30results about How to "Reduce radiation dose" patented technology

This invention relates to the fields of brachytherapy and radiosensitization, specifically providing a... 125 I-nano implantable particles, their preparation methods, and applications. 125 The 1-nanometer implanted particles have a core-shell structure, consisting of a particle core and particles adsorbed on the outer surface of the particle core. 125 I and the particles encapsulated in the nucleus and 125 The outer shell of the I-type photosensitizer is a covalent organic framework. This invention... 125 The core of the I-nanometer implanted particle is used to enhance the energy deposition of gamma rays and X-rays, generating more hydroxyl radicals; the shell containing a type I photosensitizer is used to absorb the energy of Auger electrons and internal conversion electrons and excite the photosensitizer to generate singlet oxygen, effectively improving the response to... 125 The efficiency of I decay energy utilization. 125 I-nano implanted particles, combined with internal radiation therapy and radiodynamic therapy, destroy tumor cell DNA and cell membranes, enhance tumor killing and induce immunogenic cell death, thereby activating anti-tumor immunity and inducing remote effects.

The invention belongs to the field of X-ray long-afterglow luminescent materials. The technical problems that traditional Pr < 3 + > doped fluoride is insufficient in afterglow performance, X-ray imaging depends on continuous irradiation, and color scattering noisy points exist are solved. The NaLuF4: Mg / Cs / Pr fluoride material is prepared by adopting a Cs < + >-Mg < 2 + > co-doping regulation strategy, the material is synthesized by an oleic acid-octadecene liquid phase method, and the X-ray excitation afterglow intensity of Pr < 3 + > is improved by about 110 times by utilizing the synergistic effect that Cs < + > enhances X-ray absorption and Mg < 2 + > optimizes a carrier shallow-deep trap level; the material is prepared into the high-light-transmittance rare earth nano flexible scintillation screen with the resolution ratio of 20.01 lp / mm. According to the invention, zero-noisy-point time-delay imaging after low-dose X-ray transient irradiation is realized, continuous irradiation is not needed, the radiation dose is lower, and the method is mainly applied to the field of X-ray time-delay imaging of low-dose medical diagnosis and industrial nondestructive testing. The method does not need continuous X-ray irradiation, and has important application value in the fields of medical diagnosis, industrial nondestructive testing and the like.

This invention discloses a method and system for predicting kidney stone hardness based on cross-modal aligned knowledge distillation, comprising: training a teacher network using multi-channel DECT data, enabling the teacher network to predict stone hardness and extract the physical attribute vector Φ. DECT ;Φ DECT The dimension is d p Each dimension corresponds to a physical attribute that plays a decisive role in hardness prediction; a student network is constructed, which, after receiving a single-channel SECT image, first generates a latent physical attribute vector and then performs hardness prediction based on the latent physical attribute vector; an alignment loss is constructed, which, during the training of the student model, allows the distribution and geometry of to approximate Φ. DECT The SECT image to be predicted is input into the trained student model to predict the hardness of the kidney stone. This invention can transfer rich information from dual-energy CT to a plain CT model to improve the predictive ability of plain CT for kidney stone hardness.

The utility model is suitable for nuclear power detection field, disclose a kind of device for controlling nuclear power plant phosphate system purification, it include: with the water outlet connection and detect the light transmission detection unit of discharge liquid light transmission, with the light transmission detection unit connection and can switch waterway's first switch valve, with the switch valve connection and for purifying phosphate system discharge liquid's purification unit, with the purification unit connection and for storing the water tank of the liquid purified by the purification unit, with the light transmission detection unit, the control unit of first switch valve electricity connection;Wherein, the first switch valve forms two waterways, the first switch valve, the purification unit and the water tank are formed by pipeline purification waterway;The first switch valve and the water tank are formed by pipeline straight-through waterway.

This invention relates to the field of biomedical technology, and more particularly to a PD-L1-targeting polypeptide, its conjugate, and its applications. The polypeptide possesses the amino acid sequence shown in SEQ ID NO.1 or SEQ ID NO.2. This invention de novo designs a high-affinity PD-L1-targeting specific polypeptide. This polypeptide achieves extremely high affinity with the extracellular domain of the PD-L1 protein through its unique spatial conformation, exhibiting excellent targeting and recognition capabilities. The polypeptide provided by this invention can be conjugated with various modified molecules, such as radionuclides, and the constructed molecular imaging probe exhibits excellent tumor tissue targeting and enrichment capabilities, superior biocompatibility, and clear imaging contrast, enabling specific recognition of PD-L1-positive tumor lesions. It can be applied to clinical scenarios such as early precision diagnosis of tumors, screening of patients for immunotherapy, real-time monitoring of efficacy, and prognostic assessment, possessing significant translational medical value and broad application prospects.

This invention discloses a lithotripsy system combining optical and inertial motion capture, belonging to the field of stone fragmentation technology. It incorporates an ultrasonic device and several optical motion capture devices within the diagnostic chamber. A computer establishes a spatial coordinate system based on information obtained from the optical motion capture devices. The ultrasonic device is equipped with both an inertial and optical motion capture system. The ultrasonic imaging device can detect the distance from the ultrasonic probe to the stone. Both the inertial and optical motion capture systems capture the position of the ultrasonic probe in space and feed the captured data back to the computer in real time. The computer then inputs the known distance from the ultrasonic probe to the stone and calculates the spatial position information of the stone, i.e., the stone's spatial coordinates.

This invention discloses a method and apparatus for quick-change of electro-hydraulic tool heads for nuclear facility decommissioning robots, relating to the field of nuclear facility decommissioning technology. The apparatus includes a tool head connection assembly, a quick-change adapter assembly, a rotating assembly, and a robot connection assembly. The tool head connection assembly is used to mount the tool head. The quick-change adapter assembly is detachably connected to the tool head connection assembly and connects the tool head to the nuclear facility decommissioning robot's electrical and hydraulic circuits, and is connected to the robot connection assembly via the rotating assembly. The robot connection assembly is used to mount the nuclear facility decommissioning robot. This invention addresses the radioactive environment of nuclear facility decommissioning by providing a fast, safe, and efficient tool head replacement mechanism, reducing the working time of personnel in radioactive areas, lowering the radiation dose received by personnel, and significantly improving the operational performance and safety of nuclear facility decommissioning robots.

The utility model relates to the technical field of medical treatment, in particular to a breast cancer proton treatment body position fixing device which is detachably installed on a treatment bed and comprises a body bracket used for supporting the body of a patient and arranged on the treatment bed, and a headrest is installed on the body bracket; the angle adjusting mechanism is mounted on the treatment bed, connected with the body bracket and used for adjusting the placement angle of the body bracket relative to the treatment bed; the two arm brackets are symmetrically arranged on the two sides of the body bracket, the arm brackets are connected with multi-direction adjusting mechanisms installed at the side ends of the body bracket, and the multi-direction adjusting mechanisms are used for adjusting the vertical position and the horizontal position of the arm brackets. The arranged multi-direction adjusting mechanism can adjust the position of the arm bracket in the vertical direction and the horizontal direction, the distance between the arm of a patient and a mammary gland treatment area is adaptively increased, the path of a proton beam penetrating through the arm is remarkably reduced, and therefore the radiation dose received by the arm is reduced to the maximum extent.

The invention discloses a visual navigation device for artificial intelligence assisted percutaneous endoscopic lumbar intervertebral disc resection, which belongs to the technical field of medical surgical navigation and comprises an image acquisition and processing module, an intelligent navigation algorithm module and a visual interaction interface module which are in signal connection in sequence, the image acquisition and processing module is used for acquiring medical image original data of a lumbar vertebra part of a patient, outputting segmented anatomical structure data, cooperatively acquiring image data through double devices, realizing accurate image segmentation and three-dimensional reconstruction in combination with a convolutional neural network algorithm, and ensuring the presentation accuracy of an anatomical structure; according to the system, the optimal operation path planning and real-time instrument tracking functions are achieved, the operation path deviation is effectively avoided, the injury risk is reduced, partition display and color identification technologies are adopted in a visual interaction interface, the system is visual and clear, multimode human-computer interaction is supported, the operation process is simplified, the learning and operation time of doctors is shortened, and the operation efficiency is improved.

The invention relates to a push-and-pull trolley for automatic unloading of a spent fuel transportation container and a using method. The push-and-pull trolley comprises a trolley body and a table top arranged on the trolley body. The table top comprises a table plate, and a support rod, a support rod seat, a push rod, an electric cylinder, a support joint, a push rod adapter, a pull rod adapter and a pull rod which are arranged on the table plate; the two supporting rods are arranged on the two symmetrical sides of the table plate, and the supporting rods are contained in the supporting rod bases; the supporting connector is arranged at the end of the supporting rod and used for being fixed to the bottom of a transportation container. The push rod adapter is connected to the end of the electric cylinder, and a flange floating connector is arranged at the end of the push rod adapter and fixed to one end of the push rod. The pull rod adapter is connected to the end of the electric cylinder, and the pull rod is connected to the pull rod adapter. The electric cylinder drives the push rod, the pull rod and the support rod to move back and forth. According to the device, the two actions of pushing and pulling are achieved at the same time, and the integrated operation of discharging and empty basket reloading is achieved.

The invention provides a rigidity-variable CT scanning bed and a rigidity variable method, and relates to the field of medical imaging devices. The variable-rigidity CT scanning bed comprises a liftable scanning bed body, the scanning bed body comprises a bed frame and a bed plate, the bed plate can move in the length direction of the bed frame, and a coil is further arranged on the bed plate; a honeycomb core material is arranged in the bed board, the core material comprises a plurality of holes, electromagnetic rheological fluid is arranged in the holes, and the electromagnetic rheological fluid is located in the range of a magnetic field generated by the coil. By dynamically improving the rigidity, tiny droop of a traditional bed board in the scanning process is restrained, and the problems of geometric distortion artifacts and motion artifacts caused by deformation of the bed board are fundamentally solved.

The utility model relates to the technical field of ray detection, in particular to an aircraft detection system based on a ray scattering technology. The aircraft detection system based on the ray scattering technology comprises a detection device which is provided with a ray detector; the scanning device is provided with a ray source, and the ray source can output rays; the ray source and the ray detector are arranged on a driving device on the same side of the aircraft, the driving device is respectively connected with the detection device and the scanning device, the driving device drives the scanning device or the aircraft to move relatively, and the driving device drives the detection device to move so as to enable the ray detector to collect scattered rays of rays; the control device is in signal connection with the driving device, the scanning device and the detection device; and the user interaction system is in signal connection with the control device, and the user interaction system is used for imaging the rays collected by the ray detector and controlling the movement of the scanning device or the aircraft through the control device.

This application relates to an integrated reactor top structure and system. The integrated reactor top structure includes a pressure vessel top cover, a control rod drive mechanism, a lifting device assembly, a seismic support assembly, a cable assembly, and a flow-guiding baffle assembly. The lifting device assembly includes multiple lifting rods connected to the pressure vessel top cover. The seismic support assembly is located above the pressure vessel top cover and is fixedly connected to the multiple lifting rods. The control rod drive mechanism is installed between the pressure vessel top cover and the seismic support assembly. The cable assembly is supported above the seismic support assembly. The flow-guiding baffle assembly is located below the seismic support assembly and is fixed to the seismic support assembly or the multiple lifting rods, serving to separate the control rod drive mechanism and the cable assembly. This application uses the flow-guiding baffle assembly to prevent the upward flow of hot gas from the lower part of the integrated reactor top structure, thereby reducing the impact of hot gas on the cables, improving cable safety, and ultimately improving the safety and economy of reactor operation.

The application discloses a pipeline internal flaw detection robot, which comprises a shell, a front support rod arranged on the front side of the shell, a rear support rod arranged on the rear side of the shell, a plurality of front supporting legs arranged on the front support rod, a plurality of rear supporting legs arranged on the rear support rod, a driving system arranged in the shell, a front driving mechanism and a rear driving mechanism included in the driving system, the front driving mechanism and the rear driving mechanism being used for driving the front support rod and the rear support rod to move forward and backward respectively, and an ultrasonic detection head arranged on the outer side of the shell. The pipeline internal flaw detection robot can improve the working environment, greatly reduce the labor intensity, greatly reduce the radiation dose, prolong the service life of the equipment and improve the pipeline flaw detection efficiency.

The invention discloses a solid waste pretreatment system for a radioactive waste incineration process. The solid waste pretreatment system comprises a waste barrel receiving device, a barrel lifting and dumping device, a primary crushing device, an iron metal sorting device, a fine crushing device, a vortex sorting device, a winnowing device and an automatic packaging device. The waste bin receiving device is used for receiving a waste bin filled with nuclear power waste; the barrel lifting and dumping device is used for dumping the barreled waste into the primary crushing device; the primary crushing device is used for primarily crushing and scattering the waste; the iron metal sorting device is used for sorting out ferromagnetic waste in the waste for resource utilization; the fine crushing device is used for performing fine crushing on the iron-removed waste; the vortex sorting device is used for sorting metal and nonmetal wastes except iron; the winnowing device is used for sorting the non-combustible solid waste with the mass higher than a preset value in the non-metal waste and other waste; and the packaging device is used for bagging and sealing the sorted combustible wastes.

The application discloses a kind of quality control classification methods of intelligent DR image, belong to medical image processing and artificial intelligence technical field.The application solves the problems that existing intelligent DR quality control technology is based on image appearance correlation judgment, cannot trace back the root cause of quality problem, poor cross-device generalization, lack of clinical relevance and insufficient explainability.The application is based on X-ray imaging physical process to construct causal model including device parameter node, imaging process node, image quality node and clinical influence node, determines the type, severity and root cause of image quality problem through causal inference algorithm, and generates quality control classification results and targeted improvement suggestions in combination with clinical correlation evaluation.The application can be used stably without retraining for different brands and models of DR equipment, effectively reduces unnecessary re-shooting, reduces patient radiation dose, and significantly improves the clinical trust and acceptance of AI quality control results.

The application provides a mechanical hand clamp changing tool, which comprises a bottom plate, a vertical plate fixedly connected with the bottom plate, a clamp locking device arranged on a first side of the vertical plate and fixedly connected with the bottom plate, a clamp toe changing device arranged on a second side of the vertical plate and fixedly connected with the bottom plate, a clamp changing device fixedly connected on the surface of the second side of the vertical plate, a mechanical hand sleeve fixing seat dismounting device and a clamp positioning device. The scheme has the advantages of simple structure, simple working principle, increased maintenance space for personnel in the maintenance process, reduced radiation dose of workers in the maintenance process, greatly improved work efficiency, realized continuous and stable operation of the mechanical hand in the radioactive environment and ensured stable operation of the main process system.

The invention relates to the technical field of electric valve operation monitoring, in particular to an electric valve rod thrust evaluation method based on power detection, which comprises the following steps of: 1, measuring a reference curve of the valve rod thrust and the active power of an electric valve actuating mechanism motor along with time change under the condition that the front and back pressure difference of a valve is zero; 2, calculating and recording a reference thrust change rate and a reference power change rate; step 3, when the valve is in a zero pressure difference working condition, measuring a curve A of active power of a motor of the electric valve actuating mechanism along with time change; step 4, when the valve is in a pressure difference working condition, measuring a time-varying curve B of the active power of the motor of the electrically operated valve actuating mechanism; 5, acquiring power change rates of the curve A and the curve B; and 6, calculating to obtain thrust under the zero-pressure-difference working condition and thrust under the pressure-difference working condition. According to the method, normalized remote monitoring of the lubrication state and thrust parameters of the electrically operated valve is achieved, and a traditional operation and maintenance mode depending on periodic field testing is changed fundamentally.

The invention relates to a phantom for mutual registration of an X-ray system and a shape detection instrument and a method. The phantom has X-ray features. The phantom has shape features which are arranged in such a way that registration of the phantom in the coordinate system of the shape detection instrument can be achieved by means of shape detection by the shape detection instrument. The shape features are arranged in such a way that the shape detection instrument can be introduced therein and thereby form a registration shape which extends in all three spatial directions. According to the method, the phantom is positioned in the recording region of the X-ray system. The shape detection instrument is introduced into the shape features of the phantom. The shape of the introduced shape detection instrument is detected by the shape detection instrument, wherein the position of the phantom during detection of the shape of the shape detection instrument corresponds to the position of the phantom during recording of the X-ray recording. Subsequently, the shape detection instrument and the X-ray system are mutually registered by means of the X-ray recording and the detected shape of the shape detection instrument.

The utility model relates to the field of pipeline decontamination, and provides a pipeline weld joint ultrasonic decontamination device which comprises an ultrasonic generator and a control module. The ultrasonic generator is used for being attached to the position, close to a weld joint, of the periphery of the pipeline. And the control module is in communication connection with the ultrasonic generator. According to the scheme, ultrasonic waves are adopted to decontaminate the pipeline weld joints, the structure is simple, operation is convenient, the modular design enables equipment to operate more conveniently, the device can be suitable for complex working conditions such as pipeline weld joint decontamination at the dense positions of pipelines, ultrasonic decontamination can directly act on the interiors of the pipelines, the pipeline weld joint ultrasonic decontamination efficiency is improved, and the pipeline weld joint decontamination efficiency is improved. And the workload and radiation dose of workers are reduced.

This invention proposes a multi-stage impactor aerosol sampler and continuous monitoring system, belonging to the field of radioactive environment monitoring. It addresses the problem of extremely high exposure risks during filter replacement when traditional impactor samplers are applied to high-intensity radioactive environments. It includes a cylindrical sealed tower body containing multiple longitudinally connected aerodynamic separation units. Each separation unit has a radial opening on the tower wall, with the radial openings arranged spirally and staggered along the circumference of the tower body. A drawer-type sampling box includes a shielded drawer box, which can be radially inserted and removed into the radial openings. A bypass channel and sliding valve linkage mechanism, located inside the tower body, includes a bypass branch connected in parallel with the main gas channel, and a sliding valve located at the intersection of the main gas channel and the bypass branch. It is primarily used in the uranium mining field.

The invention discloses a dental X-ray tomography system and method based on an intelligent mechanical arm, and relates to the technical field of medical imaging.The method comprises the steps that a high-precision three-dimensional point cloud model of an oral cavity target area is obtained through structured light three-dimensional scanning; generating a collision-free optimal scanning path sequence and a theoretical pose based on the model; controlling the mechanical arm to carry the X-ray source to move along the optimal path and synchronously triggering exposure and image acquisition; the actual pose and the projected image quality of the tail end of the mechanical arm are monitored in real time, and a double-feedback closed loop is formed; calculating a pose compensation instruction and dynamically adjusting exposure parameters; and executing a three-dimensional iterative reconstruction algorithm by using the accurate geometric parameters to generate a cross-sectional image and three-dimensional body data. According to the invention, self-adaptive scanning track planning, dynamic pose error correction, millisecond-level self-adaptive dose regulation and control and end-to-end full-automatic workflow can be realized, the spatial resolution and geometric fidelity of a reconstructed image are remarkably improved, and the radiation dose of a patient is reduced.

This invention discloses an irradiation-based aseptic treatment device and method, relating to the field of seed aseptic treatment. The device includes a frame, a conveyor belt, and an irradiation assembly. A fixed support is mounted on the outer side of the conveyor belt on the frame, while a reciprocating sliding assembly is installed on the inner side of the conveyor belt. A low-frequency vibration assembly is mounted on top of the reciprocating sliding assembly. A shaped groove is formed on the inner side of the fixed support. A fixed plate is installed inside the reciprocating sliding assembly, and a reflector is mounted on the fixed plate. The conveyor belt is a flat sprocket type. This invention uses the reciprocating sliding assembly to drive the low-frequency vibration assembly to contact and vibrate different areas of the conveyor belt, adjusting the posture of the rice seeds on the conveyor belt. The reflector is adjusted by rotating its angle on the reciprocating sliding assembly, effectively avoiding excessive localized radiation doses and concentrated direct radiation that could cause seed coat burns and embryo damage due to a fixed-angle reflector.

Embodiments of the present application disclose an imaging system. The imaging system comprises a support assembly comprising a detection region for accommodating a subject to be detected; a detector assembly disposed around the detection region for detecting radiation emitted by the subject to be detected when in the detection region; and a processing engine for initializing the detector assembly to activate a portion of the detectors such that the remaining detectors are deactivated.

The application discloses an interventional surgery robot synchronous positioning and three-dimensional map construction method and system. The system comprises a catheter assembly, an ultrasonic sensor and an electromagnetic positioning coil arranged at the front end inside the catheter assembly; an electromagnetic shielding layer is arranged between the ultrasonic sensor and the electromagnetic positioning coil; further comprising a proximal end driving module and an ultrasonic imaging system of the ultrasonic sensor, an electromagnetic positioning system matched with the electromagnetic positioning coil, and a synchronous positioning and mapping system (SLAM) for data processing; the SLAM acquires the 2D image of intravascular ultrasound and the spatial position information of the electromagnetic positioning coil, and performs the synchronous positioning and three-dimensional map construction of the interventional surgery robot. The application effectively combines intravascular ultrasound, an electromagnetic positioning system and a SLAM, can realize the intravascular autonomous positioning and navigation of the vascular interventional surgery robot, improves the navigation and position sensing capability of the robot in the interventional surgery, and effectively improves the accuracy and operation effect of the surgery.

The application provides a dual-energy switching control method for an LCC high-voltage generator. The method is based on the fundamental equivalent frequency domain model of a multiple voltage rectification LCC resonant converter, realizes fast solution of steady-state control parameters, establishes an accurate time domain mathematical model of the resonant cavity parallel capacitor voltage, designs a low-energy to high-energy transient switching control strategy, combines the actual working condition requirements, realizes system steady-state control in a state trajectory and PID combined manner, and rapidly discharges energy in the high-energy to low-energy transient process. The application combines the advantages of time domain control and frequency domain control, forms a composite control strategy suitable for multiple working conditions, can realize rapid dual-energy voltage switching within 100 mu s, ensures good output repeatability and control accuracy, and meets the actual engineering application requirements.

This application provides a tube current modulation method, apparatus, and medium, applicable to the field of imaging equipment technology. The method uses a target image and the segmentation results of the target object within that image. Based on the target image and the segmentation results, it determines the scanning range and scanning center point of a scanning device. Based on the scanning range and center point, it obtains a tube current modulation curve, and then adjusts the scanning current of the scanning device based on this curve. This enables dynamic adjustment of scanning parameters during image guidance, improving the image quality obtained by the scanning device. Furthermore, the target image and the segmentation results of the target object used in this application accurately reflect the cross-sectional structure of the target object. Compared to using a two-dimensional positioning image, it can effectively distinguish the thickness differences of overlapping objects, thereby generating a more accurate tube current modulation curve.

The application discloses a remote taking-out method of a reactor in-line collimator and an auxiliary tool for hoisting the collimator, and the method comprises the following steps: S1, a temporary channel with a preset length is built, and the outlet of the temporary channel is a bending piece; S2, the bending piece is partially inserted into at least one lifting lug of the collimator; S3, a guide core with rigidity and flexibility is connected with a lifting belt, and the end of the guide core away from the lifting belt is put into the inlet of the temporary channel, passes through the bending piece, and simultaneously or sequentially passes through the lifting lug of the collimator; S4, after the guide core passes through the two lifting lugs, the guide core is clamped by using a special clamp, and then the temporary channel is removed; S5, the guide core is driven by the special clamp to completely pass through the two lifting lugs, the lifting belt is driven to pass into the two lifting lugs, and then the guide core is disconnected with the lifting belt; and S6, the lifting belt is connected with a lifting machine, and the collimator is hoisted out by the lifting machine. The application can realize remote taking-out of the collimator in the reactor, and the operation is simple and reliable.

The utility model discloses a mouse heart radioactivity damage mould based on 3D printing and mould turning process, including frame body structure, the whole is hollow cuboid structure without top, the frame body structure is spliced by left and right two connecting pieces, and this kind of structure is convenient for early processing and later storage, support piece is provided with two rows, and two rows of support pieces are symmetrically placed in the two side wall positions of frame body structure, the utility model discloses through 3D modeling calculation radio source under the lead plate barrier, the real data of accurate irradiation mouse heart, the lead plate mould is made based on three -dimensional structure data 3D printing, and accurate mould turning is carried out to low melting point lead through mould turning technology, realize the production of high accuracy, and X ray can accurately penetrate the radiation hole and form the circular irradiation field of 1cm diameter, realize the accurate radiotherapy of heart, and the radiation dose that other parts bear under the protection of 3cm thick lead plate is lower, and the animal mortality is low, and it is closer to the clinical practice.

The present invention relates to an automated radiosynthesis device adapted for enhanced automatic disconnection of a disposable kit once a radiosynthesis has been carried out. The automated radiosynthesis device of the invention therefore reduces the time to remove the disposable kit from the radiosynthesis device and reduces radiation exposure to the operator.