摘要:
According to one embodiment, an X-ray diagnostic apparatus includes an X-ray generation unit, X-ray detection unit, X-ray beam limiting unit, and X-ray beam limiting control unit. The X-ray generation unit generates X-rays. The X-ray detection unit detects the X-rays generated by the X-ray generation unit and transmitted through an object placed on a tabletop. The X-ray beam limiting unit includes a plurality of filters to harden radiation quality of the generated X-rays. The X-ray beam limiting control unit controls the X-ray beam limiting unit to place a filter between the X-ray generation unit and the object, which filter is specified from the plurality of filters based on the thickness of the object and the distance between the X-ray generation unit and the X-ray detection unit.
摘要:
First and second grids are arranged between an X-ray source and an X-ray image detector. The first and second grids have the similar configuration except for width, pitch, and thickness of X-ray absorbing sections. The first grid is composed of subdivision grids arranged with substantially no space between each other on a flat surface of a substrate made of glass, for example. Each subdivision grid has a shape of a regular hexagon. Each subdivision grid has the X-ray absorbing sections and X-ray transmitting sections extending in Y direction and arranged alternately in X direction. The X-ray absorbing sections of the adjacent subdivision grids are aligned substantially parallel to each other. The X-ray transmitting sections of the adjacent subdivision grids are aligned substantially parallel to each other. No side of the subdivision grid is parallel to an extending direction of the X-ray absorbing sections and the X-ray transmitting sections.
摘要:
In a radiographic apparatus, positions of a radiation grid and a radiation detector are determined such that, when a radiation source and the radiation detector are in a standard position, an arrangement pitch of shadows of absorbing foil strips appearing on a detecting plane of the radiation detector as a result of a radiation beam being emitted from the radiation source and blocked by the radiation grid is an integral multiple of an arrangement pitch in a transverse direction of radiation detecting elements. Further, the shadows of the absorbing foil strips appear without covering transversely adjacent pairs of the detecting elements.
摘要:
The invention relates to a process for acquisition of one or more radiological image(s) of an object of a region of interest on a patient, obtained by means of a radiological imaging system, in which the system includes: a radiation source, a detector arranged opposite the source and at least one anti-diffusion grid, which process includes steps consisting of: determining characteristics of the object to be imaged; controlling, according to the characteristics determined, a movement of the anti-diffusion grid in order to position it in or remove it from an operational position between the object and the detector, in which the operational position corresponds to a position of the grid centered on the source-detector axis and parallel to the plane including the detector; and acquiring images of the structure exposed to the radiation emitted by the source.
摘要:
When generating a 3D image of a subject or patient, a cone beam X-ray source (20a, 20b) is mounted to a rotatable gantry (14) opposite an offset flat panel X-ray detector (22a, 22b). A wedge-shaped attenuation filter (24a, 24b) of suitable material (e.g., aluminum or the like) is adjustably positioned in the cone beam to selectively attenuate the beam as a function of the shape, size, and density of a volume of interest (18) through which X-rays pass in order to maintain X-ray intensity or gain at a relatively constant level within a range of acceptable levels.
摘要:
An extreme ultra-violet lithographic apparatus for imaging a pattern onto a substrate includes a radiation system constructed and arranged to provide a beam of an extreme ultra-violet radiation, and an absorber arranged in the beam and constructed and arranged to absorb at least a portion of the radiation beam. The absorber has a volume configured to accommodate a flow of an absorbing gas. The flow is directed in a transverse direction with respect to the beam. The absorber includes a structure having an extreme ultra-violet radiation-transmissive beam entry area and an extreme ultra-violet radiation-transmissive beam exit area. The apparatus also includes a gas inlet actuator array configured to inject the gas into the volume and a gas outlet actuator array arranged to evacuate the gas from the volume.
摘要:
A composite material is constituted by fine nano-oxide particles, a dispersant, and a transparent resin material. The dispersant includes a polymer of vinyl monomer having a binding acidic group. When φ is a dimensionless number defined by an average particle size (nm) of the fine nano-oxide particles divided by nm, the polymer has a degree of polymerization of an integer of 3 or more and 8×φ or less with the proviso that the integer is a numerical value obtained by dropping a decimal fraction. The composite material is produced through a step of obtaining a dispersant comprising a polymer by polymerizing a vinyl monomer having a binding acidic group in the presence of polyamine or in an aqueous dilute dispersion, and a step of mixing the dispersant, fine nano-oxide particles, and a transparent resin material.
摘要:
Methods and apparatus for generating an x-ray image. An object is interposed between a detector and an x-ray source. A grid is interposed between the x-ray source and the object. The grid is exposed to primary x-ray energy generated by the x-ray source, thereby exposing the object to a first portion of the primary energy via the interstices of the grid. A second portion of the primary energy is received with first areas of the detector corresponding to the interstices of the grid. Secondary x-ray energy is received with the first areas of the detector and with second areas of the detector corresponding to the elements of the grid. The secondary energy results from scattering of the primary x-ray energy. Image data are generated by altering data from the first areas with reference to data from the second areas.
摘要:
The invention relates to a radiation protection material for the screening of X- and/or gamma-rays, made from a film-like multi-layer composite material, in which radiation absorbing particles are dispersed. The composite material comprises at least one support layer and a radiation absorbing layer, whereby the radiation absorbing layer comprises a hardening polymeric preparation, which can flow in the working state and with an effective lead content of ≦15%.
摘要:
A flame-retardant and electromagnetic wave-shielding thermoplastic resin composition is provided, which comprises 100 parts by weight of a thermoplastic resin (A); from 0.5 to 30 parts by weight of a flame retardant of a halogen-free phosphate (B) represented by the following general formula (1): wherein R1, R2, R3, and R4 each independently represent a hydrogen atom or a monovalent organic group, at least one of R1, R2, R3, and R4 is a monovalent organic group, X is a bivalent organic group, k, l, m, and n are each independently 0 or 1, and N is an integer of 0 to 10; from 5 to 35 parts by weight of a metal-coated fiber (C); and from 3 to 30 parts by weight of a filler in a scaly shape or an acicular shape (D). Such a composition has excellent flame retardance, good appearance, and excellent molding flowability.