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.

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.

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.

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 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 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 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.