613results about "Handling using diaphragms/collimeters" patented technology

The invention discloses a movable low-temperature collimator. The movable low-temperature collimator comprises an outer Dewar; the cold shield is mounted in the outer Dewar; the low-temperature vacuum cavity is installed in the cold shield, and the cold shield is used for shielding heat radiation of the outer Dewar to the low-temperature vacuum cavity; the heat insulation corrugated pipe cavity is installed in the outer Dewar, one end of the heat insulation corrugated pipe cavity penetrates through the end of the outer Dewar and then is connected with the normal-temperature vacuum pump chamber assembly, the other end of the heat insulation corrugated pipe cavity is connected with the low-temperature vacuum cavity, and the heat insulation corrugated pipe cavity is used for reducing heat conduction of the normal-temperature vacuum pump chamber assembly to the low-temperature vacuum cavity; the collimator target head is fixed through the outer Dewar and installed in the low-temperature vacuum cavity, and the collimator target head can move in the radial direction of the low-temperature vacuum cavity and absorb the high-energy ions so as to maintain the high vacuum degree of the low-temperature vacuum cavity. The device can be used for inhibiting the dynamic vacuum effect of a high-current heavy ion beam in a heavy ion superconducting synchronous ring, and the phenomena of ion loss, magnet quenching and vacuum degree avalanche caused by the dynamic vacuum effect are avoided.

An x-ray breast imaging system includes a breast support platform including an x-ray receptor, and an x-ray tube head. The x-ray tube head includes an x-ray source configured to emit an x-ray beam in a direction towards the x-ray receptor, and a collimator. A filter assembly including a plurality of filter slots selectively positionable adjacent to the collimator, and a specimen imaging filter disposed within a slot of the plurality of filter slots. The specimen imaging filter includes at least one aperture defined therein. The specimen imaging filter also blocks a portion of the emitted x-ray beam so that the at least one aperture defines a path of the emitted x-ray beam towards the x-ray receptor.

A method of determining a position offset includes receiving a first detection result from a first pixel of a plurality of pixels of a radiation detector, wherein the plurality of pixels are disposed on an incident side of the radiation detector on which an anti-scatter grid (ASG) is arranged, the plurality of pixels being aligned in at least a channel direction; receiving a second detection result from a second pixel of the plurality of pixels, wherein a septa of the ASG is arranged over a portion of the first pixel but is not arranged over any portion of the second pixel as viewed from the incident side of the radiation detector; estimating a positional offset of the septa of the ASG, based on the first detection result and the second detection result.

The invention discloses an electron microscope diaphragm and a preparation method thereof, the electron microscope diaphragm comprises a top layer metal, a top layer silicon, a buried oxide layer, a bottom layer silicon and a bottom layer metal which are distributed from top to bottom, the top layer silicon is connected with the bottom layer silicon through the buried oxide layer, the top layer metal is in adhesion connection with the top layer silicon, and the bottom layer metal is in adhesion connection with the bottom layer silicon; the outer boundary of the diaphragm is rectangular, and the length of the rectangle is 1-50mm; the diaphragm hole penetrates through the top layer metal, the top layer silicon, the buried oxide layer, the bottom layer silicon and the bottom layer metal, the characteristic size of the diaphragm hole is 2-1000 microns, and the diaphragm hole can be any geometric figure. The method has the advantages of being simple in principle, convenient to prepare, wide in application range and the like, and solves the problems that the diaphragm processing technology is high in requirement, and the non-circular diaphragm hole preparation requirement is difficult to meet.

An imaging device is provided. The imaging device includes an X-ray tube, a collimator, and a detector. The collimator includes an opening, wherein the collimator has a width in a first direction and a length in a second direction. The opening has an opening width in the width direction of the collimator, and an opening at at least one end of the collimator in the second direction has an opening width smaller than that of an opening within the middle section of the collimator.

The invention relates to a low-shadow wide-angle-loss fast ion detector for a magnetic confinement fusion device, which comprises a double-collimator system and a light path connecting tube, the double-collimator system comprises a collimator front part, a collimator rear part and a scintillator sheet, the collimator front part is provided with a forward collimation front hole and a reverse collimation front hole, and the collimator rear part is provided with a reverse collimation front hole; a forward collimation rear hole and a reverse collimation rear hole are formed in the collimator rear portion, the scintillator sheets are arranged on the side faces of the forward collimator and the reverse collimator, and the length of the forward collimation rear hole and the length of the reverse collimation rear hole and the distance between the forward collimator and the reverse collimator in the y-axis direction are calculated and determined through a detector simulation program. Overlapping of detection areas can be avoided; one end of the light path connecting pipe is fixedly arranged on the double-collimation system, and the other end of the light path connecting pipe is provided with external threads and used for being in threaded connection with a rear-end light path pipeline. According to the method, the track shadow can be reduced under the condition that the wide throwing angle detection range is ensured.

Versatile, multimode radiographic systems and methods utilize portable energy emitters and radiation-tracking detectors. The x-ray emitter may include a digital camera and, optionally, a thermal imaging camera to provide for fluoroscopic, digital, and infrared thermal imagery of a patient for the purpose of aiding diagnostic, surgical, and non-surgical interventions. The emitter may cooperative with an inventive x-ray capture stage that automatically pivots, orients and aligns itself with the emitter to maximize exposure quality and safety. The combined system uses less power, corrects for any skew or perspective in the emission, allows the subject to remain in place, and allows the surgeon's workflow to continue uninterrupted.

To collimate an atomic beam by using laser beams, without requiring high-precision parallel arrangement of the laser beams.SOLUTION: An atomic beam 110 is subjected to quantum collimation. The atomic beam 110 is irradiated with a pumped laser beam 701a and a filtering laser beam 701b in this order. The pumped laser beam 701a has a wavelength corresponding to transition between a ground state and an excited state of an atom contained in the atomic beam 110. The atom is transitioned from the ground state to the excited state, and further, the atom is relaxed from the excited state to a metastable state, according to irradiation of the pumped laser beam 701a. The filtering laser beam 701b has a wavelength corresponding to transition between the ground state and the metastable state. According to irradiation of the filtering laser beam 701b, an atom of the metastable state having a velocity component that is the same as a prescribed velocity component Δv or smaller than Δv, in a travel direction of the filtering laser beam 701b, is transitioned to the ground state.SELECTED DRAWING: Figure 2

The utility model discloses a collimation system of neutron nondestructive testing equipment, and aims to overcome the defects of poor shielding effect on neutron beams and poor scattering limiting effect on neutrons in the conventional collimation system. The utility model comprises: a first collimation body; a plurality of shielding layers are stacked on the first collimation body and the second collimation body to form a multi-layer structure; the neutron channel penetrates through the first collimation body and the second collimation body; one end of the neutron channel is an incident end, the other end of the neutron channel is an emergent end, a first reflecting layer is arranged on the inner wall of the neutron channel, and the first reflecting layer extends from the emergent end to the incident end. According to the collimation system of the neutron nondestructive testing equipment, the shielding effect on neutron beams is improved, neutron scattering is limited, and influences on the environment and personnel of a nondestructive testing site are avoided.

The invention relates to a method for determining an X-ray image dataset of a target region of an object to be examined, wherein projection images showing the target region are captured by means of an X-ray detector and the X-ray image dataset is reconstructed from the projection images, wherein a first portion of the projection images is captured so as to be collimated onto the target region by the target region being irradiated with X-ray radiation by means of an X-ray device through at least one main radiation opening of a collimator assembly. The invention also relates to a corresponding apparatus for determining an X-ray image dataset of a target region of the object to be examined. The invention generally relates to the field of medical X-ray imaging, in particular with the aim of acquiring projections for reconstructing 2D computed-tomography images.

An electromagnetic radiation collimator comprising: a radiopaque elongated housing having a first end and a second end, wherein the housing houses an array of parallel radiolucent beam paths, wherein each of the beam paths extend from the first end to the second end, wherein each of the beam paths has an entrance aperture at the first end, and an exit aperture at the second end; the entrance aperture through which source electromagnetic radiation passes into the beam paths, wherein the beam paths emits an electromagnetic radiation beam from the exit aperture when the source electromagnetic radiation beams are in line with the longitudinal axis of the beam path or having a predetermined angle of deviation from the longitudinal axis of the beam path.

The invention discloses a beam capturing device for reducing neutron back scattering background and a neutron source system.The beam capturing device comprises an internal high-density polyethylene layer, an external lead layer, an external high-density polyethylene layer and an external steel layer which are sequentially arranged from inside to outside, and the internal high-density polyethylene layer is of a hollow structure; a first through hole is formed in the side wall of the outer steel layer, a second through hole is formed in the side wall of the outer high-density polyethylene layer, a third through hole and a fourth through hole are formed in the top of the outer lead layer, and the first through hole, the second through hole, the third through hole and a center through hole of the inner high-density polyethylene layer are sequentially communicated to form a beam channel. A B4C absorption layer is arranged in the fourth through hole, the B4C absorption layer directly faces the beam channel, an internal lead layer is arranged on the face, directly facing the beam channel, of the B4C absorption layer, and effective shielding can be achieved through the device and the neutron source system.

An x-ray imaging apparatus includes a holdable housing; an x-ray source mounted within the housing and configured to output a fan beam of x-rays; and a hoop chopper wheel rotatably mounted within the housing and comprising an x-ray attenuating material configured to block x-rays of the fan beam. The hoop chopper wheel defines a set of beam apertures of which each aperture is configured to pass therethrough a corresponding angular portion of x-rays from the fan beam, so that rotation of the hoop chopper wheel causes scanning of the corresponding angular portion of x-rays. The x-ray source may be a transmission-type x-ray tube configured to output the fan beam centered in an x-ray extraction direction forming an angle greater than 0 degrees with respect to a longitudinal axis of the x-ray tube.

An exemplary embodiment of the present disclosure provides a chip-scale atomic beam system comprising an atomic vapor source, a plurality of channels, and a propagation chamber. The atomic vapor source chamber can comprise an atomic vapor source configured to emit an atomic vapor. The plurality of channels can have first ends and second ends. The first ends can be in fluid communication with the atomic vapor source chamber. The plurality of channels can be configured to collimate the atomic vapor as it moves through the plurality of channels from the first ends to the second ends. The propagation chamber can be in fluid communication with the second ends of the plurality of channels. The propagation chamber can have an internal pressure less than an internal pressure of the atomic vapor source chamber to enable the collimated atomic vapor to propagate through the propagation chamber.

An MLC is provided, the MLC includes: a plurality of leaves; first driving mechanisms connected to the leaves and configured to drive the leaves to move to form a radiation field; and at least one leaf head mechanism mounted on at least one corresponding leaf of the leaves and configured to adjust the radiation field.

Various systems and methods are provided for a system and a computer-implemented method to dynamically configure a collimator aperture of a CT imaging system. The system may be provided to dynamically configure a collimator aperture over a slice coverage of a CT imaging system. The system may, further, provide a processor programmed to select an X-ray dose efficiency based on one or more parameters and dynamically configure a collimator aperture of the system within a reliability range of a calibration curve based on the selected X-ray dose efficiency and flux measured by the X-ray detector.

An X-ray irradiation apparatus (100) comprises an X-ray source device (110) for creating X-rays (2) with a polychromatic spectrum and an X-ray optic device (120) with a beam axis (3) that is longitudinal, wherein the X-ray optic device (120) comprises a reflector device (121) that is polycrystalline having a reflector geometry, a reflector mosaicity and a reflector thickness and the reflector device (121) is arranged for receiving a portion of the X-rays (2) within an acceptance angle of the reflector device (121) and for creating an X-ray beam (4) by Bragg reflection, which is directed along the beam axis (3) towards a focal position thereof and has a spectral distribution determined by the polychromatic spectrum of the X-rays (2), the reflector geometry, the reflector mosaicity and the reflector thickness, and wherein the X-ray irradiation apparatus (100) further comprises a spectral filter aperture device (122) that is arranged downstream from the reflector device (121) for creating a filter gap (123) transmitting a first spectral portion (4A) of the spectral distribution of the X-ray beam (4) and blocking a second spectral portion (4B) and a third spectral portion (4C) of this spectral distribution, wherein the first spectral portion (4A) has higher energies than the second spectral portion (4B) and lower energies than the third spectral portion (4C), wherein the reflector device (121) has an acceptance solid-angle of at least 100 micro-steradian, and wherein the reflector geometry, the reflector mosaicity, the reflector thickness and the acceptance angle of the reflector device (121) are selected such that simultaneously a radiation flux in the first spectral portion (4A) is at least 1% of an incoming flux of the same spectral portion of the X-rays (2) received by the reflector device (121) with a peak reflectivity of at least 1%, the first spectral portion (4A) has a spectral bandwidth of at most 15%, the second and third spectral portions (4B, 4C) have a flux reduced by at least three orders of magnitude compared with the flux in the first spectral portion (4A), and the X-ray beam (4) has a focal spot size of less than 1.5 mm in both transverse dimensions relative to the longitudinal beam axis. Furthermore, an X-ray fluorescence imaging apparatus (200) and a method of using the X-ray irradiation apparatus (100) are described.

The invention discloses a composite shielding collimator suitable for a complex mixed radiation field, belongs to the technical field of radiation shielding and measurement, and mainly solves the problems of low signal-to-noise ratio, high space background and mixed energy spectrum caused by the mixed radiation field of high-energy neutrons, gamma rays and the like in a fusion device and the problem that traditional equipment is heavy and difficult to flexibly adjust. The composite shielding collimator adopts a cylindrical shielding structure formed by aluminum oxide, boron-containing polyethylene, boron carbide and lead from outside to inside, and background interference and secondary radiation are remarkably inhibited by moderating and absorbing neutrons step by step and effectively shielding gamma rays; the neutron and gamma ray detector is integrally integrated on a rotatable supporting mechanism, unification of excellent radiation shielding performance and detection flexibility is achieved, and the neutron and gamma ray detector is mainly used for high-precision neutron and gamma ray diagnosis in complex radiation environments such as a magnetic confinement fusion device.

An electron applicator, which is used along with a linear accelerator in a FLASH radiotherapy treatment program, includes an integrated dosimeter for accurately measuring the FLASH radiation levels, and an interchangeable high-density polymer cutout which can be easily, inexpensively, and accurately formed to match the irregular shape of a tumor.

A mount for an array of leaf drive units corresponding to a single leaf bank of a multi-leaf collimator comprises a plurality of separable mounting plates. Each mounting plate comprises an array of mounting holes, and each mounting hole is arranged to receive a respective one of the leaf drive units.

The present specification discloses a multi-view X-ray inspection system having, in one of several embodiments, a three-view configuration with three X-ray sources. Each X-ray source rotates and is configured to emit a rotating X-ray pencil beam and at least two detector arrays, where each detector array has multiple non-pixellated detectors such that at least a portion of the non-pixellated detectors are oriented toward both the two X-ray sources.

An atomic beam is quantum-mechanically collimated. The atomic beam is irradiated with a pumping laser beam and a filtering laser beam in this order. The pumping laser beam has a wavelength corresponding to a transition between a ground state and an excited state of atoms in the atomic beam. Irradiation with the pumping laser beam causes atoms to make transition from the ground state to the excited state and further relax from the excited state to a metastable state. The filtering laser beam has a wavelength corresponding to a transition between the ground state and the metastable state. By irradiating the filtering laser beam, atoms in the metastable state having velocity components equal to or smaller than a predetermined velocity component Δv in a traveling direction of the filtering laser beam are caused to make transition to the ground state.

The invention discloses a translational photon optical shutter device capable of being combined with multiple inserts, and the device is characterized in that the device comprises an optical shutter switching assembly, a vacuum chamber, a driving mechanism, and a hinge assembly; the optical shutter switching assembly and the hinge assembly are installed in the vacuum chamber, and the driving mechanism is located outside the vacuum chamber. The driving mechanism drives the optical shutter switching assembly to do reciprocating translation through the hinge assembly and is used for switching control over light passing and light blocking of synchrotron radiation light. An absorber is arranged in the optical shutter switching assembly, the top of the absorber is a light receiving face, and the light receiving face comprises a plurality of inclined faces which are obliquely upward in the incidence direction of synchrotron radiation light and used for blocking the synchrotron radiation light generated by various insertion pieces at the same time. The design of the multi-inclined-plane absorber can block synchrotron radiation light generated by various inserts at the same time, so that the valuable axial space occupied by the device in a light beam line is effectively shortened, and a solid technical basis is provided for the design and layout optimization of the light beam line combined by multiple inserts.

The collimator (3) for a radiological equipment (1) comprises shielding means (6, 7, 9, 10, 11) made of tungsten-based radiation-absorbent plastic material; such means may be proximal radiated field closure elements and / or radiated field propagation elements; such means comprise at least one radiated radiogenic field propagation element (6).

A linear accelerator in data communication with a computing device and a programmable logic controller and including a magnetron, an electron gun that is configured to direct an accelerated beam of el

The invention relates to an X-beam collimator for a crystal diffraction experiment. A main body of the X-beam collimator is of a stepped structure comprising an upper end thin part and a lower end thick part; the fixing hole is formed in the upper end thin part of the main body and is fixedly connected with an external driving motor to drive the main body to move; the loading hole is formed in the thick part of the lower end of the main body and is a cylindrical blind hole; the light beam control piece is of a cylindrical structure and is made of platinum iridium alloy, a small round hole is formed in the center of the light beam control piece, and the light beam control piece is installed in the loading hole in a matched mode. The light-transmitting hole is formed in the bottom of the loading hole, the axis of the light-transmitting hole is collinear with the light path axis of the coaxial microscope and the diffractometer, and the light-transmitting hole is used for allowing the X beams screened by the small hole to pass through. The fixing holes are fixedly connected with the motor, so that the motor can drive the main body to move; light beam control sheets with different light beam size control capabilities are loaded through the loading holes; the X-ray beam passes through the collimator through the light hole, the structure is simple, the size and the mass are small, and rapid collimation and size control of the X-ray beam can be achieved.

One exemplary adjustable collimator includes a housing having an aperture through which radiation is directed from an entrance to an exit of the housing, a first shutter 206 and a second shutter 208 within the housing, a first link 222 coupled to the first shutter, and a first yoke 218 coupled to the housing at a pivot point (at 220) and configured to pivot relative to the housing. The first yoke is configured to reduce the effective width of the aperture by moving the first shutter toward the second shutter via the first link when the first yoke is rotated in a first direction (here, clockwise).

The invention relates to a device for receiving a beam path assembly for X-ray radiation, the device having a base plate through which a through-hole for X-ray radiation passes, and a sheet metal part having a base part and a cover, the base part extending in a plane in the base plane of the sheet metal part, the sheet metal part being curved, and the cover being arranged in the base plane of the sheet metal part. The sheet metal part is fixed relative to the base plate by mutual pressing of the base and the plane of the base plate such that the cover shields the ambient region of the base plate against scattered beams of X-ray radiation directed from the edge region of the through-hole to the ambient region of the base plate.

The utility model relates to a depth aperture (1) for delimiting an X-ray beam (11) of a medical X-ray system (16), the depth aperture (1) is provided with an aperture housing (14), the aperture housing (14) is provided with an upper aperture plate (2) for delimiting the X-ray beam (11) close to a focus and a lower aperture plate (4) for delimiting the X-ray beam (11) close to a detector, a light unit for emitting visible light is formed, the light unit being arranged in such a way that the visible light enters the interior of the aperture housing (14) at least partially through a recess in the aperture housing, the recess being sealed substantially impermeable to X-ray radiation by means of a lead glass element (5). The utility model also relates to an X-ray system (16) with the depth aperture.