23 results about "Spiral ct" patented technology

The invention discloses an early lung cancer screening method based on transfer learning. The method comprises the following steps: S1, obtaining preprocessed three-dimensional volume data; s2, generating a multi-scale enhanced feature map; s3, obtaining a preliminary micro-nodule detection result; s4, obtaining a first-stage optimization model; s5, performing second-stage training on the first-stage optimization model by adopting a double-normal-form transfer learning strategy to obtain a transfer optimization model; s6, embedding an adversarial domain adaptive module in the migration optimization model to obtain a cross-domain robust model; and S7, in a clinical reasoning stage, outputting a micro-nodule detection result for the new chest low-dose spiral CT original image data by using the cross-domain robust model. According to the invention, the model can adaptively emphasize the local gradient difference between the lung micronodule and the background texture, thereby improving the discrimination capability of the weak boundary region.

The invention discloses a low-dose 3D spiral CT reconstruction method and system based on a context cold diffusion model, and the method comprises the following steps: converting a linear inverse problem of CT imaging into an optimization problem, and adding a regularization term; based on a near-end gradient descent framework, solving the optimization problem by adopting an iterative shrinkage threshold algorithm, replacing a near-end operator in the near-end gradient descent method with a pre-trained two-dimensional cold diffusion model, and replacing a regularization item with the pre-trained cold diffusion model; when the cold diffusion model is pre-trained, three-dimensional context information formed by a current slice and two adjacent slices is used as the input of the cold diffusion model; taking a low-dose two-dimensional CT image as input, and performing low-dose 3D spiral CT image reconstruction by adopting the trained network; by combining the physical imaging model and the deep learning prior, the reconstruction quality and efficiency of the low-dose CT are remarkably improved, the noise and artifacts in the low-dose CT image are remarkably reduced, and the quality of the low-dose CT image is remarkably improved.

The invention relates to the technical field of osteoporosis screening, in particular to a method for screening osteoporosis of patients with spine deformation by using spiral CT (computed tomography) image.The method comprises the steps that a plurality of patients with spine deformation are scanned through a spiral CT machine, and a coronal plane CT image and a sagittal plane CT image of the spine of each patient and a cross section CT image of each vertebra node in the spine are obtained; acquiring the bone mineral density excellence degree of each vertebra node in the spine of each patient; obtaining the abnormal degree of each gap distance in the gap distance sequence of each patient; obtaining the influence degree of osteoporosis on each gap distance in the gap distance sequence of each patient; according to the influence degree, the first influence degree and the bone mineral density rule damage degree, the osteoporosis risk degree of each vertebra node in the spine of each patient is obtained; and evaluating the osteoporosis condition of each patient. According to the invention, the screening accuracy for osteoporosis of patients with spinal deformations is improved.

The invention discloses a wooden artwork source digital identity authentication method based on CT scanning. According to the technical scheme, the wooden artwork source digital identity authentication method is characterized by comprising the steps that S1, multi-row spiral CT or industrial micro-focus CT scanning equipment is selected according to the size of an artwork to obtain three-dimensional volume data; s2, performing image reconstruction preprocessing and feature region extraction on the three-dimensional volume data to obtain an artwork feature image; s3, analyzing a macroscopic structure feature, a mesoscopic texture feature, a microscopic detail feature and a feature image set of the to-be-authenticated artwork; s4, setting a unique identity code, and generating a digital identity file of the artwork; s5, obtaining feature parameters and digital fingerprint vectors of the artwork according to the feature image set; s6, inputting the digital fingerprint vector into an artwork authentication model, and outputting an authentication result corresponding to the artwork according to the authentication model; and a digital identity certificate and a block chain evidence storage record are generated according to the authentication result. According to the invention, the safety and reliability of identity authentication of the wooden artwork are improved.

The invention is suitable for the technical field of spiral CT scanning, and provides a stator system capable of achieving spiral CT scanning, the stator system comprises a stator support, a stator and a rotor assembly, the stator is installed on the stator support, one end of the rotor assembly is rotatably installed on the stator support through a bearing, a large belt wheel and a small belt wheel are installed on the stator support, and the large belt wheel and the small belt wheel are rotatably installed on the rotor assembly through a bearing. The small belt wheel is in transmission connection with the large belt wheel through a synchronous belt, the large belt wheel is in transmission connection with one end of the rotor assembly, a sliding ring and a sliding ring cover assembly are installed on one side of the stator support, and a tensioning wheel assembly, a sound insulation cover assembly, a CT rotor plug pin assembly and a motor adapter plate are installed on the stator support. A motor is installed on the motor adapter plate, and the output end of the motor is in transmission connection with the small belt wheel. The operation efficiency and stability of the equipment can be effectively improved, the noise level is reduced, and the abrasion and failure rate of the equipment are reduced, so that the service life of the equipment is prolonged, and the detection accuracy and reliability are improved.

This invention provides a control method for a spiral CT scanner, the method comprising: receiving vital sign data of a scanned object; formulating a first scan plan based on the vital sign data; performing a CT scan on the scanned object according to the first scan plan to obtain first projection data, the first projection data including projection data already acquired under the first scan plan and projection data to be acquired; performing an inspection using the first projection data according to image reconstruction inspection rules; evaluating the inspection results according to specific conditions, if the evaluation results meet the specific conditions, maintaining the first scan plan, if the evaluation results do not meet the specific conditions, generating a second scan plan and continuing to perform a CT scan on the scanned object according to the second scan plan, and obtaining second projection data, wherein the specific conditions are whether the first projection data is sufficient or redundant for image reconstruction; and performing image reconstruction based on the first projection data and / or the second projection data.

The invention relates to the field of X-ray CT imaging nondestructive testing, in particular to a spiral CT imaging system based on an integrated open-tube micro-focus ray source, which comprises a ray source, a detector system, a mechanical system, a safety protection system and a control system, wherein the radiation source is in an open type, and a lamp filament of the radiation source is a replaceable lamp filament; the detector system comprises an area array detector, a high-precision integrated power supply module and ray and electromagnetic shielding equipment; the mechanical system comprises a mechanical transmission mechanism and is mainly used for adjusting far and near positions and rotary scanning of the radiation source and the detector system; the safety protection system comprises a main cabin body and two auxiliary cabin bodies, a sliding ring is installed at the bottom of the main cabin body, and the ray source is installed on the sliding ring; and the control system is used for controlling the operation of the radiation source and other systems. The method has the advantages that the service life of the spiral CT is prolonged, the detection cost is reduced, and the detection quality is improved.

The invention provides a multi-modal CT image data fusion three-dimensional reconstruction method for puncture positioning, and the method comprises the steps: constructing a high-dimensional feature space containing an anatomical structure, metabolic activity and time-varying information through the feature coding of spiral CT and multi-phase PET data; modal alignment is realized by using a mutual information-driven dual-constraint registration mechanism, and cognitive fusion of cross-modal features is completed in combination with dynamic weight tensors of patient physiological features, clinical requirements and organ semantics; and finally, through adaptive light field rendering and topology maintenance optimization, a three-dimensional reconstruction model with medical accuracy and clinical guidance is generated, and accurate visual support is provided for puncture surgery.

This invention belongs to the field of digital core spiral CT scanning analysis technology, and relates to a method, device, and storage medium for characterizing coal seam intercalation. The method includes the following steps: acquiring a CT grayscale image of the coal seam; classifying the inorganic minerals in the CT grayscale image; establishing an inorganic mineral classification and identification chart for the coal seam; acquiring the inorganic mineral content of each CT scan cross-section corresponding to the coal seam; calculating the brittleness parameter of each CT scan cross-section; and generating characterization results based on the CT grayscale image, the inorganic mineral content, and the brittleness parameter. The coal seam intercalation characterization method, device, and storage medium provided in this application utilize a coal reservoir mineral content and brittleness parameter evaluation method based on full-diameter CT, achieving for the first time a quantitative evaluation of the inorganic mineral content and brittleness parameter of the entire well section of a coal reservoir at the millimeter level, providing valuable data support for the next step of coalbed methane development engineering fracturing.

The invention relates to the technical field of new material detection, in particular to a medical device for intravascular embolism treatment and a control system thereof.The medical device comprises a miniature pressure sensor, a temperature sensor, a magnetic sensor, an LED lamp, a resistance-type heating piece, a catheter, a display screen, an embolism agent storage tank, an embolism agent conveying pipeline, a carrier, a magnetic field generator, the control system and a spiral CT scanner; the high-precision blood vessel 3D model is constructed through the medical image data, the injection speed and the injection amount of the embolic agent are planned, a reasonable injection scheme of the embolic agent and the complete patient blood vessel 3D model are obtained, embolic agent injection can be conveniently conducted on a patient subsequently, and by accurately controlling the intensity and the direction of the magnetic field, the blood vessel 3D model can be obtained. Real-time and accurate positioning of the position and direction of the catheter in a blood vessel is achieved, and accurate release of an embolic agent is achieved through an embolic agent release system integrating temperature control and light curing functions.

The invention relates to a cone beam spiral CT system. The cone-beam spiral CT system comprises: an accelerator configured to send cone-beam rays to an object to be measured; the detector device is configured to receive cone-beam rays penetrating through an object to be detected, the screw pitch of the cone-beam spiral CT system is larger than 1.5, the detector device is a detector array, the detector array comprises a plurality of detectors arranged in an array mode, the detector array comprises a plurality of rows of detectors arranged at intervals in the row direction, and the detector array is configured to receive the cone-beam rays penetrating through the object to be detected. The row direction is the advancing direction of the to-be-detected object. According to the invention, large-pitch configuration is adopted, so that the scanning speed is remarkably improved, and the imaging requirement in a large-flux scene can be met.

The present application relates to a kind of high-energy industrial spiral CT systems, belong to CT scanning technical field, solve the scanning difficult problem of oversized workpiece.The CT system of the present application includes: workpiece conveying mechanism and scanning system;Workpiece conveying mechanism includes: support platform, first linear conveying component, second linear conveying component and driving device;Support platform is slidably installed above first linear conveying component and can be driven displacement by driving device;First linear conveying component and second linear conveying component are respectively arranged at the front and rear of scanning system;Scanning system includes: scanning assembly, rotating slip ring component and support assembly;Scanning assembly is rotatably installed on the support assembly by rotating slip ring component, and scanning assembly can scan the workpiece to be measured when rotating.The present application realizes the scanning of large-size workpiece and does not need workpiece rotation.

The present invention belongs to the technical field of dynamic detection tests, and discloses a dynamic binocular X-ray detection device and a detection method. The dynamic binocular X-ray detection device includes a ray protection device and a detection device arranged inside the ray protection device. The detection device includes a ray source assembly, a detector assembly, a spiral CT observation platform, a drop tester and a drop platform. The spiral CT observation platform is used to drive the product to be tested to move along the X direction to a position where the drop tester can adsorb the product to be tested. The drop tester drives the product to be tested to a specified height and makes it fall onto the drop platform. Two ray source assemblies and two detector assemblies realize dynamic binocular X-ray detection of the falling product to be tested. The present invention realizes dynamic damage detection of the product to be tested during the falling process, which is beneficial to studying the damage mechanism of the product to be tested, provides a test parameter basis for the optimized design of the product to be tested, can greatly reduce the number of tests, shorten the development cycle and reduce costs.

The invention discloses a multi-source spiral CT (Computed Tomography) analysis and reconstruction method based on cone beam-parallel beam rearrangement, which comprises the following steps of: firstly, carrying out denoising processing on high-noise projection data, and effectively inhibiting noise and reserving edge information by adopting a strategy of combining bilateral filtering with residual image and bilateral filtering; then, rearranging the spiral cone beam projection data of the multi-source CT into three-dimensional parallel beam projection by using a cone beam-parallel beam rearrangement algorithm; then, parallel beam filtering is carried out on the rearranged projection data; and finally, carrying out cone angle weighted back projection on the filtered parallel beam projection to obtain an analytic reconstruction image of the multi-source CT. According to the method, a rapid analysis reconstruction algorithm for the multi-source CT is realized, the reconstruction problem of discontinuous scanning geometry of the multi-source CT is solved, the reconstruction efficiency is remarkably improved, and excessive calculation consumption is avoided. According to the method, image quality and details are guaranteed, artifacts and noise are suppressed, an efficient and convenient solution is provided for clinical application, and the method has high universality and is suitable for data processing requirements of different equipment manufacturers.

The invention discloses a thighbone tackle forming method based on 3D printing, and relates to the technical field of three-dimensional reconstruction. Comprising the steps of data collection, data preprocessing, three-dimensional model construction, parameter measurement, individualized reconstruction, osteotomy guide plate design and intraoperative forming, knee joint skeleton anatomy details are accurately obtained through spiral CT data collection, multi-step image processing and three-dimensional modeling, and the individualized reconstruction of the tackle groove based on patient individual anatomy is achieved. The curvature radius, the width, the depth and the articular surface angle of the reconstructed tackle groove are matched with the height of the patella, the operation accuracy is improved, and the problem that the patella is unstable due to maldevelopment of the tackle groove is solved; the design of the osteotomy guide plate realizes accurate conversion from virtual osteotomy to an actual operation, the binding surface of the osteotomy guide plate is tightly attached to the outer surface of the femur, the osteotomy channel is accurately matched with an osteotomy tool, the operation time is shortened, the design of the fixing holes ensures that the guide plate is stable, the osteotomy deviation risk is reduced, and the operation safety is improved.

The invention discloses a multi-modal score construction method for identifying benign and malignant pulmonary nodules and application of the multi-modal score construction method. The multi-modal score construction method comprises the steps that 1, data are collected, and data sets serve as a training set and a verification set respectively; step 2, preprocessing the collected low-dose spiral CT image; 3, aiming at the preprocessed low-dose spiral CT image, extracting marker features of the pulmonary nodule under imaging; the pulmonary nodule deep learning malignant probability is acquired, and the pulmonary lobe radiomics detection result of the participant is acquired; 4, based on the extracted pulmonary nodule features, constructing a single-mode nodule score, and verifying and evaluating a score identification effect; and step 5, constructing a pulmonary nodule benign and malignant identification multi-mode comprehensive score. According to the method, after the patient completes low-dose spiral CT or provides biological information, the individualized risk score is automatically generated, and the relative risk level in the screening crowd is visually displayed in a risk percentage mode to assist doctors in decision making and grading intervention.

The present invention relates to the technical field of osteoporosis screening, and specifically relates to a method for screening osteoporosis in patients with spinal deformities by using spiral CT images, including: scanning a number of patients with spinal deformities by a spiral CT machine to obtain the coronal CT images, sagittal CT images of the spine of each patient, and cross-sectional CT images of each vertebral node in the spine; obtaining the bone density excellence degree of each vertebral node in the spine of each patient; obtaining the abnormal degree of each intervertebral distance in the intervertebral distance sequence of each patient; obtaining the degree of influence of each intervertebral distance in the intervertebral distance sequence of each patient by osteoporosis; obtaining the osteoporosis risk degree of each vertebral node in the spine of each patient according to the degree of influence, the first degree of influence, and the degree of disruption of the bone density law; and evaluating the osteoporosis status of each patient. The present invention improves the screening accuracy of osteoporosis for patients with spinal deformities.

The present application relates to a kind of mobile high-energy industrial spiral CT systems, belong to CT technical field, solve the problem that existing CT equipment is difficult to carry out the scanning of fixed workpiece.The CT system of the present application includes: scanning system and displacement system;Displacement system can drive scanning system displacement;Scanning system includes: scanning system shell, scanning assembly, drive assembly, workpiece support structure and feeding and discharging gate;Workpiece support structure is used to support and position the workpiece to be measured;Scanning assembly is used to emit ray and scan the workpiece to be measured;Drive assembly is used to drive scanning assembly to carry out rotary motion and linear motion relative to the workpiece to be measured;Feeding and discharging gate can be opened or closed, and then the workpiece to be measured can be placed inside workpiece support structure or taken out from workpiece support structure.The present application realizes the synchronous realization of the rotation and displacement of scanning assembly, can carry out real-time scanning to fixed piece, and overcome the limitation of CT machine use site.

A scanning method and image reconstruction method for a continuous tilted linear scan variable-pitch spiral CT, belonging to the field of ray tomography technology, includes the following steps: S1: the radiation source is translated along an inclined linear trajectory with an axial tilt angle γ(t), while the flat-panel detector remains stationary, completing a segment of the tilted linear scan in the tth scan cycle; S2: the radiation source and detector assembly are translated axially relative to the object being measured by an angle interval h(t), while the object is rotated by an angle interval Δθ; S3: the tilted linear scan in S1 is continued; this process is repeated until the variable-pitch spiral scan trajectory covers the object being measured. The reconstruction method includes: S1': obtaining a three-dimensional DBP image of the nth segment of the tilted linear scan using a differential backprojection operator; S2': performing a one-dimensional finite Hilbert inverse transform on the nth segment of the DBP image along the axial direction layer by layer; and S3': accumulating the reconstruction results of all segments of the tilted linear scan. The present invention can achieve variable-pitch scanning and imaging of long and transversely truncated and axially truncated objects, with high resolution and ease of implementation.

The application provides a multi-modal CT image data fusion three-dimensional reconstruction method for puncture positioning, constructs a high-dimensional feature space containing anatomical structure, metabolic activity and time-varying information through characteristic coding of spiral CT and multi-phase PET data; realizes modality alignment by using a mutual information driven double constraint registration mechanism, and completes cognitive level fusion of cross-modal features by combining a dynamic weight tensor of patient physiological characteristics, clinical requirements and organ semantics; and finally generates a three-dimensional reconstruction model with medical accuracy and clinical guidance by adaptive light field rendering and topology preservation optimization, so as to provide precise visualization support for puncture surgery.

The invention discloses a spiral CT image reconstruction method based on a nerve radiation field, and belongs to the field of computer vision. The method comprises the following steps: determining an original projection image of a scanned object; the original projection image is acquired by spiral CT equipment in a fan beam scanning mode; according to the sampling angle corresponding to the original projection image, classifying and splicing the original projection images with the same sampling angle in each cycle of the rotation process through the rotation direction to obtain a spliced projection image; based on the spliced projection image, calling an image reconstruction model to generate a spiral CT image; wherein the image reconstruction model is constructed and trained based on a neural radiation field. According to the method, the radiation risk of related personnel is reduced.

The application discloses a spiral CT image reconstruction method based on a neural radiation field, and belongs to the field of computer vision.The method comprises the following steps: determining an original projection image of a scanned object; the original projection image is obtained by a spiral CT device through a fan-beam scanning mode; according to a sampling angle corresponding to the original projection image, the original projection images with the same sampling angle in each cycle of a rotation process are classified and spliced through a rotation direction to obtain spliced projection images; and a spiral CT image is generated by calling an image reconstruction model based on the spliced projection images; wherein the image reconstruction model is constructed and trained based on a neural radiation field.The method reduces the radiation risk of related personnel.

The utility model relates to a driving device of a spiral CT (Computed Tomography) machine, belongs to the technical field of CT driving, and solves the problem that the use scene of the spiral CT machine is limited due to the fact that the spiral CT machine in the prior art can only realize rotary motion. A driving device of a spiral CT machine comprises a rotation driving assembly and a displacement driving assembly. The rotation driving assembly and the displacement driving assembly are respectively used for driving the scanning assembly to rotate and linearly move; the rotary driving assembly is slidably mounted above the displacement driving assembly and can be driven by the displacement driving assembly to integrally move; and the spiral motion of the scanning assembly is realized. According to the driving device, rotation driving and displacement driving of the CT scanning assembly can be conducted at the same time, and then the CT scanning assembly can be driven to achieve spiral scanning.