37 results about "Radiation quality" patented technology

A multi X-ray generating apparatus which has a plurality of electron sources arranged two-dimensionally and targets arranged at positions opposite to the electron sources includes a multi electron source which includes a plurality of electron sources and outputs electrons from driven electron sources by selectively driving a plurality of electron sources in accordance with supplied driving signals, and a target unit which includes a plurality of targets which generate X-rays in accordance with irradiation of electrons output from the multi electron source and outputs X-rays with different radiation qualities in accordance with the generation locations of X-rays. The generation locations and radiation qualities of X-rays from the target unit are controlled by selectively driving the electron sources of the multi electron source.

A radiation generating unit of the present invention includes an electron beam source that emits an electron beam and can change the size of a region to be irradiated with the electron beam on a target while maintaining constant the center position of the region to be irradiated with the electron beam. Furthermore, a target is adopted where the number of types of target layers included in the region to be irradiated with the electron beam can be changed by changing the size of the region to be irradiated with the electron beam. The radiation quality can be switched without changing the radiation focus, and the radiation quality of a high energy radiation can be largely changed.

The energy subtraction apparatus of the present invention comprises an image input device which inputs two or more different kinds of radiographic images having been taken by irradiating a subject with radiation rays with different radiation qualities, an information of body part acquisition device which designates a information of body part, a motion compensation processing device which performs a registration process by compensating for shift between corresponding points between the two or more different kinds of radiographic images due to movement of the subject, a subtraction device which performs an energy subtraction process on the two or more different kinds of radiographic images, and an operation mode switching device which switches an operation mode of the registration process at the motion compensation processing device depending on the information of body part.

An optical nanoantenna ground plane apparatus and method which enhances electric field intensity, surface-enhanced Raman spectroscopy (scattering). A dielectric spacer layer is disposed between a nanoantenna layer and a metallic ground plane layer. Thickness of the dielectric spacer layer is determined in response to matching metal loss resistance and radiation resistance of the optical nanoantenna layer for a given optical antenna configuration and operating wavelength, such as in response to finite difference time domain (FDTD) simulations which determine dielectric spacer layer thickness when radiation quality factor and absorption quality factor are equal. The inventive ground plane can be implemented for a wide range of optical applications regardless of whether fabrication of the nanoantenna-groundplane combination is fabricated in a top-down or bottom-up sequence.

Method and arrangement for implementing a system (10) for providing multi-angular SPECT radiation sampling utilizing slant-angle collimation. The system (10) includes a collimator (13) positioned between a radiating mass (19) within a patient (60) and a radiation detector (21). The collimator (13) is spaced apart from a translational path (25) of the radiating mass (19) at a predefined distance (24). A plurality of apertures (27) extend through the collimator (13) and each forms a passageway (28) for radiation rays (20) emanating from the radiating mass (19) in a direction substantially aligned with a longitudinal axis (29) of the respective passageway (29) and in this manner enables the aligned radiation rays (20) to strike the radiation detector (21). The plurality of passageways (28) include a first group (30) of passageways adjacently aligned in a first row (32) and arranged so that the longitudinal axes (29) of the first group (30) of passageways (32) are substantially contained in a first plane (34) oriented substantially perpendicularly to a central plane (16) of the collimator (13). Each of the parallel longitudinal axes (29) of the first row (32) of passageways are obliquely oriented with respect to the central plane (16) of the collimator (13) with an included angle (36) therebetween. Each of the included angles, when measured clockwise from the central plane (16) or face of the collimator (13) to a respective longitudinal axis, is an acute angle.

The invention discloses a parameter setting and adjusting method applied to a stereo mapping camera. The method comprises the following steps: searching a stereoimaging model of a three-line-array mapping camera, providing the differences of the pupil-entrance radiances when three cameras are used for imaging the same target under different imaging conditions according to mounting modes and satellite orbit parameters of different cameras, and providing the output response differences of the three cameras in combination with the camera actual response degree and the differences of in-orbit integral time so as to adjust the other two cameras in real time by setting an imaging parameter of one camera (an envisage camera). The dynamic matching setting of the camera imaging parameter under different latitudes is provided, and the radiation quality of a stereo image is improved.

The invention belongs to the technical field of X-ray imaging, and discloses a method for determining the X-ray imaging dosage according to a thickness value. The method comprises the following stepsthat S1, a body type measurement system acquires a body type thickness measurement value of a patient, and transmits the measurement value to a processor; S2, the processor looks up an exposure parameter needed by an X-ray generator corresponding to the body type thickness measurement value of the patient in an EI standard range table, and transmits the exposure parameter to the X-ray generator; S3, the X-ray generator sends out X-rays with the corresponding radiation quality within the specified time; and S4, a flat panel detector receives the X-rays with the suitable radiation quality, and then the clear and accurate imaging is realized. According to the method, through the in-depth ranging technology, the body type thickness data of the patient is acquired, the corresponding exposure parameter is acquired through the 'E1 standard range table', and the X-ray generator is guided to emit the X-rays with the corresponding radiation quality. The invention provides the method which can automatically and accurately acquire the radiation quality of the X-rays needed by the patient to be subjected to shooting at low cost in real time.

The invention relates to a video satellite in-orbit relative radiation calibration method and particularly relates to a video satellite area-array sensor camera in-orbit relative radiation calibration method in a Bayer template imaging mode. The method comprises steps that firstly, a satellite sensor is employed to calibrate a sensor dark current error for a deep space imaging or night sea imaging mode, secondly, a satellite sensor multi-frame sequence is employed to realize high precision gain calibration of a Bayer area-array sensor for special ground object imaging, and lastly, based on a gain calibration coefficient, the Bayer area-array sensor is utilized to carry out positioning and compensation for abnormal detector cells to realize position detection and compensation processing of the abnormal detector cells. The method is advantaged in that a detector cell response inconsistency problem of the video satellite area-array sensor and a sensor in-orbit response time-independent problem are solved, satellite image radiation quality is improved, and in-orbit relative radiation calibration of the video satellite area-array sensor is realized.

The embodiment of the invention provides an antenna assembly, electronic equipment and an antenna control method. The antenna assembly comprises a first antenna structure and a second antenna structure, wherein the first antenna structure and/or the second antenna structure is provided with a matching circuit that comprises a variable capacitor; the capacitance value of the variable capacitor is switched according to working resonant frequency where the first antenna structure and/or the second antenna structure is currently located, so that the resonant frequency of the first antenna structure is different from that of the second antenna structure. According to the assembly, equipment and method provided by the embodiment of the invention, the resonant frequency of the antennas is adjusted by using the variable capacitor, so that the resonant frequency of the antenna is different from that of the other one, the interference between the antennas is reduced, and thus the radiation quality of the antennas is improved.

The embodiment of the invention provides a shell assembly, an antenna assembly, electronic equipment and a manufacturing method. The shell assembly comprises a metal conducting plate, a substrate anda frame arranged on the outer periphery of the substrate, wherein the metal conducting plate is arranged on the outer surface of the frame; the metal conducting plate comprises a first side face and asecond side face, a plurality of through holes are formed in the opposite directions between the first face and the second side face, and first strengthening structures for strengthening the structural strength are arranged on the peripheries of the through holes and are positioned on at least one side edge of the first side face and the second side face; and/or second strengthening structures for strengthening the structural strength are arranged between every two adjacent through holes. Through the embodiment of the invention, the structural strength at the positions of the through holes ina steel sheet antenna can be improved so as to improve the reliability of the antenna structure in the using process, the antenna structure can be placed preferably on the electronic equipment with limited clearance area, so that the radiation quality of the antenna structure is strengthened.

The purpose of the present invention is to reduce energy crosstalk of X-rays generated with different tube voltages. An X-ray CT device comprises: an X-ray tube (5); a high voltage generator (10) which selectively generates first and second tube voltages; a first filter (61a) for radiation quality adjustment which is formed with a substance that has substantially the same atomic number as a contrasting substance; a second filter (61b) for radiation quality adjustment which is formed with a substance that is different from the contrasting substance; a filter switching mechanism (62) for switching between the first and second filters; an X-ray detector (8); a reconstruction unit (42) which reconstructs an image on the basis of projected data from the output of the X-ray detector; and a control unit (12) which controls the high voltage generator and the filter switching mechanism in order to synchronize the switching between the first and second tube voltages and the switching between the first and second filters.

The invention discloses a method for identifying human radiation response biomarkers based on various plant genomes. The method comprises the steps that a gene ontology (GO) semantic relationship of aradiation response is retrieved, and annotated genes in various plants and orthologous genes in arabidopsis are obtained; a union set of the orthologous genes in the arabidopsis and a radiation quality specific gene set for each GO semantics of various plants are calculated; by means of protein interaction network analysis, a gene set with protein connectivity greater than a set threshold value is obtained; the occurrence number of genes in the various plants is counted, and a gene set with the gene diversity greater than the set threshold value is obtained; finally, by means of gene homologyanalysis, the orthologous gene set of the genes in human is obtained, and the human radiation response biomarkers are guided. Accordingly, the problem that new human radiation response biomarkers need to be screened by means of plant genomes. The method has the application prospects in the aspects of radiation dose estimation, radiation damage diagnosis and radiation health risk early warning.

The invention discloses a pyramid horn filtering antenna based on a waveguide structure. The filtering antenna has a filtering characteristic and a radiation characteristic at the same time, wherein the filtering characteristic is generated by four rectangular resonant cavities, and the radiation characteristic is generated by the last stage of resonant cavity and a pyramid horn together. The coupling strength between the adjacent resonant cavities, the external quality factor of a filter and the radiation quality factor of the antenna can be controlled by adjusting the width of an inductance diaphragm window. When the external quality factor of the filter is equal to the radiation quality factor of the antenna, mutual influence of a filtering unit and a radiation unit can be avoided. By introducing the pyramid horn, the radiation gain and directionality of the antenna can be improved, and the minor lobe is reduced. The filtering antenna provided by the invention has the advantages of gain flatness, high selectivity, low minor lobe, low cross polarization, simple and reliable structure and easiness integration, and is applicable to various communication systems.

The invention discloses a server fan support. The support comprises front and back support bodies, the front and back support bodies are connected via a connecting piece, each of the front and back support bodies is provided with air vents, and the upper and lower portions of the front support body are provided with upper and lower wire outlets respectively. The fan support is designed in a cabinet, a fan terminal is fixed to ensure that the fan terminal is electrified safely, via special structural processing, the fan terminal is easy to plug and maintain, it is ensured that the fan support can adapt to both a 2U frame type server and a 4U frame type server, on the premise that the heat radiation quality of the server is ensured, the cabinets share a fan support module, the heat maintenance requirement of the fan is satisfied when the 2U and 4U server fans have fault and cannot be used normally, and the cost of server is reduced.

A disk braking device for a motorcycle ensures radiation quality of a disk plate and reduces friction member abrasion of a friction member. A plurality of through-holes are formed in the disk plate and a plurality of notches are formed at peripheral edges of the disk plate. The through-holes are arranged so that one of the through-holes or less is disposed on a radial line extending from the center of the disk plate.

The invention discloses a remote sensing image automatic color uniformizing method based on a global color feature library. The method comprises the following steps: S1, constructing a multi-scale space color library: respectively counting mean values and variances of multi-source remote sensing images with real ground object colors and good radiation quality on different block scales, and establishing a multi-scale space color feature library covering a global range in combination with ground object textures and spectral features; and S2, locally updating the space color library according tospecific color uniformizing requirements; and S3, carrying out automatic color uniformizing processing on the remote sensing image based on a space color library and a wallis filter. The invention hasthe beneficial effects that the invention provides an automatic color uniformizing technology based on a multi-scale space color library, the workload of manufacturing a color uniformizing template in large-scale remote sensing image production is effectively avoided, and the color uniformizing requirements of the interior of a single image, the multiple images and large-range mosaic images are met at the same time; multi-scale statistical information is beneficial to meeting color consistency processing of images with different data sources and different resolutions.

The invention discloses an aerial hyperspectral multi-flight-strip image radiation distortion correction method and relates to the technical field of hyperspectral data radiation correction and application. The method is used for correcting a radiation distortion phenomenon generated between multi-flight-strip images caused by factors such as observation angles and light conditions; on the basis of traditional radiation correction, not only the radiation distortion caused by a sensor is corrected, but also a conversion coefficient of the radiation correction under a specific observation condition is obtained through the relation between a phase angle and a radiance value; according to the conversion coefficient, the radiation distortion data caused by the influence of the observation angle, the atmosphere and the illumination condition are corrected, thereby effectively improving the radiation quality of the aerial hyperspectral data. In addition, the method in the invention can carryout radiation distortion correction on the multi-flight-strip aviation data, thereby realizing seamless mosaic of large-area images and providing high-precision data for later quantitative application.

The invention discloses a space-spectrum information combined satelliteborne hyperspectral image segmentation and clustering method, which comprises the following steps of: preprocessing an acquired satelliteborne hyperspectral image, and removing a wave band with a serious radiation quality problem and a wave band with a serious atmospheric absorption influence to obtain a reflectivity image; judging the complexity level of the image, and determining segmentation parameters according to the complexity level; selecting part of wave bands or all wave bands in the reflectivity image to carry out principal component transformation, retaining the first N principal components after transformation, and carrying out normalization processing; performing spatial dimension filtering processing on the image; principal component transformation is carried out on the reflectivity image after spatial dimension filtering, and the first N principal components after transformation are reserved and normalized; obtaining an initial pattern spot segmentation result and a pattern spot adjacency relation graph based on seed point region growth and image initial segmentation of SAD; splitting and combining the pattern spots; and calculating spectrum and texture features of the pattern spots, constructing a pattern spot spatial spectrum feature set, and clustering the pattern spots by using a K-means method to obtain an image clustering result image.

High intensity x-ray radiation therapy is used in the medical industry to treat tumors. Patients typically receive radiation treatment over a period of time, in which a quality assurance test of the x-ray beam is performed before each treatment. These quality assurance tests are performed by a detection device that receives the x-ray beam and measures the intensity, shape and uniformity of the x-ray beam. The integrated patient positioning and radiation quality assurance system includes recess assemblies into which an x-ray detection device is inserted to fix the location of the x-ray detection device on the board. As a result, the accuracy of the quality assurance test is improved and the set up time is reduced.

The invention provides a radiation quality detection method and system for a multi-source satellite remote sensing image product, and relates to the field of remote sensing image quality detection. The method comprises the following steps: firstly, acquiring a multi-source satellite remote sensing image to obtain original image information; and then geometric accuracy correction processing is carried out on the original image information to obtain geometric accuracy corrected image information. And carrying out atmospheric correction processing on the geometric accuracy correction image information to obtain atmospheric correction processing image information. And carrying out image enhancement processing on the atmospheric correction processing image information to obtain enhanced processing image information. And finally, performing radiation quality inspection on the enhanced image information to obtain a radiation quality inspection result. Through the method provided by the invention, the radiation quality of the multi-source satellite remote sensing image product can be accurately and effectively detected.