221 results about "Ct scanners" patented technology

The invention provides a visual rock-soil multi-field coupling direct shear creepmeter which comprises a shear box device, a loading device, a temperature control device, a disturbance load device, a seepage control device and a microstructure tracking device, the shear box device is used for loading a rock-soil sample, the loading device comprises a normal loading device and a shear loading device, and the temperature control device is used for controlling the temperature of the normal loading device. The temperature control device comprises a dry-wet cycle device and a freeze-thaw cycle device, the disturbance load device comprises a plurality of vibration motors, the seepage control device comprises a water inlet control assembly and an electronic measuring cylinder, and the microstructure tracking device comprises a micro camera and an X-CT scanner. The visualized rock-soil multi-field coupling direct shear creepmeter provided by the invention can realize rock-soil direct shear creep tests under multi-field coupling of a dynamic seepage field, a dynamic stress field, a dynamic temperature field, a dynamic moisture field, a dynamic water chemical field and the like.

The invention belongs to the field of CT image processing, and particularly relates to a CT image reconstruction method based on a three-dimensional diffusion model and a related device.The method comprises the steps that a medical CT scanner is adopted to obtain three-dimensional CT voxel data, and the three-dimensional CT voxel data is preprocessed; extracting a medical object surface point cloud from the preprocessed three-dimensional CT voxel data by adopting a voxel-level reconstruction algorithm, and generating three-dimensional sparse point cloud data; processing the three-dimensional sparse point cloud data by adopting a 3D Gaussian splashing technology, and converting the three-dimensional sparse point cloud data into three-dimensional Gaussian distribution data by using a pre-trained three-dimensional Gaussian kernel; gradually adding Gaussian noise to the three-dimensional Gaussian distribution data by adopting a three-dimensional diffusion model, and gradually removing the Gaussian noise to generate reconstructed three-dimensional Gaussian distribution data; and projecting the reconstructed three-dimensional Gaussian distribution data to a two-dimensional plane by adopting a rendering technology to generate a two-dimensional CT reconstructed image. According to the method, the advantages of the 3D Gaussian splashing technology and the three-dimensional diffusion model are combined, efficient, real-time and denoising medical image reconstruction can be achieved under the low-dose CT imaging condition, and meanwhile the problem of white floater artifacts possibly occurring in the reconstruction process is effectively solved.

The invention relates to the technical field of deep underground engineering, in particular to a deep underground engineering surrounding rock loose circle evolution process visualization method and related equipment. According to the technical scheme, the method comprises the steps that rock samples collected on site are scanned at different loading stages through a CT scanner, CT scanning images are obtained, meanwhile, monitoring sections and monitoring points are arranged on the deep underground engineering site, displacement, stress and strain sensors are installed, and surrounding rock information is obtained through the drilling camera shooting technology; finite element software is used for establishing a numerical model of deep underground engineering, a viscoelastic-plastic constitutive model considering rock damage and rheological characteristics is selected, model parameters are assigned according to CT scanning images and rock mechanical test results, and corrected numerical simulation data are obtained through parameter inversion correction. According to the method, reliable surrounding rock information is obtained by comprehensively applying multiple data acquisition means, and the accuracy of a numerical simulation result is improved by adopting the viscoelastic-plastic constitutive model considering rock damage and rheological characteristics.

The invention belongs to but is not limited to the technical field of petroleum engineering, and particularly relates to a shale reservoir polymer fracturing fluid retention characteristic analysis method and system, and the method comprises the following steps: S1, carrying out a displacement experiment by using polymer solutions with different molecular weights and concentrations; s2, the retention condition of polymers in the rock core before and after displacement is observed through a micron CT and scanning electron microscope technology; and S3, analyzing the influence of the polymer solutions with different molecular weights and concentrations on the retention characteristics in the shale reservoir. The invention aims to carry out a displacement experiment on the rock core by using polymer solutions with different molecular weights and concentrations, and then observe and compare the polymer solutions of the rock core before and after displacement by using equipment such as a CT scanner and an electron microscope, so as to obtain the retention and migration conditions of the polymer in the hole seam of the rock core. The retention characteristics of fracturing fluid polymer molecules in a microporous structure and a matrix are studied, so that a correct polymer molecular weight range is provided for reservoir transformation, fracturing fluid reservoir damage is reduced, and the fracturing yield increasing effect is finally improved.

The invention discloses a real-time monitoring method and system for the breakage rate and flow conductivity of a propping agent based on CT scanning. The real-time monitoring method comprises the steps that a CT scanner is externally connected to a quartz glass observation window of a flow guide chamber through a mechanical arm; performing initial scanning on the propping agent in the flow guide chamber through a CT scanner to obtain initial particle volume distribution and determine an initial volume and a minimum volume threshold value; setting the temperature and overburden pressure of the flow guide chamber, and injecting fluid through a constant-speed constant-pressure pump; cT dynamic scanning is triggered at a fixed time interval, and the real-time breakage rate is calculated; when the real-time breakage rate is larger than 5%, the pressure difference, the flow and the crack width are obtained; calculating the flow conductivity by combining the fluid viscosity and the length of the flow guide chamber; when the real-time breakage rate is smaller than or equal to 5%, returning to scan again; and when the pressure difference is greater than 5MPa, the experiment is automatically stopped. According to the invention, the three-dimensional image data in the experiment process can be rapidly obtained and processed and analyzed in real time, so that the measurement time is remarkably shortened, and the measurement efficiency is improved.

The invention discloses a copper wire tinning method for tinned copper stranded wire production, which relates to the technical field of metal surface treatment, and comprises the following steps: releasing a copper wire to an ionic liquid electrophoresis tank, applying an electric field to strip surface oxides, and then carrying out three-stage countercurrent rinsing to generate a clean copper wire; putting the clean copper wire into a composite plating tank, monitoring the tin liquid viscosity and the copper wire linear speed in real time, calculating the magnetic field gradient, and controlling tin crystal oriented growth according to the magnetic field gradient to generate an oriented crystallization tinned copper wire; the surface temperature of the directionally crystallized tinned copper wire is monitored in real time and compared with a preset temperature threshold value, a temperature permission trigger signal is generated, the annular array spray gun is triggered to work according to the temperature permission trigger signal, and a densified tinned copper wire is generated; and the densified tinned copper wire is scanned through a micro-focus CT scanner, a gap three-dimensional point cloud picture is generated, the gap size and the normal angle of the gap three-dimensional point cloud picture are analyzed, the optimal spraying parameters are recognized, and the passivation film tinned copper wire is generated.

A high-temperature and high-pressure core displacement test system includes a CT scanner configured to perform CT scanning, a gripper system configured to grip a core, a machine tool configured to move the gripper system to the CT scanner for CT scanning, a gripper load control system configured to heat and input a fluid into or / and receive a fluid output from the gripper system, and an acquisition and data analysis system configured to acquire a temperature and a pressure within a core gripping cavity, and detection data of the CT scanner and strain rosettes for analysis. According to the high-temperature and high-pressure core displacement test system and method, the strength of the gripper system in a high-temperature and high-pressure environment is improved, the projection performance of CT rays is ensured, and the optical fiber positioning precision and the core deformation measurement precision in a CT rapid scanning state are improved.

The invention relates to a low-dose computed tomography (CT) denoising method of a tight frame wavelet, and the method comprises the steps: S1, collecting a low-dose CT picture and a conventional-dose CT picture to construct a CT data set, and converting the CT data set into a Numpy matrix; s2, GTF (Geometric Tigh Framelet) transformation is carried out on the image data to obtain one low-frequency component and eight high-frequency components, the high-frequency components are grouped, and the number of the high-frequency components in each group is 2, 3 and 3; s3, creating a tight frame diffusion model (Tight Frame Diffusion Model), and carrying out the denoising of the low-frequency component; s4, a group high-frequency enhanced network (GHFEN) is created, and the high-frequency component is recovered by the group high-frequency enhanced network (GHFEN), and the high-frequency component of the high-frequency component is recovered by the group high-frequency enhanced network (GHFEN), and the high-frequency component of the high-frequency component is recovered by the group high-frequency enhanced network (GHFEN); and S5, finally, carrying out inverse GTF transformation on the enhanced and denoised components to obtain a denoised image. By using the CT image denoising method and the CT image denoising device, a CT image denoising service which is more in line with a human eye observation effect can be provided for a low-dose CT obtained by a user through a CT scanner. The multi-level feature perception low-dose CT denoising method can be widely applied to the field of CT denoising.

The invention relates to the field of electrocardiogram treatment, and discloses an individualized electrocardiogram operation process relying on iconography examination and an AI large model, which comprises the following steps: S1, chest CT image acquisition: a CT scanner is used for acquiring chest image data of a patient, the CT scanner can generate high-resolution multilayer CT images, and the data format comprises but is not limited to a DICOM format; s2, heart projection position analysis: carrying out image preprocessing, heart segmentation, heart center point calculation and heart edge positioning on the acquired CT image data; and S3, lead position optimization: generating a lead electrode position based on a heart projection position by using an AI large model. According to the method, the actual position and form of the heart of each patient in the thoracic cavity can be accurately determined through CT image acquisition and heart projection position analysis, and the optimized lead position is generated by utilizing the AI large model based on the individualized projection positions, so that the lead electrode can more accurately capture the electrical activity of the heart.

The utility model discloses an inclination adjusting system of a CT scanning gantry, which comprises a fixed underframe, the left side and the right side of the top of the fixed underframe are fixedly connected with mounting support plates, the top of the surface of each mounting support plate is movably provided with a movable column, the surface of each movable column is sleeved with an angle sensor, and the angle sensor is fixedly connected with the fixed underframe. And a CT scanner rack is fixedly mounted on the opposite sides of the two movable columns. According to the utility model, the angle sensor, the laser distance measuring sensor, the auxiliary plate and the movable column are matched for use, so that the purposes of angle detection and distance detection can be achieved by utilizing the characteristics of the angle sensor and the laser distance measuring sensor, and the purpose of intelligent monitoring is achieved; through cooperative use of the transmission adjusting assembly, the rotating speed sensor and the speed reduction driving assembly, the CT scanner can be driven by the variable-speed motor, namely the movable plate can act to change the inclination angle of the CT scanner rack, and meanwhile the rotating speed of the variable-speed motor can be flexibly adjusted under cooperation of the rotating speed sensor.

A rotating device for a computed tomography (CT) scanner, and a CT scanner. The rotating device for the CT scanner comprises a connection base (1) and a detector assembly (2). The connection base (1) is a circular ring base (11) with an outer peripheral wall surrounded by a connecting frame (12), and an installation part is provided on the connecting frame (12). The installation part comprises a detector installation portion, on which the detector assembly (2) is arranged. The detector installation portion is in communication with a radiation receiving slot (112). The detector installation portion comprises a plurality of detector sub-installation portions. A separation structure is provided between two adjacent detector sub-installation portions. The detector assembly (2) comprises a plurality of detection units, which are mounted on the plurality of detector sub-installation portions in a one-to-one correspondence manner.

A method of motion correction image reconstruction for photon-counting CT images includes scanning a subject via a photon-counting CT scanner device to obtain measured projection data; performing, via motion correction circuitry of the motion correction system, a LLE motion correction algorithm on the measured projection data to obtain motion correction data; generating, via reconstruction circuitry of the motion correction system, reconstructed image data from the motion correction data; and outputting corrected image data based, at least in part, on the reconstructed image data. A binary bad pixel mask is applied to exclude contributions from the bad pixels to the measured projection data. An unreliable volume mask is applied to exclude contributions from X-ray beams that passed through unreliable portions of the reconstructed image data. A virtual static object removal algorithm is performed to remove a static object from the measured projection data.

A method of manufacturing customized ceramic labial / lingual orthodontic brackets by digital light processing, said method comprises measuring dentition data of a profile of teeth of a patient, wherein measuring dentition data is performed using a CT scanner or intra-oral scanner, based on the dentition data, creating a three dimensional computer-assisted design (3D CAD) model of the patient's teeth using reverse engineering, and saving the 3D CAD model on a computer, designing a 3D CAD bracket structure model for a single labial or lingual bracket structure, importing the 3D CAD bracket structure model into a Digital Light Processing (DLP) machine, directly producing the bracket by layer manufacturing.

An apparatus for performing surgery includes a first link that includes a first end and a second end, a second link that includes a first end and a second end, and an end effector positioned at the first end of the first link. The first end of the second link is coupled to the first link by a hinge. The end effector traces along a surface, which may be spherical or hemispherical. A system that includes the apparatus and an imaging device, such as a CT scanner, is also described.

A controller and method are for configuring operation of a kVp-s witching spectral CT imaging apparatus which, in at least one mode, aims to mimic the user-side operating workflow of a conventional non-spectral CT scanner. The controller receives user-defined settings associated with operation of a non-spectral CT system, comprising a desired peak tube voltage and desired tube current. Based on these user-specified inputs, the controller performs a conversion procedure to derive a set of spectral CT operating parameters which are estimated to result in administration of the same dose of X-ray radiation over a single kVp switching cycle as would be administered by the conventional scanner over a same time duration. Thus, the user can acquire CT projection and image data using a spectral CT scanner, without a need to change their own operating workflow, and furthermore in a way that will administer the same radiographic density as they would expect to achieve with the same user-specified settings on a conventional scanner.

The utility model discloses a lifting platform for CT (computed tomography) scanning, which relates to the technical field of CT scanning equipment and comprises a base, a cross lifting rod, a pedestal and a sliding table, a first screw mechanism is arranged on the base and used for driving the cross lifting rod to work, and a second screw mechanism is arranged on the pedestal and used for driving the sliding table to move horizontally. Lifting work of the lifting table is achieved, and an examiner is automatically pushed to horizontally move in and out of the CT scanner; the power-off unlocking mechanism used for enabling the sliding table to manually slide on the pedestal is arranged on the second screw rod mechanism, so that the manual sliding table can be automatically switched to enable an inspector to quickly get out of order and get off the table when a fault occurs or power is off in an emergency, and the use safety of the equipment is effectively improved.

A CT scanner for performing a brain scan performs a low-dose 3D scan in a first field of view. By analyzing the low-dose 3D scan, for example using landmark detection, a proposed field of view for a full-dose 3D brain scan is obtained. A representation of the proposed field of view is displayed and a final field of view is generated as the proposed field of view or an updated version of the proposed field of view provided by a user of the CT scanner.

The invention provides a porous medium water body distribution calculation model construction method based on CT structure reconstruction, and the method comprises the steps: selecting a large-scale coal sample according to a scale standard used in a laboratory coal water injection experiment; performing a water injection experiment on the large-scale coal sample according to the selected parameters and a preset water injection simulation scheme so as to simulate the distribution and flow of a water body in the porous medium; performing scanning calculation on the large-scale coal sample in the experimental environment by using a CT scanner to obtain a large-scale structure model; importing the large-scale structure model into finite element model software, and establishing a numerical simulation model; and calculating the numerical simulation model based on fluid exchange between different media to construct a porous medium water body distribution calculation model, thereby realizing research on the distribution change rule of the water body of the injected coal according to the porous medium water body distribution calculation model. Scientific basis can be provided for researching the influence of pore and crack structures on water body distribution of the water injection coal body.

The invention relates to the field of medical image data refinement processing, in particular to a reconstructed visual field image processing method based on a convolutional neural network, which comprises the following steps: acquiring image association features by using a real-time reconstructed visual field image; establishing a reconstructed visual field image multistage analysis screening model based on a convolutional neural network by using the image correlation features; a reconstructed view image processing result is obtained by using the reconstructed view image multi-stage analysis screening model, various features of each stage under a scanning view and a reconstructed view are extracted through set reconstructed view image error analysis processing, the applicability of the scheme is well helped, the method can be deployed, implemented and applied to different set CT scanners, and the method is suitable for popularization and application. And meanwhile, on the premise of not changing a scanned image and a reconstructed view image, a multi-stage classification screening model is established based on the convolutional neural network, and a verification iteration process is added in the scheme, so that stable and efficient operation during actual application is ensured.

This invention discloses a two-dimensional physical simulation experimental device and method for CO2 utilization and storage in gas reservoirs. This experimental method enhances natural gas recovery by injecting CO2 and conducts storage simulation experiments. In this experiment, CO2 with an extracted indicator is injected into a sand-filled model saturated with natural gas to conduct a gas drive experiment. Then, an X-CT scanner is used to scan the long core model at different times. The attenuated X-rays are projected onto developing paper, and high-definition cameras are used to capture images of the developing paper at different times. The light intensity at each point in the developing paper images at different times is statistically processed to obtain the CO2 concentration at different points at different times. This allows for real-time monitoring of the CO2 distribution in the core model at different times, and the study of CO2 driving mechanism, migration, and storage laws.

The invention relates to a metal artifact removal method based on multi-energy-level broad-spectrum X-ray data. The method comprises the following steps: acquiring double-energy-level CT image data and multi-energy-level CT image data of a plurality of patients containing metal artifacts, and standard image data after removing the metal artifacts, and constructing a training sample set; based on the CT image data of different energy levels corresponding to the same patient in the training sample set, performing metal region segmentation to obtain a metal region mask image; utilizing the training sample set and the metal area mask image training model to obtain a convergent metal artifact removal model; and inputting the to-be-processed CT image data of any energy level into the metal artifact removal model to obtain the CT image data after metal artifacts are removed. The metal artifact removing method solves the problems that in the prior art, a metal artifact removing method depends on a high-end CT scanner, or analog data are adopted, the data energy level is single, and consequently the existing method is poor in generalization ability and poor in low-energy-level CT scanning image processing effect.

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 present invention relates to the field of clinical radiotherapy technology, and in particular to a test system and method for the effect of an iodized oil area on photon radiotherapy dose. The system comprises: a plurality of iodized oil samples, each of which is made by mixing minced pig liver and iodized oil in different proportions; a cylindrical sample tube, each of which is composed of a plurality of detachably connected sample chambers, each of which is provided with the iodized oil samples in the sample chambers, each corresponding to the iodized oil sample. The linear accelerator irradiates an abdominal simulation phantom into which the sample tube is inserted. The CT scanner is connected to a radiotherapy planning system, which simulates the irradiation of the sample tube with a photon beam based on a CT image and obtains a simulated dose of electron density. The present application can characterize the effect of the iodized oil area on the photon radiotherapy dose by comparing the simulated dose of electron density obtained by the radiotherapy planning system with the actual dose of electron density obtained by an ionization chamber detector.

The computed tomography (CT) scanner gantry rotates relative to the fixed substrate of the CT scanner. During gantry rotation, digital data is transmitted from a data source via a modulator, transmission channel, and demodulator to a data receiver between the gantry and the substrate. A predistortion device located upstream of the transmission channel predistorts the transmitted signal generated by the modulator from the data source through modulation according to a predistortion rule. Only the predistorted transmitted signal is transmitted to the transmission channel. Alternatively or additionally, a postdistortion device located downstream of the transmission channel postdistorts the signal transmitted via the transmission channel according to a postdistortion rule, and only the postdistorted signal is transmitted to the demodulator. The predistortion rule and / or postdistortion rule are repeatedly reset by a setting device during gantry rotation.

The application provides a production method of a CT scanner plug, comprising the following steps: step 1: installing a sealing ring into a groove of a positioning disc; assembling a positioning shaft and a pin together; combining the positioning shaft and the positioning disc together; placing a shell into an annular groove of the positioning disc and fastening by means of an inner hexagonal screw; inserting a tail sleeve accessory into the shell, and welding a wire core of the tail sleeve accessory with the pin; inserting a front end of a shielding sleeve into a gap between the positioning shaft and the positioning disc, and completing assembly of the plug accessory and a mold; step 2: pouring epoxy resin into the shell, then placing the plug accessory together with the mold into a vacuum barrel, and performing vacuumizing; step 3: placing the plug accessory and the mold into an oven for curing, removing the mold after the epoxy resin is cured, and obtaining a CT scanner plug product. The application can accurately position each accessory of the CT scanner plug, ensure smooth pouring of the epoxy resin, and ensure that there is no air bubble in the poured epoxy resin, thereby ensuring product quality.

The invention relates to the technical field of power battery testing, and discloses a corner drop testing system and method under a power lithium battery monomer transportation environment. The system comprises a falling control module, a falling table capable of adjusting the falling height and angle of a battery, a positioning clamp and a parameter control unit, and the parameter control unit sets the falling height according to different transportation types such as highways, railways, waterways and aviation and classic falling scenes; the environment simulation module is used for simulating a transportation high-low temperature environment by using a temperature control box, and a falling table and a positioning clamp are arranged in the environment simulation module; the damage analysis module is used for scanning the fallen battery by using an industrial CT code scanner to generate a three-dimensional reconstructed image, quantifying internal damage characteristics and judging the safety of the battery under the transportation type corresponding to the test height; the technical problem that in an existing power battery drop test, deviation exists between test design and an actual transportation environment, and blind areas exist in evaluation indexes, so that the effectiveness of a test result is low is solved.

The present invention relates to an image processing apparatus, method, and program that reduce the difference in image quality between high-absorbent regions and adjacent regions in a tomographic image. [Solution] The system includes a processor, which identifies high-absorbent regions in a projection image obtained by imaging a subject containing high-absorbent materials using a CT scanner, and derives a corrected projection image by performing a correction on the high-absorbent regions in the projection image to suppress the image quality difference between the high-absorbent regions and other regions other than the high-absorbent regions.

The invention provides CT equipment with a breathing machine. The CT equipment comprises a CT scanner, the breathing machine and a bed body. A scanning hollow part is arranged in the middle of the CT scanner, a transmission seat is fixedly arranged at the front bottom end of the CT scanner, a breathing machine is movably connected to the transmission seat and provided with a telescopic air pipe, a bed body is fixedly arranged on the breathing machine and corresponds to the scanning hollow part of the CT scanner, a transmission mechanism is arranged in the transmission seat, and the transmission mechanism is in transmission connection with the breathing machine. And the CT scanner is electrically connected with the breathing machine. According to the invention, the CT scanner and the breathing machine are arranged as an integrated device, and the breathing machine can automatically control the breathing pressure and frequency of the pet according to the operation of the CT scanner, so that the pet can make the corresponding breathing pressure and frequency to comply with the scanning detection of the CT scanner; the pet breathing control system has the advantages of stably controlling pet breathing, reducing motion artifacts caused by pet breathing motion during CT scanning, being capable of improving pet safety, being convenient to use and efficient in operation and the like.

The invention discloses a detector which is not provided with an external collimator and can be used for SPECT (single photon emission computed tomography) and PET (positron emission tomography). The detector comprises a crystal unit and a photoelectric detection layer, a plurality of gaps are formed in the top of the crystal unit, the non-gap structure part in the crystal unit is used for blocking gamma photons emitted by SPECT nuclides, and the gaps are used for collimating the incident gamma photons emitted by the SPECT nuclides and then enabling the gamma photons to enter the bottom of the crystal unit; the photoelectric detection layer is used for detecting scintillation light excited by the gamma photons in the crystal unit and converting the scintillation light into electric signals. The imaging system comprises a plurality of detectors which are arranged according to a set rule. According to the invention, the problems of high cost, heavy system and lack of multi-nuclide simultaneous imaging capability of traditional nuclear medicine imaging are solved, and a solution is expected to be provided for a next-generation high-performance PET / SPECT / CT scanner.

This invention relates to a bone mineral density measurement system and method. The system includes a CT scanner with a quantitative computed tomography (QCT) module, an independent single-calibration phantom, and a QCT data image processing program. The devices can exchange data via network or mobile storage. The data receiving module of the QCT data image processing program receives medical digital images from the CT scanner and measures the patient's bone mineral density through the bone mineral density analysis module. This invention combines a CT scanner, QCT, and a single-calibration phantom, employing an asynchronous scanning method that separates the phantom and the patient. This results in higher measurement accuracy, greater convenience, and improved patient comfort.