104 results about "Radiation dose" patented technology

The utility model discloses a CT (computed tomography) device capable of adjusting irradiation measurement according to local weight distribution. The CT device comprises a scanning bed and a scanning device. The scanning bed comprises a bed frame and a bed board, and the bed board is slidably connected to the bed frame and can go deep into and out of the scanning cavity of the scanning device in the Z direction. The bed frame is designed to be of a supporting, lifting and telescopic structure for the bed board. The bed plate comprises a supporting plate and a sensor layer, and the supporting plate is designed to be of a supporting structure of the bed plate and is slidably connected with the bed frame. The sensor layer comprises a base layer, a plurality of pressure sensors and a sensor interface, the base layer is designed as a supporting and insulating structure of the pressure sensors, the plurality of pressure sensors are distributed on the base layer in an array shape, each pressure sensor is connected to the sensor interface through a flat cable, and the flat cable is arranged along the base layer. According to the CT equipment provided by the utility model, the pressure distribution data of the scanned object on the scanning bed is obtained through the pressure sensor arranged on the scanning bed, and the irradiation dose of each scanned fault is optimized according to the weight distribution characteristics.

The application discloses a gelatin-based medical consumable and a sterilization process thereof. The consumable comprises a gelatin main material and a biocompatible auxiliary component. The gelatin is pre-crosslinked to form a three-dimensional network structure, and can be made into a porous sponge, a film, a fiber felt, a particle, a columnar body, a sheet body or a gel block. The sterilization process is used for a pre-crosslinked consumable which has been formed. Radiation sterilization, ethylene oxide sterilization or combined sterilization is adopted. According to the sterilization route, the water content, the packaging atmosphere, the radiation dose, the ethylene oxide concentration and the resolution condition are controlled, so that the sterilization treatment mainly plays a sterilization role and does not damage the gelatin main network. After sterilization, the strength retention rate of the consumable is not less than 85%, the swelling ratio retention rate is not less than 80%, the degradation time change rate is ± 20%, and the gel fraction change rate is not more than 10%.

The application discloses a valve cavity drainage device and method, and relates to the technical field of nuclear power. The device comprises a water pump, a pipeline assembly, a power unit and a control unit. The pipeline assembly comprises a first pipeline and a second pipeline, which are arranged in parallel along a vertical direction and are connected through a bend at the upper end to form a siphon channel between the first pipeline and the second pipeline. The lower end of the first pipeline is a water inlet, and the lower end of the second pipeline is a water outlet connected with the water inlet of the water pump. The power unit is electrically connected with the water pump. The control unit is electrically connected with the water pump and the power unit respectively and is used for controlling the start-stop and rotating speed of the water pump. The device can realize the discharge of nuclear sewage or other highly contaminated liquid, solve the problem of cleaning residual water in the valve cavity and reduce the radiation dose of the operator.

The application provides a kind of nuclear power plant dry storage spent fuel emergency evaluation method, system, equipment and medium, applied to dry nuclear horizontal modular storage system, the dry nuclear horizontal modular storage system includes concrete module and storage container, the method comprises: obtaining the information of natural disaster;According to the type and risk parameter of the natural disaster information of the natural disaster;In response to the risk parameter being higher than the response threshold, the radiation dose of the concrete module is obtained;According to the radiation dose, the effective multiplication coefficient of the storage container is obtained;In response to the effective multiplication coefficient being higher than the effective multiplication coefficient threshold, the storage container transfer operation is executed, can be integrated together by natural disaster risk assessment, radiation dose monitoring and effective multiplication coefficient control, form a complete emergency evaluation and response system, improve the overall efficiency of nuclear power plant in response to disaster.

The application provides a radioactive separation resin life prediction method and system based on machine learning, relates to the technical field of radioactive waste liquid treatment, and the method comprises the following steps: acquiring real-time online monitoring data of a radioactive separation resin in a running process, wherein the real-time online monitoring data comprises local adsorption capacity, local temperature and local radiation dose collected from three point positions, namely, upper, middle and lower positions, of the axial distribution of a resin column; based on the real-time online monitoring data, a microstructure deterioration proxy model is constructed, and a microstructure deterioration quantitative index of the resin under a current working condition is calculated; and the real-time online monitoring data and the microstructure deterioration quantitative index are subjected to feature fusion, and a fusion feature set is constructed. The application guarantees the continuous, stable and safe operation of a radioactive waste liquid treatment and nuclide separation system.

The application discloses a fault scanning control method and device, a fault scanning equipment and a storage medium. The method comprises the following steps: identifying a key anatomical structure of an initial projection image based on a pre-trained trajectory planning model, generating a probability distribution map, determining a sparse scanning angle sequence and corresponding first scanning parameters, densely sampling and appropriately increasing a radiation dose in a high-weight area, and sparsely sampling and reducing a dose in a low-weight area; controlling the fault scanning equipment to perform scanning, obtaining first projection data and reconstructing the first projection data into a sparse reconstruction image; performing multi-modal fusion and scoring on the sparse reconstruction image and the current scanning parameters through an image quality evaluation model, adaptively optimizing scanning instructions according to the probability distribution map, a fusion feature vector, an image quality score, an equipment state and historical action data, generating second scanning parameters, making the scanning trajectory more continuous and smooth through an artificial intelligence technology, and realizing regional adaptive regulation and control of angles, doses and paths, so that the imaging resolution can be improved.

The application discloses a CT dose self-adaptive optimization system and method thereof, and belongs to the technical field of medical images, which comprises a CT scanner, an image data processing workstation, a high-risk population analysis device, a dose parameter self-adaptive optimization device, a dose parameter automatic adjustment device and an intelligent learning unit, and based on the theory of information geometry, the dose parameter optimization problem is promoted from the Euclidean space to the Riemannian manifold space, the dose parameter manifold and the image quality manifold are constructed, the geodesic line is calculated on the manifold through the Fisher information matrix as the Riemannian metric, and the optimal dose path is found. The system adopts a double-manifold collaborative optimization mechanism, establishes a mapping relationship between the two manifolds, and realizes accurate optimization of parameters in combination with a geometric-guided genetic algorithm, and through pre-scanning, high-risk population analysis, information geometry optimization and automatic parameter adjustment, individualized dose control is realized, the radiation dose is additionally reduced by 30-45% compared with a traditional method, the image quality is maintained or improved, and the safety of CT examination is remarkably improved.

A method for determining a convolution kernel for an iterative statistical algorithm based on a continuous-to-continuous data model. The method is used for image reconstruction from radiation measurements obtained in emission tomography, specifically in a Time-of-Flight Positron Emission Tomography (TOF PET) scanner. The presented method is a non-list-mode solution that reduces the computational complexity of the reconstruction problem, improves the resolution of reconstructed images, reduces the radiation dose absorbed by patients during TOF PET examinations, and / or shortens the measurement acquisition time without significantly compromising the quality of the diagnostic images. Notably, the quality of the functional images remains at the same level. These improvements are achieved by designing the convolution kernel to account for the statistical properties of the measurement signals registered during the TOF PET scanner's acquisition process.

This invention relates to a radiotherapy device and experimental method with switchable high and low dose distributions, belonging to the field of radiotherapy experimental technology. It solves the problem in existing technologies where the radiation dose in low-dose experiments in animal radiotherapy cannot be controlled. The invention includes a shielding platform and a shielding end; the shielding end is rotatably mounted on the shielding platform and has light-transmitting holes arranged in an alternating pattern. In this invention, the radiation beam emitted by the radiation source device directly irradiates the experimental animal, allowing for control of the radiation dose, and the high-dose and low-dose irradiation points on the experimental animal are arranged alternately.

A radiographic imaging apparatus of the present disclosure includes an image outputter outputting a first radiographic image included in continuous radiographic images obtained by radiographic imaging of a subject, an image brightness information extractor obtaining brightness information from the first radiographic image, a first irradiation condition calculator determining a first irradiation condition based on the brightness information, an irradiation controller controlling a radiation dose based on the first irradiation condition, a second irradiation condition calculator determining a second irradiation condition based on a second radiographic image generated based on the first irradiation condition when an imaging site of the subject is fixed, and a dose reducer reducing or maintaining the radiation dose based on the second irradiation condition.

This invention belongs to the field of radiation mutagenesis technology, and relates to a method for mutagenesis of lavender seeds, employing... 60 Lavender seeds are treated with Co-γ rays; the radiation dose is 50-500 Gy, and the dose rate is 1-3 Gy / min. This invention employs... 60 Radiation with Co-γ rays can efficiently induce mutations in the genetic material of lavender seeds, effectively breaking gene linkage and significantly increasing the mutation frequency. This provides a rich material basis for screening lavender mutants, allowing for the selection of seed half-lethal doses, and obtaining plants with variations in leaf color, leaf shape, plant height, and other traits. This provides technical support for lavender breeding using radiation mutagenesis technology.

The application discloses a kind of irradiation dose detection method, device, electronic equipment and readable storage medium, comprising: light source device emits initial light to detection pool, initial light passes through detection pool and dosimeter in detection pool, forms measurement light;Detector receives measurement light, and measurement light is distributed to each detection unit;Each detection unit detects the measurement light received by it, respectively obtains the unit absorbance of each detection unit;Unit absorbance reflects the absorbance of dosimeter under different index information;Data processor obtains dosimeter absorbance according to at least one unit absorbance;Data processor obtains irradiation dose result according to dosimeter absorbance of first measurement light and dosimeter absorbance of second measurement light.The application eliminates the occurrence of the light interference of different index information, improves the absorbance measurement precision, reduces the irradiation dose measurement error, and improves the data value.

This disclosure relates to a microstructure analysis method, system, electronic device, storage medium, and computer program product. The method includes: scanning and imaging a target sample using an X-ray multi-characteristic grating imaging device to determine the target feature signal of the target sample; performing single-energy spectral structural decomposition on the target sample according to a preset continuous mapping relationship and the target feature signal to determine the equivalent thickness distribution of the target sample relative to a preset reference material; and determining the corresponding microstructure quantitative analysis result of the target sample according to a preset quantitative relationship model and the equivalent thickness distribution to reflect the microstructure size characteristics of the target sample. This disclosure does not require increasing the X-ray radiation dose of the X-ray multi-characteristic grating imaging device and can output microstructure quantitative analysis results with clear physical meaning in scenarios with low radiation dose and low spatial resolution. It is applicable to various fields requiring quantitative identification of microstructures and has high accuracy and versatility.

This invention relates to the field of radiation field reconstruction, and discloses a method, apparatus, and device for three-dimensional radiation field reconstruction based on residual networks. It acquires the deployment locations of a finite number of detectors in a three-dimensional radiation field, as well as the radiation dose data detected by these detectors. Based on the deployment locations of the finite detectors, the radiation dose data detected by the finite detectors, and a set low-resolution mesh size, low-resolution radiation distribution data is generated. This low-resolution radiation distribution data is input into a trained deep super-resolution reconstruction model based on a three-dimensional sub-voxel residual network. The deep super-resolution reconstruction model then performs shallow feature extraction, deep residual processing, and sub-voxel upsampling on the low-resolution radiation distribution data to generate high-resolution radiation distribution data. This invention can effectively reduce the computational cost and improve the reconstruction accuracy of radiation distribution data in three-dimensional radiation fields.

This application provides a radiation control method for a radiation device, wherein the radiation device has a fixed unit. The method includes: communicating with a portable unit carried by a target object through the fixed unit to determine the relative position information between the radiation device and the target object; determining a radiation strategy of the radiation device based on at least one of a first radiation dose emitted by the radiation device detected by the fixed unit and a second radiation dose received by the target object detected by the portable unit, and the relative position information; and adjusting the radiation dose to be emitted by the radiation device according to the target dose range indicated by the radiation strategy. This application also provides a radiation control system, device, storage medium, and program product.

This invention discloses a front-end interaction and clinical safety control method and system for boron neutron capture therapy, comprising the following steps: constructing a patient-specific treatment model; during treatment, collecting real-time monitoring data streams containing boron concentration data and physiological state signals through biosensors; inputting the monitoring data streams into the patient-specific treatment model to predict future outcomes; based on the prediction results, generating evaluation results in real time through a dynamic optimization algorithm; arbitrating real-time control commands and physiological state signals for safety, and ultimately controlling the treatment execution device; and displaying the real-time monitoring data streams, prediction results, control commands, and safety status through a unified interactive interface. This invention achieves continuous and prospective prediction of boron drug distribution and radiation dose by constructing a treatment model that integrates the patient's unique anatomical and physiological information and dynamically driving the model using real-time collected in vivo data.

This invention belongs to the field of cell detection technology, specifically involving the application of NR4A1 as an early biomarker for gamma-ray radiation. This invention discovers that in the early stage (2 hours) after gamma-ray radiation, the protein and mRNA levels of NR4A1 are significantly increased, exhibiting a radiation dose-dependent effect. NR4A1 can serve as a 2-hour biomarker for gamma-ray irradiated HeLa cells, allowing for the screening of cells irradiated for 2 hours, differentiating the duration of gamma-ray irradiation, and achieving early diagnosis of cellular gamma-ray radiation.

Volume-of-interest (“VOI”) imaging with computed tomography (“CT”) (e.g., VOI CT in a helical or axial acquisition geometry) is used to produce higher resolution, lower noise images with less radiation dose than is required for equivalent resolution and noise characteristics using standard data acquisitions. Truncation artifacts introduced by the VOI imaging are removed or otherwise reduced using a deep learning model that is trained to remove truncation artifacts from VOI images.

A decomposable range display method displays a decomposable range in a decomposable object having a predetermined structure, the decomposable range display method displaying a decomposable range corresponding to a sampling position of the decomposable object based on measurement information of a radiation dose and a radiation energy at the sampling position and distribution information related to a radioactive distribution in a depth direction corresponding to the sampling position.

The utility model discloses a radioactive source shield case, including shield case body, both ends of shield case body all are provided with the detachable end plate, and the top embedding of shield case body is connected with the cover, the both sides of the top of shield case body all are installed with the fixed base, and the other both sides of the top of shield case body all are installed with the clamping seat of corresponding position with fixed base, the top of fixed base is provided with the rotating mechanism, and the fixed base is connected with the crossbeam through rotating mechanism, and rotating mechanism is used for the rotation of crossbeam on fixed base at least, the clamping seat is provided with locking assembly, and locking assembly is used for the locking of crossbeam one end at least. The utility model discloses the crossbeam can overturn along fixed base to the fixed position installation of radioactive source setting below crossbeam, ensures that radioactive source is in the predetermined position when treating every time, and the diffusion of radioactive ray to the surrounding is limited through shield case body, and the radiation dose that the surrounding healthy tissue receives is reduced.

This invention discloses a method and system for effectively reducing X-ray radiation dose during electrocardiogram (ECG) scanning, relating to the field of artificial intelligence technology. The method includes: acquiring real-time ECG signals of the subject, identifying the R-wave and its occurrence time, and calculating the RR interval between adjacent R-waves; dividing the subject's cardiac cycle based on the RR interval and the R-wave occurrence time, and determining the intense cardiac motion phase and diastolic phase of each cardiac cycle; during the intense cardiac motion phase, controlling the X-ray tube mA value to decrease to a dose reduction mA value below the source mA value; when the current time enters the diastolic phase, controlling the X-ray tube mA value to recover from the dose reduction mA value back to the source mA value; after determining that the X-ray tube mA value has recovered and stabilized at the source mA value, a trigger signal is activated, and the acquisition of projection data is initiated based on the trigger signal. This method helps solve the problem that existing technologies cannot effectively reduce X-ray radiation dose during ECG scanning.

The application discloses an X-ray energy control method and system based on FPGA, and the method comprises the following steps: configuring scanning parameters, wherein the scanning parameters at least comprise a tube current control mode; acquiring real-time scanning parameters, wherein the real-time scanning parameters at least comprise a current scanning angle and a current scanning position; determining a target calculation strategy from a plurality of preset tube current calculation strategies according to the tube current control mode; calculating a target tube current value through FPGA logic operation based on the scanning parameters, the real-time scanning parameters and the target calculation strategy; and outputting the target tube current value to an X-ray tube control system to adjust the tube current of the X-ray tube. The flexible switching and millisecond-level real-time response of a plurality of control algorithms are realized, so that the radiation dose is effectively optimized while the stability of image quality is ensured.

The utility model discloses a liquid-liquid extraction robot system belongs to the technical field of robot, solved the existing liquid-liquid extraction, staff safety cannot guarantee, the problem of low extraction operation efficiency. Including first mechanical arm, second mechanical arm, centrifuge, oscillator and workstation, first mechanical arm and second mechanical arm install in the workstation middle position, centrifuge and oscillator are installed in the both sides of first mechanical arm and second mechanical arm, and first mechanical arm free end is equipped with rotary jaw, and the free end of second mechanical arm is equipped with dexterous hand, and dexterous hand and rotary jaw moving range reach centrifuge and oscillator. The utility model designs the robot of replacing artificial to complete liquid-liquid extraction work in the closed environment of radioactivity, makes it can execute sampling, extraction, separation and multiple complex operation steps, thereby reduces the demand of artificial intervention in the extraction process, significantly reduces the radiation dose of experimental personnel, has very strong popularization.

This invention discloses a method for preparing a personalized 3D-printed tissue compensation membrane for breast cancer radiotherapy based on optical surface scanning, belonging to the field of breast cancer radiotherapy technology. The method includes: acquiring three-dimensional point cloud data of the target area of ​​the patient using a clinical-grade optical surface monitoring system; constructing a three-dimensional model of the body surface using modeling software; generating a personalized three-dimensional model; and then using 3D printing to prepare a solid compensation membrane. The patient wears the compensation membrane and undergoes a CT simulation positioning scan to obtain a CT image set including the compensation membrane and internal anatomical structures. This method achieves precise adhesion between the compensation membrane and the patient's body surface. Through closed-loop quality control throughout the entire process, it changes the conventional procedure where patients can only obtain surface information through CT scans before radiotherapy positioning. This reduces the patient's radiation dose, improves the accuracy of radiotherapy dosage, and balances clinical applicability with ease of operation, providing reliable technical support for breast cancer radiotherapy.

The present application relates to the technical field of three-dimensional integrated circuit protection in aerospace radiation environment, and particularly relates to a method and system for simulating and modeling a microsystem interconnection module based on a through silicon via under proton irradiation. The method comprises: constructing a three-dimensional finite element model containing a through silicon via, a redistribution layer and a micro-bump, adjusting material parameters to extract scattering parameters, and establishing a correlation model between material characteristics and scattering parameters; constructing an equivalent RLC circuit in an ADS environment and establishing a corresponding relationship between the equivalent RLC circuit and the scattering parameters; combining a proton irradiation experiment to obtain scattering parameters under different radiation fluences, and further establishing a correlation model between the radiation fluence and the RLC circuit parameters. The present application combines simulation and experimental methods to achieve precise modeling between the radiation dose, the circuit parameters and the scattering characteristics, and provides support for the electrical performance prediction and protection design of three-dimensional microsystems in complex radiation environments.

A system (30) for modulating radiation dosage during an x-ray guided procedure with an x-ray imaging system (50) comprises a detector (32) and a controller (74). The detector (32) is configured to detect at least one noise-causing event or user behavior event during the x-ray guided procedure with the x-ray imaging system (50), that renders an image quality for x-ray imaging above a threshold image quality unnecessary. The controller (74) is configured to automatically modulate x-ray system parameters that affect image quality and radiation dose based on the detection of the at least one of the noise-causing event or user behavior event.

The application relates to the technical field of medical devices and computer-aided surgical navigation, and discloses a virtual positioning CT-guided lung biopsy method, which utilizes real-time acquired body surface point cloud data to drive a biomechanics model, deduces a displacement field of lung internal grid nodes, and generates a virtual lung model which changes with respiratory motion. Through a fiber grating sensing array embedded in a puncture needle, the three-dimensional shape of the needle body is solved in real time, and an axial force strain is separated. The system monitors the first derivative characteristics of the strain, and when a mechanical event representing penetration of an anatomical boundary is identified, a spatial deviation vector of the physical coordinates of the needle tip and the virtual predicted coordinates is calculated. A local space calibration field is constructed by using a radial basis function, the virtual lung model is non-rigidly corrected based on the deviation vector, and a dynamic navigation image is generated. The application improves the positioning accuracy of lung puncture navigation by combining body surface deduction and puncture mechanical feedback correction model prediction error without increasing the radiation dose.

To provide a method for calibrating an error of a simple transmission type chromic film.SOLUTION: An analysis method for dose distribution of a radiation dose using a chromic film and a transmission type scanner includes: (1) a process for dividing a chromic film irradiated with a radiation into a plurality of regions in parallel with respect to a direction that the transmission type scanner is scanned; (2) a process for arranging each of the divided regions of the chromic film so as to be positioned in a central scanning part of a scanner face that is scanned by a central part of a line light source of the transmission type scanner, causing the transmission type scanner to perform scanning, and acquiring image data of each of the divided regions using the central part of the line light source; and (3) a process for analyzing the dose distribution by combining image data of each of the divided regions acquired by the central part of the line light source.SELECTED DRAWING: None

The utility model discloses a desktop type industrial CT is with protection shell, including upper casing, the lower casing of being located in the bottom of upper casing and the top cover of being located in the top of upper casing, the rear side of upper casing is equipped with a plurality of through grooves, and one side of through groove is equipped with heat dissipation subassembly, heat dissipation subassembly includes the heat dissipation plate of being fixed on upper casing, a plurality of heat dissipation channels that are located in the heat dissipation plate inside, the mounting frame of being fixed on heat dissipation plate and the fan of being fixed on mounting frame, and heat dissipation channel is equipped with the lead layer on the inner wall and is communicated with through groove, and the one side of heat dissipation plate is equipped with shielding assembly close to mounting frame. Through above -mentioned structure, the through groove on upper casing is communicated with the multi -bending heat dissipation channel inside heat dissipation plate, and the fan of installation is used for forced convection heat dissipation, realizes the heat dissipation of shell inside, and the inner wall of heat dissipation channel is plated lead, and adopts the multi -bending structure and forms the radiation attenuation path, and the radiation dose is reduced through multiple turns, and the heat dissipation performance is optimized while guaranteeing the radiation safety.

A radiation dose rate control method, which relates to the technology of radiation, and an accelerator (100). The control method is used for an electron linear accelerator (100) comprising a microwave source, an electron gun (102) and an accelerating tube (104). The control method comprises: when an electron linear accelerator (100) outputs a beam, monitoring a first event used for indicating a change of a beam output parameter (S610), wherein the beam output parameter comprises a pulse of an electron gun (102) and a microwave power of a microwave source, and the first event is determined by means of radiation protection requirements; and in response to monitoring the first event, cutting off the pulse of the electron gun (102), and switching a first microwave power of the microwave source to a second microwave power, so that the leakage dose rate of a radiation safety boundary is less than or equal to a first preset threshold (S620), wherein the level of dark current in an accelerating tube (104) under the second microwave power is less than or equal to a second preset threshold. Further provided are a radiation dose rate control apparatus, an accelerator (100), and a radiation apparatus.