107 results about "Hard X-rays" patented technology

An interferometer for X-rays, in particular hard X-rays, for obtaining quantitative phase contrast images, includes a standard polychromatic X-ray source, a diffractive optical beam splitter other than a Bragg crystal in transmission geometry, and a position-sensitive detector with spatially modulated detection sensitivity.

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.

Phase sensitive X-ray imaging methods can provide substantially increased contrast over conventional absorption based imaging, and therefore new and otherwise inaccessible information. The use of gratings as optical elements in hard X-ray phase imaging overcomes some of the problems that have impaired the wider use of phase contrast in X-ray radiography and tomography. So far, to separate the phase information from other contributions detected with a grating interferometer, a phase-stepping approach has been considered, which implies the acquisition of multiple radiographic projections. Here,an innovative, highly sensitive X-ray tomographic phase contrast imaging approach is presented based on grating interferometry, which extracts the phase contrast signal without the need of phase stepping. Compared to the existing phase step approach, the main advantage of this new method dubbed 'reverse projection' is the significantly reduced delivered dose, without degradation of the image quality. The new technique sets the pre-requisites for future fast and low dose phase contrast imaging methods, fundamental for imaging biological specimens and in-vivo studies.

A zone plate multilayer structure includes a substrate carrying a plurality of alternating layers respectively formed of tungsten silicide (WSi₂) and silicon (Si). The alternating layers are sequentially deposited precisely controlling a thickness of each layer from a minimum thickness of a first deposited layer adjacent the substrate to a maximum thickness of a last deposited layer. The first minimum thickness layer has a selected thickness of less than or equal to 5 nm with the thickness of the alternating layers monotonically increasing to provide a zone plate multilayer structure having a thickness of greater than 12 μm (microns). The x-rays are diffracted in Laue transmission geometry by the specific arrangement of silicon and tungsten silicide.

New type X ray tube is capable of generating X beam of rays with high spatial coherence, large dose, and large emission angle. Anode in extended electron beam or ion beam bomb structure, or structured electron beam or non-structured ion beam bomb is adopted in the invention to generate parallel-arranged linear array of emitter of X ray. Modes in structured electron or ion beam emitter, or structured grid, or electron or ion beam scan are adopted to realize emitter of X ray. Parallel-arranged periodic structure composed of high Z metal strips with narrow enough line width is adopted for structured anode. The disclosed X ray tube is workable under mode of continuous operation, or mode of pulse operation; and capable of outputting hard X ray or soft X ray. The invention is applicable to fundamental research in areas of biology, medical science, and material science etc. or in use for areas of disease diagnosis, industrial non-destructive inspection, online test etc.

An x-ray target, a method of using the x-ray target, and a computer program product with instructions for carrying out a method of using the x-ray target. The x-ray target includes a substrate made from a soft x-ray producing material and a high aspect ratio structure made from a hard x-ray producing material. The hard x-ray producing material is embedded in the substrate, formed on the substrate, cantilevered out from the edge of the substrate, or any combination thereof. The high aspect ratio structure comprises a plurality of high aspect ratio structures arranged in one or more grids or arrays, and the high aspect ratio structures in one of the one or more grids or arrays are arranged to form a Hadamard matrix structure.

Phase-matched high-order harmonic generation of soft and hard X-rays is accomplished using infrared driving lasers in a high-pressure non-linear medium. The pressure of the non-linear medium is increased to multi-atmospheres and a mid-IR (or higher) laser device provides the driving pulse. Based on this scaling, also a general method for global optimization of the flux of phase-matched high-order harmonic generation at a desired wavelength is designed.

A process for the production of optical broad band elements for the ultra violet to hard x-ray wavelength range, especially the extreme ultra violet wavelength range is described. A set from series of layers made of at least two materials in relation to the layer sequence is designed and numerical optimization of the the layer thicknesses and of the cap layer thickness is performed. The materials are chosen in such a way that two successive layers interact with each other as little as possible or controllably. The set can be formed from MO₂C— and Si-layers. The numerical optimization takes into account interlayers of a certain thickness and composition.

A repetitive frequency fast pulse hard X-ray generator, diode of the invention is constructed by fixed supporting tubular and sliding supporting tubular, they are connected tightly by the bellows, and grooved rail is set on the bell socket part, rotating otter cylinder is set at the outer to drive the sliding supporting tubular move along the grooved rail; cathode connecting bar is set at the axis in cavity, the front end is cathode target; conical packing ring is set in the cavity of diode to divide the cavity into fore vacuum chamber and back oil recess; anode assembly are fixed at the fore and outer end of the diode. The invention designs the diode to be an active structure, that resolves the technique puzzle of stability of power source, vacuum tightness of diode, axiality of dynamic and static supporting, flexible adjustment on-line; on the precondition of not destroying the vacuum, adjusting aspect ratio flexibly can be realized, the current detecting detector is built; it possesses advantages of flexible structure, repeatable frequency or running for one time, and the pulse width, intensity and power spectrum can be adjustable continuously, it compensates for defects of current technique, and it provides ideal field of radiation for development and application of new type rapid response detector, building fast pulse hard X-ray metering standard, physical mechanism research of diode and pulse ray dynamic imaging technique.

[Problems to be Solved] It is an object of the present invention to provide a novel radiographic image detector which can detect radiation, such as hard X-rays or γ-rays, with high sensitivity and which is excellent in position resolution and count rate characteristic.

[Means to Solve the Problems] A radiographic image detector comprises a combination of a scintillator, such as a lanthanum fluoride crystal containing neodymium, for converting incident radiation into ultraviolet rays; and a gas multiplication ultraviolet image detector for converting ultraviolet rays into electrons, amplifying such electrons by use of a gas electron avalanche phenomenon, and detecting the electrons. The radiographic image detector is characterized in that the gas multiplication ultraviolet image detector is basically constituted by a photoelectric conversion substance, such as cesium iodide or cesium telluride, for converting ultraviolet rays into electrons; a gas electron multiplier for amplifying electrons by use of the gas electron avalanche phenomenon; and a pixel electrode having an amplification function and a detection function.

The invention provides targets coated with structured biological materials, which are employed in laser produced plasma systems. The biological materials selected from cells of microbial, protozoan or plankton origin are applied on a portion of a solid target, like polished glass plate which then form a target system that absorbs the intense laser pulses, generates hot dense plasma and results in the emission of the X-rays. The method of coating structured biomaterial decreases the usable laser intensity required for producing the hot plasma, while increasing the X-ray yield. The coatings are easy to prepare and it is possible to vary the nature and shape of the cellular material in order to control/regulate the interaction with the light and thereby optimize the resultant plasma generation and X-ray emission. The increase in temperature of the plasma and the increase in yield demonstrate that the method is suitable for enhancing the emission yield in the Ultra Violet, Extreme Ultra violet, x-ray and the hard x-ray regimes.

The present invention discloses a flashing optical fiber panel and a preparation method, the preparation method comprises the following steps: 1, weighing each raw material according to the raw material composition, uniformly mixing all the raw materials and uniformly grinding to obtain a mixture; 2, pouring the mixture into a crucible, and putting the crucible into a reducing atmosphere glass melting furnace to prepare a glass melt; 3, leaking the glass melt to form a glass rod, placing the glass rod into a 500-700 DEG C muffle furnace for insulation, cooling with the furnace and naturally cooling for annealing; 4, cutting the annealed glass, grinding the surface, polishing, and processing into a sample, namely a flashing glass core rod; and 5, using the flashing glass as a core material for preparing the flashing optical fiber panel, matching the core material with leather material glass to pull into optical fiber, arranging the optical fiber, and molding by hot melt pressing to prepare a flashing optical fiber panel blank, and optically processing the flashing optical fiber panel blank to prepare the desired size flashing optical fiber panel; the flashing optical fiber panel achieves the low radiation dose and high-resolution imaging detection of hard X-rays and other high-energy rays.

The invention relates to an advanced multilayered Laue lens for hard X-ray focusing. The proper depth t of the cross section can be selected by changing the thickness ratio (gamma=dA/(dA+dB), A is an absorbing layer, B is a spacing layer) of two materials of a local grating of the multilayered Laue lens, and the efficiency of the advanced diffraction can greatly enhanced, so that the advanced diffraction can be efficiently utilized, and further, the focusing resolution ratio of the hard X-ray is enhanced. Compared with the traditional multilayered Laue lens, the invention provides an effective method for realizing the high-efficiency nanoscale hard X-ray focusing, which utilizes the advanced diffraction of the Laue lens to focus the hard X-ray, and overcomes the problem of the low advanced diffraction efficiency of the traditional wave zone plate by changing the thickness ratio of the different materials in the Laue lens structure.

The invention discloses a hard X-ray imaging detector, which solves the problems in the prior art that the time resolution and the spatial resolution are both low and the field of view is small when detecting hard X-rays so that the actual detection requirements cannot be met. The present invention includes a sealed vacuum cavity mainly surrounded by a detector frame, a ray filter window and a fluorescent screen, a multi-channel hard X-ray detection photocathode and a micro-channel plate, and a pulsed high-voltage power supply all arranged in the vacuum cavity. ; The pulse high-voltage power supply provides working voltage for the multi-channel hard X-ray detection photocathode and the micro-channel plate, and applies voltage between the multi-channel hard X-ray detection photocathode and the micro-channel plate and between the micro-channel plate and the fluorescent screen. The invention has simple structure, scientific and reasonable design, and is convenient to use. When detecting hard X-rays, the invention can effectively improve the time resolution, optimize the spatial resolution and object space resolution, and has the function of time gating, and has a large detection field of view at the same time. .

An X-ray article and method for analyzing hard X-rays which have interacted with a test system. The X-ray article is operative to diffract or otherwise process X-rays from an input X-ray beam which have interacted with the test system and at the same time provide an electrical circuit adapted to collect photoelectrons emitted from an X-ray optical element of the X-ray article to analyze features of the test system.

A multidimensional alignment apparatus is provided for multidimensional aligning of two linear multilayer Laue lenses (MLLs) for two-dimensional hard X-ray focusing. The multidimensional alignment apparatus precisely aligns and ensures stability of two linear MLLs performing hard x-ray focusing. The multidimensional alignment apparatus includes a base, a lower stages group controlling a first upstream MLL, an upper stages group positioned over the lower stages group controlling a second downstream MLL and an upper stage support attached to the base. The lower stages group provides five degrees of freedom precision positioning adjustment for the first upstream MLL. The second downstream MLL is mounted on the upper stages group with three degrees of freedom adjustment capability.

The invention relates to a bremsstrahlung reflection triode for generating strong pulse hard X rays. The problems that the gap potentials of two cathodes and anodes of an existing bremsstrahlung reflection triode are inconsistent, and a radiation field cannot be fully utilized are solved. The triode comprises a reflection triode cavity, an anode base, an anode, cathodes, transverse cover plates, aforward cover plate, an insulation plate fixing nut, an insulation plate transition piece and an insulation plate. The part, connected with the insulation plate, of the reflection triode cavity is acylinder, the part, away from the insulation plate, of the reflection triode cavity is transited into a closed cavity, and two parallel flat plates are arranged on the opposite surfaces of the closedcavity; the two cathodes are respectively arranged on the two flat plates of the closed cavity; the anode is positioned between the two cathodes; the anode is arranged on the anode base, the anode base is installed on a water line inner cylinder through the insulation plate transition piece, and the insulation plate transition piece is fixed through the insulation plate fixing nut. The transversecover plates are arranged on the two flat plates of the closed cavity respectively, and the forward cover plate is arranged at the axial tail end of the closed cavity.

An imaging technology for fuel cells is based on x-ray microscopy. A metrology system images the electrochemical interaction areas of solid-oxide fuel cells (SOFC) in-situ. This system takes advantage of both the penetrating power and elemental absorption contrast of hard x-ray radiation to image the internal interaction areas in a SOFC. The technology can further take advantage of the strong dependence of the x-ray absorption on material type and energy to distinguish the four major material types: cathode, electrolyte, air, and low-Z contaminants such as sulfur.

The invention relates to a vacuum diode with high current, small focal spot and long service life. The original diode in a repetition frequency fast-pulse hard X-ray generator is modified, the structure and the material of movable cathode and anode assemblies are improved, a cathode head is made of tungsten nickel copper alloy materials and is seated on a movable support, a conical hole structure inwards forming a sharp end bulge is used for emitting electrons and is aligned with X rays, and an anode target is made of metal tantalum materials and is fixedly arranged on a copper core wire through screw threads. The conical annular cathode structure is improved, the radius of sent plasmas is favorably controlled, dense plasmas can be conveniently obtained, the self pinching condition in the electronic beam transporting process is met, submillimeter beam spots are formed, and the detailed imaging requirement of the pulse imaging field is met.