164results about How to "Reduce exposure dose" patented technology

In a medical digital X-ray imaging apparatus having a plurality of imaging modes including computed tomography mode, a supporter supports an X-ray source and a digital X-ray sensor having a two-dimensional detection plane for detecting X-rays, while interposing an object between them. An image reconstructor acquires data from the digital X-ray sensor and reconstructs an image based on the acquired data. An operator selects one of a first imaging mode and a second imaging mode. The second imaging mode has an irradiation field different from the first imaging mode and has an area to be read in the digital X-ray sensor smaller than that in the first imaging mode.

Raw cone beam tomography projection image data are taken from an object and are denoised by a wavelet domain denoising technique and at least one other denoising technique such as a digital reconstruction filter. The denoised projection image data are then reconstructed into the final tomography image using a cone beam reconstruction algorithm, such as Feldkamp's algorithm.

A medical X-ray CT imaging apparatus is capable of performing efficient CT imaging of living organs symmetrically located with respect to a predetermined plane. The medical X-ray CT imaging apparatus comprises an X-ray source (10), an X-ray detection means (20), a supporting means (30), a subject holding means (40), a rotation means (60r), a moving means (60), an imaging region specifying means for specifying imaging regions of a first living organ and a second living organ which are symmetrically located with respect to a predetermined plane, a calculation means which uses the moving means (60) and the rotation means (60r) to automatically and consecutively perform X-ray CT imaging of respective imaging regions of the first living organ and the second living organ, which are specified by the imaging region specifying means, and reconstructs respective CT images of the first living organ and the second living organ on the basis of electrical signals obtained by the X-ray CT imaging, and a display part (88) for displaying the CT images of the first living organ and the second living organ, which are obtained by the calculation means.

A photosensitive resin composition which is excellent in resolution, low in cost, and usable in a wide range of structures of polymer precursors each of which is reacted into a final product by a basic substance or by heating in the presence of a basic substance. The photosensitive resin composition includes a base generator which has a specific structure and generates a base by exposure to electromagnetic radiation and heating, and a polymer precursor which is reacted into a final product by the base generator and by a basic substance or by heating in the presence of a basic substance.

A radiation image generating system having: a radiation image detector to obtain an image information; and a console to control the radiation image detector, wherein the radiation image detector comprises a detector communication unit communicating to the console, and a detector control unit to which a signal from the detector communication unit is inputted, the console comprises a console communication unit communicating to the detector communication unit, a console control unit controlling the console communication unit, and a reporting unit controlled by the console control unit, and after the console control unit controls the console communication unit to transmit a replying instruction signal for instructing a reply to the detector communication unit, the console control unit detects whether there is a replying signal based on the instructing, and when the replying signal is not inputted, the console control unit controls the reporting unit to report that a communication abnormality occurs.

A grid 3 arranged with a scattered radiation shielding plate 31 for each column is arranged at a front face of a radiation detector 2. The distance between the grid 3 and the radiation detector 2 is desirably a integral multiple of the height of the scattered radiation shielding plate 31. A true image signal of the pixel column including the shade is estimated from the image signal of the pixel column adjacent to the pixel column including the shade 41. The scattered radiation distribution is estimated from the image signals of the pixel column including the shade of the scattered radiation shielding plate and the image signals when considering that the shielding plate is not included in the shielded pixel. A clear diagnosis image without influence of scattered radiation is obtained by subtracting the estimated scattered radiation distribution from the estimated image signal distribution.

The invention belongs to the field of a non-destructive testing technology for a nuclear power station and in particular relates to automatic ultrasonic testing equipment for a threaded hole zone of a nuclear reactor pressure vessel. The automatic ultrasonic testing equipment comprises a rack (2), a vertical supporting wheel assembly (7), a driving wheel assembly (10), an encoder assembly (11), a circumferential supporting wheel assembly (12) and a circumferential pushing-against wheel assembly (13), wherein the rack (2) is arranged horizontally, is a main body structure of the automatic ultrasonic testing equipment for the threaded hole zone of the nuclear reactor pressure vessel, and is used for bearing all functional assemblies; and the vertical supporting wheel assembly (7) comprises multiple vertical supporting wheels which are arranged under the rack (2) for supporting the rack (2) in the pressure vessel. The automatic ultrasonic testing equipment is applied to automatic ultrasonic testing on an internal thread of the threaded hole zone of the nuclear reactor pressure vessel, connection zones of bolt holes and connection zones of the bolt holes in the inner side of the pressure vessel barrel, and is also used for nondestructive testing on the position of a flange of the pressure vessel in the other fields or is used for cleaning threaded holes, and the like.

The present invention provides a radiation curing composition comprising (a): a siloxane resin, (b): a photoacid generator or photobase generator, and (c): a solvent capable of dissolving component (a), and (d): a curing acceleration catalyst.

3-D structures which are fabricated by gray-tone exposure of a class of thick negative photo-sensitized epoxy resists from the substrate side of a transparent substrate, using development methods that rely upon a physical distinction between polymerized (solid) and unpolymerized (liquid) photoresist at elevated temperatures Such structures may exhibit smoothly-varying topographic features with thicknesses as great as 2 mm.

A method and device for controlling a medical imaging apparatus are disclosed herein. The device for controlling a medical imaging apparatus includes a processor. The processor controls a medical imaging apparatus to take a plurality of images including a region of interest of a subject, while a C-arm of the medical imaging apparatus rotates from a first rotation angle to a second rotation angle. The processor detects the rotation angle of the C-arm of the medical imaging apparatus corresponding to each of the taken images. The processor stores the detected rotation angle in a database, along with the taken image. The processor extracts a rotation angle, stored along with an image selected as an optimal image from the taken images, as an optimal rotation angle.

The invention discloses a reactor pool parts removing technology for swimming pool reactor decommissioning, comprising the following steps: (1) the water in a reactor pool is discharged to keep the water 1m higher than the top of a bracket in an active area; (2) non-fixed items in the reactor pool are removed and hoisted out for cutting and dismantling; (3) fixed parts inside the reactor pool are cut and dismantled; (4) sediments at the bottom inside the reactor pool are collected and removed; (5) the surface of the reactor pool is decontaminated; and (6) the reactor pool is filled with water and covered with a temporary cover plate. According to the removing technology disclosed by the invention, a remote control demolition robot and a power manipulator work together, and the existing items in a reactor pool with three-meters-deep water can be cleared and demolished safely under remote control. The existing items in a reactor pool can be demolished safely and smoothly, the exposure dose of operators is reduced, and the demolished waste can be handled in a classified way in accordance with relevant radioactive waste management regulations of our country.

The invention belongs to the technology of processing radioactive wastes, and in particular relates to a high-activity spent radioactive source conditioning method and a special device thereof. The method comprises the following steps of: dismantling the original container in a dismountable moving device; taking a high-activity spent radioactive source out of the original hanging basket and encapsulating; putting the encapsulated tube into an encapsulatable container; putting the container into a long-term storage container which can be stored for a long time directly; or taking the container out of the long-term storage container and storing the container in a deep well. The device comprises a device main body, wherein a shielding body is arranged on the device main body and is provided with a mechanical hand and a liquid observation window; a control part of the mechanical hand is arranged outside the device main body; and a lifting device and a welding device are arranged in the device main body. The high-activity spent radioactive source which is conditioned through the method has the characteristics that the source has high volume reduction rate, is retrievable and can be stored in a pit or the deep well. The conditioning device has a modular and dismountable structure and is convenient to move and operate.

In a radiographic image detection apparatus that can perform long-size radiography on a region of a patient that is larger than the detection range of a radiographic image detector, radiography is performed so that a collimator image is included in a radiographic image in such a manner that the collimator image is present in the vicinity of a side edge of the radiographic image. Further, the inclination of each radiographic image caused by inclination of the radiographic image detector at the time of radiography is corrected based on the collimator image. Further, a synthesis image is produced by combining the plurality of radiographic images the inclination of which has been corrected.

A dual-energy X-ray imaging apparatus and a method obtain dual-energy X-ray images by sequentially radiating an X-ray of a first energy and a X-ray of a second energy to an object, with the intensity and the quantity of the second energy adjusted using brightness information of the first energy X-ray image for the object so that a precise X-ray image representing the characteristics of the object is obtained and a precise diagnosis is achieved.

In a radiographic image detection apparatus that can perform long-size radiography on a region of a patient that is larger than the detection range of a radiographic image detector, radiography is performed so that a collimator image is included in a radiographic image in such a manner that the collimator image is present in the vicinity of a side edge of the radiographic image. Further, the inclination of each radiographic image caused by inclination of the radiographic image detector at the time of radiography is corrected based on the collimator image. Further, a synthesis image is produced by combining the plurality of radiographic images the inclination of which has been corrected.

The invention discloses a CT digital subtraction angiography (CT / DSA) imaging system and CT digital subtraction angiography (CT / DSA) imaging method. The CT / DSA imaging system is composed of an x-ray generator, an energy resolution photon counting detector, a CT image reconstruction unit, a digital image subtraction unit, an image storage, transmission and display unit, an examining bed, a machine frame and a controller, wherein an x-ray source generates continuous energy spectrum x rays for fast scanning the human body; the energy resolution photon counting detector is used for detecting the x photons penetrating through the human body and judging and counting the energy of the x photons; the CT image reconstruction unit is used for collecting signals output by the energy resolution photon counting detector, so that two groups of transmission projection data of a high-energy area and a low-energy area are formed, and the projection data of the high-energy area and the projection data of the low-energy area are subjected to tomography image reconstruction by adopting an analytical reconstruction algorithm or a statistical reconstruction algorithm; the digital image subtraction unit is used for applying different weights to the tomography reconstruction images of the high-energy area and the low-energy area of each same scanning position and carrying out subtraction calculation, and thus the CT digital subtraction angiography image is obtained.

A medical X-ray CT imaging apparatus is capable of performing efficient CT imaging of living organs symmetrically located with respect to a predetermined plane. The medical X-ray CT imaging apparatus comprises an X-ray source (10), an X-ray detection means (20), a supporting means (30), a subject holding means (40), a rotation means (60r), a moving means (60), an imaging region specifying means for specifying imaging regions of a first living organ and a second living organ which are symmetrically located with respect to a predetermined plane, a calculation means which uses the moving means (60) and the rotation means (60r) to automatically and consecutively perform X-ray CT imaging of respective imaging regions of the first living organ and the second living organ, which are specified by the imaging region specifying means, and reconstructs respective CT images of the first living organ and the second living organ on the basis of electrical signals obtained by the X-ray CT imaging, and a display part (88) for displaying the CT images of the first living organ and the second living organ, which are obtained by the calculation means.

An x-ray CT image processing method which carries out a statistical estimate in prior knowledge relating to the movement and the x-ray absorption coefficient of a measurement subject comprises: a step of hypothesizing that the measurement subject changes smoothly over time, and defining a first probability model (prior knowledge of the measurement subject over all times) relating to movement and a second probability model (projected image observation model over all times) relating to observation; and a step of carrying out a statistical estimate dependent on both the first probability model and the second probability model. The first probability model relating to the movement of the measurement subject and the second model relating to observation are defined as probability models with which statistical estimates are carried out at the outset, and motion and CT images are simultaneously estimated by carrying out induction based on the probability models.

The ultrasonic diagnosis system capable of tracking blood flow position automatically to obtain the spectral Doppler information has measures of setting one limited monitoring range and obtaining the Doppler information of sampling volumes inside the range. The system compares the Doppler information of the sampling volumes to select one standard sampling volume and regulates the position of the limited monitoring range around the selected sampling volume to realize the automatic tracking of the blood flow. Spectral curve is formed and displayed based on the Doppler information for the calculation of various blood flow parameters. Optimally, the system can display the limited monitoring range and the position of the central sampling volume dynamically in image of mode B or other spatial display mode.

The invention relates to a photon sieve phase contrast objective lens which comprises a photon sieve lens formed by a substrate and a plurality of light-transmitting holes arranged on the substrate, and a phase-changing plate arranged on the surface of the photon sieve lens, wherein the phase-changing plate is positioned at the middle part of the photon sieve lens or on the edge around the photon sieve lens, and the center of the photon sieve lens and the center of the phase-changing plate are positioned on the same axial line. In addition, the invention further provides a manufacturing method of the photon sieve phase contrast objective lens and an imaging method. In the photon sieve phase contrast objective lens, the manufacturing method and the imaging method, the photon sieve lens is adopted for suppressing side lobe and high-order diffraction focus, thereby realizing high imaging resolution and high imaging contrast; and the photon sieve lens and the phase-changing plate are etched on the same substrate, the phase-changing plate is arranged on the surface of the photon sieve lens, and the center of the photon sieve lens and the center of the phase-changing plate are positioned on the same axial line, thereby being capable of realizing precise alignment, simultaneously reducing exposure time and exposure dose and being capable of realizing non-destructive detection with high imaging resolution and high imaging contrast of a minute structure in a weakly absorbing material.

The invention discloses a rapid separation method of activated product gallium in a fission product. The rapid separation method comprises the following steps of: preparation of a gallium-containing radioactive solution, preparation of an eluting solution, filling of a chromatographic separation column, control of flow speed, separation of chromatographic, and the like. The rapid separation method comprises the following specific steps of: carrying out adsorption separation by enabling a radioactive solution which is enriched with the fission product and the activated product gallium to pass through a P2O4 chromatographic column, an Al2O3 chromatographic column and a TBP (Tri-Butyl-Phosphate) extracting chromatographic column at a certain flow speed; washing, desorbing the gallium in the TBP extracting chromatographic column by utilizing a low-acid solution; and further purifying an effluent through an Al2O3 and active carbon mixed column and collecting the purified effluent in a sample bottle to obtain a radioactive measuring solution of the activated product gallium. With the adoption of the rapid separation method disclosed by the invention, the radioactive solution enriched with the fission product and the radioactive solution enriched with the activated product gallium are separated; the recycling rate of the gallium is 80-90%; and the decontamination factor of the fission product is superior to 104 and the separation flow can be finished within 2 hours.

The invention discloses a manufacturing method of an individualized auxiliary device for intracavitary combined parametrial implantation treatment for cervical carcinoma. The individualized auxiliarydevice comprises a vagina member and a graduated disc. The manufacturing method comprises the steps of filling the vagina, and then performing magnetic resonance imaging to obtain the bending degree of a uterine body, the length of a uterine cavity, the length of the vagina, the position of a parametrial tumor, the size of the parametrial tumor and the shape of the parametrial tumor; selecting a uterine cavity source applicator according to the bending degree of the uterine body and the length of the uterine cavity, thus determining the aperture of a first channel, determining the length of acolumn body according to the length of the vagina, and determining the number of second channels, the aperture of each second channel and an angle between each second channel and an axis according tothe position, size and shape of the parametrial tumor; and performing three-dimensional modeling on the vagina member according to the data determined in the above steps; and performing 3D printing onthe vagina member. The therapeutic effect of near-distance treatment for cervical carcinoma is improved. The manufacturing method is applied to the field of medical instruments.

The invention discloses a rectum eccentric four-cavity applicator. The outside diameter of the applicator is between 25 and 35mm; four supplying radiator ducts are inserted into a cavity of an outer tube and parallel to the axes of the outer tube; the four supplying radiator ducts are all deviated to the circle center of the outer tube, and distributed and fixed in the cavity of the outer tube at intervals along a segment of circular arc in the cross section of the outer tube; and circular arcs between two circle centers of adjacent two supplying radiator ducts are equal, and center angles corresponding to the circular arcs are between 45 and 75 DEG. By adopting the eccentric four-cavity applicator, applicators with different diameters can be selected according to the range where tumors intrude rectum and physiological characteristics of a patient; three or four supplying radiator ducts can be freely selected according to sizes of the tumors to apply radioactive sources; and the weighting of two side tubes can be regulated according to the elimination of the tumors, so that the radiated area in a high dose area is reduced, radiation to normal mucous membrane tissues and back wall of a bladder near the tumors in the rectum is reduced, the incidence rate of complicating diseases in early and late radiation is reduced, and the effect of radiation therapy is improved.

The invention discloses computed tomography (CT) equipment, which comprises at least one X-ray tube (110), a detector (120), an image reconstruction device (330), an exposure control device (310) and a data supplementary device (320), wherein the detector (120) is used for receiving X rays from the X-ray tube to generate the original data; the image reconstruction device (330) is used for reconstructing an image based on the original data to acquire a scout view; the exposure control device (310) is used for irradiating an object (200) to be detected intermittently by using the X rays; and the data supplementary device (320) is used for supplementing missed original data when the X rays do not irradiate by using the original data generated by the detector during irradiation of the X rays and providing the supplemented original data for the image reconstruction device (330). The invention also discloses a scout view imaging method. By the equipment and the method, the exposure dose of the X rays received by the object to be detected in the scout view imaging process is reduced.

Problems SolvedThe information solves the problem of how to provide a structure and a manufacturing method that can inexpensively and stably obtain a scattered X-ray eliminating grid wherein air serves as an intermediate substance even as X-ray absorbing substance parts are accurately positioned and held. SolutionThe invention includes disposing guide slit plate mechanisms fixed relative to one another, namely, parallel to and spaced apart from one another by a prescribed distance; fitting metal foils, which serve as X-ray absorbing substance provided between the guide slit plate mechanisms, parallel to primary X-rays; inserting both ends of the metal foils into the guide slit plate mechanisms; inserting, when applying tension evenly, a rod, which is sheathed in an elastic body, into holes formed in the metal foils on the tip sides of the metal foils beyond the inserted portions; and adopting a structure that ensures that the cross sectional shape of the elastic body sheathing the rod has a sufficient wall thickness in a direction in which the elastic body is compressed when tension is generated, and thereby eliminating any difference in the tension even if a spring constant k that is determined during compression is small and the amounts of compression are different.

The invention discloses a retrieving method for low-level waste in a waste pit. The method comprises the steps that waste in a pit opening of the waste pit is gripped to an orthographic projection area under the pit opening of the waste pit through a power manipulator, and then the waste in the orthographic projection area under the pit opening of the waste pit is gripped outside the waste pit and loaded in a waste package box or a transfer container through an electric gripper. According to the retrieving method for the low-level waste in the waste pit, the power manipulator and the electric gripper are combined together according to a certain operation sequence in the operating process, therefore, the technical problem of retrieving the low-level waste in the pit is solved, and imitation and reference value is provided for retirement of other pit type waste libraries in China. Compared with the prior art, the method has the advantages that by adopting a robot gripping mode, the retrieving efficiency of the low-level waste is improved; the exposure dose of operating personnel is decreased, and safety of the operating personnel is guaranteed.

The invention discloses a high-precision radioactive source search positioning system and method based on a civil small unmanned aerial vehicle. The positioning system comprises an unmanned aerial vehicle module and a ground workstation module in wireless communication connection with the unmanned aerial vehicle module, wherein the unmanned aerial vehicle module comprises one or more unmanned aerial vehicles, the unmanned aerial vehicle is provided with a gamma dose rate quick response measuring instrument, a height measurement and obstacle avoidance unit, a high-precision positioning unit, a liquid spraying unit and a remote data transmission and control unit, the gamma dose rate quick response measuring instrument, the height measurement and obstacle avoidance unit, the high-precision positioning unit and the liquid spraying unit are respectively in communication connection with the remote data transmission and control unit; and the ground work station module comprises terminal equipment, and the terminal equipment is in communication connection with the remote data transmission and control unit. The system has the advantages of being good in maneuverability, high in environmental adaptability, good in flight safety, high in source searching sensitivity and accuracy and the like, a warning area can be automatically delimited, and the radiation exposure dose of workers is reduced to the maximum extent.