, the absorption grating can also be omitted and the filter grating can remain stationary.

Abstract: A base for a mobile X-ray imaging system comprises a carriage, a mounting structure mounted to the carriage and that movably holds an imaging device, a wheel base, and a controller. The wheel base comprises at least three wheels mounted to the carriage to be pivotable around a vertical pivot axis and to rotate around a horizontal wheel axis. At least two of the wheels form rearside wheels and at least one of the wheels forms a frontside wheel. Each rearside wheel is independently steerable in its orientation around the vertical pivot axis by a pivot actuator. Each rearside wheel is independently drivable around its horizontal wheel axis by a drive actuator to move the base relative to the floor. The controller steers and drives the rearside wheels.

Abstract: An X-ray tube has at least one grid electrode arranged between an anode electrode and a cathode electrode. Via a focusing unit, an electron flow from the cathode electrode to the anode electrode is focused in that the focusing unit supplies the grid electrode with a first electric grid potential. The focusing unit is supplied with electrical energy in an electrically isolated manner via an energy converter. The first electric grid potential is provided via an adjustable voltage divider, and the adjustable voltage divider is adjusted via a control circuit of the focusing unit in that the control circuit is supplied with an electrically isolated control signal of a control unit. The control signal depends on a value for the first electric grid potential.

Abstract: Mercury that may be contaminated radioactively is converted with radionuclides of other elements to a gaseous state of aggregation, which increases the distance between the mercury atoms and reduces the shielding effect of the mercury with respect to the radionuclides of other elements contained in the mercury. The method disclosed, enables the radiological characterisation of the radiation listing of mercury, without prior processing, in particular homogenization, of the sample being necessary. In particular, the method enables continuous measurement of the entire mass to be characterized and includes preparing a predefined quantity of mercury, evaporating at least one fraction of the prepared mercury, and measuring the radioactive ?-radiation emitted by the gaseous mercury.

Abstract: An apparatus for real-time visualizing a movement of a lower jaw versus an upper jaw including: an input interface for receiving a two-dimensional image signal of the craniomaxillofacial area of the patient from a camera and a three-dimensional jaw model of the craniomaxillofacial area of the patient being precalculated based on volume data; a registration unit for registering the three-dimensional jaw model with the two-dimensional image signal in a first jaw position of the lower jaw versus the upper jaw and in a second jaw position of the lower jaw versus the upper jaw; an imaging unit for generating a two-dimensional depth-view of the craniomaxillofacial area from the three-dimensional jaw model based on the conducted registrations and the two-dimensional image signal, the two-dimensional depth-view including a structure underlying an image area of the two-dimensional image signal; and an output interface for outputting the two-dimensional depth-view.

Abstract: In order to sufficiently capture spatial distortion specific to an X-ray CT device and evaluate the three-dimensional shape measurement accuracy of the X-ray CT device, in a utensil, by attaching support rods fixing spheres to the tip thereof and having different lengths to a base spheres are arranged in an XYZ space on the base. On a flat surface on the top of the base, the support rods supporting the spheres and having different lengths are arranged at predetermined intervals. In doing so, the spheres are arranged in the XYZ space respectively at appropriate inter-sphere distances.

Abstract: An imaging system is disclosed to include an elongate member supported by a plurality of wheels, where the elongate member is extendable in a horizontal axis such that a distance between two of the plurality of wheels is increased when the elongate member is extended in the horizontal axis; a trolley slidably secured to the elongate member, where the trolley includes a base portion and an upper portion. The base portion moves in the horizontal axis along the elongate member and the upper portion is rotatably mounted to the base portion, where the upper portion is configured to rotate at least 90 degrees relative to the base portion and elongate member.

Abstract: Various methods and systems are provided for medical imaging systems. In one example, an imaging system comprises: a C-shaped gantry; an x-ray tube coupled to a first end of the C-shaped gantry; an x-ray detector coupled to a second end of the C-shaped gantry, opposite to the x-ray tube; and a controller with computer readable instructions stored on non-transitory memory that when executed, cause the controller to: identify a reference image; determine a target electrical current based on the reference image; determine a corrected electrical current based on the target electrical current; and transition an electrical current provided to the x-ray tube to the target electrical current by commanding the electrical current to the corrected electrical current while maintaining a constant voltage provided to the x-ray tube.

Abstract: Provided is a PET scanner system having a PET scanner gantry that is configured for delivering a uniformly distributed cooling air to a plurality of detectors housed in the PET scanner gantry. The PET scanner gantry includes a cooling air delivery manifold that includes a patient tunnel portion; and a front funnel portion. The front funnel portion includes an annular interior wall defining an entry opening of the patient tunnel portion; and an air plenum has an annular structure for carrying a flow of pressurized cooling air received from a remote source supplements the pressurized cooling air with a supply of ambient air and directs it to the plurality of detectors.

Abstract: A transport system with curved track pair is constructed for multiple pulsed X-ray source-in-motion to perform fast digital tomosynthesis imaging. It includes a curved rigid track pair with predetermined curvature, a primary motor stage car loaded with X-ray sources and wheels loaded with tension or compression springs. The car is driven by primary motor mounted at base frame and an engaged gear mounted at the car. The car can carry heavy loads, travel with high precision and high repeatability at all installation orientations while motion vibration is minimal. It is also scalable to have a larger radius. Track angle span usually can be from about ten degrees to about 170 degrees. During imaging acquisition, X-ray sources can sweep precisely from one location to another. The car has enough clearance to move in its path without rubbing wheels on tracks. Better than 0.2 mm overall spatial precision can be achieved with the digital tomosynthesis imaging.

Abstract: Methods, devices, and systems for computed tomography (CT) imaging technologies that are tailored to specific regions of interest and provide a reduced radiation dose. An imaging system for cardiac CT comprises a beam-shaping filtration and exposure control technologies specifically tailored to imaging of the heart.

Abstract: A system and method can determine one or more CT scanner calibration parameters from a plurality of calibration object projections in a plurality of radiographs.

Abstract: Apparatuses (devices, systems) and methods for shielding (protecting) surroundings around periphery of regions of interest located inside objects (e.g., patients) from radiation emitted by X-ray systems towards the objects. Apparatus includes: at least one radiation shield assembly including a support base connectable to an X-ray system radiation source or detector, and a plurality of radiation shield segments sequentially positioned relative to the support base, thereby forming a contiguous radiopaque screen configured for spanning around the region of interest periphery with a radiopaque screen edge opposing the object. Radiation shield segments are individually, actively controllable to extend or contract to selected lengths with respective free ends in directions away from or towards the support base(s), for locally changing contour of the radiopaque screen edge.

Abstract: An x-ray scanning system, and corresponding method, includes an x-ray source that produces incident x-ray radiation having end-point x-ray energy, which, in various embodiments, can be greater than about 200 keV, between about 200 keV and about 500 keV, or greater than about 500 keV. The system also includes a disk chopper wheel that can be irradiated by and attenuate the incident x-ray radiation. The disk chopper wheel further defines one or more slits configured to pass the incident x-ray radiation through the disk chopper wheel for scanning a target. In some embodiments, the high end-point x-ray energies with disk chopper wheels are facilitated by forming the incident x-ray radiation as a collimated fan beam and/or orienting the chopper wheel with a wheel plane substantially non-perpendicular to a fan beam plane, increasing effective thickness of a disk chopper wheel to attenuate incident x-rays of higher energies.

Abstract: An imaging system is disclosed. The imaging system is operable to acquire and/or generate image data at positions relative to a subject. The imaging system includes a drive system configured to move the imaging system.

Abstract: A self-lubricated sliding bearing for a rotary X-ray tube comprises a first bearing member, a second bearing member configured to concentrically enclose a portion of the first bearing member, and a lubricant comprised in a gap between cooperating surfaces of the first bearing member and the second bearing member. The cooperating surface of the second bearing member or the first bearing member comprises a first region comprising a pumping pattern configured to pump the lubricant. The cooperating surface of the second bearing member or the first bearing member comprises a second region having a modified pumping pattern or a smooth surface.

Abstract: A computer-tomography (CT) imaging system, comprising an imaging data acquisition system. The imaging data acquisition system includes a plurality of sets of a detector section, a storage section, and an aggregation section. The detector section includes a plurality of detector elements each being configured to convert radiation into electric signals. The aggregation section is configured to aggregate imaging data carried by the electronic signals from the detector section. The storage section is connected with an output of the detector section and an input of the aggregation section. The storage section comprises a predetermined number of non-volatile memories to store the imaging data from the corresponding detector elements.

Abstract: Embodiments can provide a visual indicator system, attachable to a medical imaging patient bed. The visual indicator system comprising: one or more light strips, each light strip comprising a plurality of lights; a distance meter, attachable to one end of the medical imaging patient bed; a storage device, configured to store one or more preconfigured finger gestures; and a microcontroller. The one or more light strips are attachable to the medical imaging patient bed; wherein the microcontroller is configured to illuminate the one or more light strips after the one or more preconfigured finger gestures are made with respect to the one or more light strips. A position of the illumination of the light strip corresponds to a position of performing the one or more preconfigured finger gestures and one or more distance measurements received from the distance meter.

Abstract: Methods and systems for selection of dosimetry levels and sphere amounts of radioactive compounds for use in a radioembolization procedure for procedure planning may include inputting activity parameter information into a dosimetry portal of a dosimetry selection tool; determining a customized activity based on the activity parameter information and one or more customized activity algorithms; generating one or more sphere amount and dosage recommendations based on the customized activity and one or more dosimetry selection algorithms; selecting one of the one or more sphere amount and dosage recommendations as a selected sphere amount and dosage recommendation; and generating a radioactive compound order for the radioembolization procedure based on the customized activity and the selected sphere amount and dosage recommendation.