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35 results about "Ct measurements" patented technology
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Ct = Carat, abbreviated "ct." and spelled with a "c" is a measure of weight used for gemstones. One carat is equal to 1/5 of a gram (200 milligrams). Stones are measured to the nearest hundredth of a carat.
System and method for performing material decomposition using an overdetermined system of equations
InactiveUS20090080597A1Error minimizationReconstruction from projectionMaterial analysis using wave/particle radiationDecompositionData acquisition
A system and method of a diagnostic imaging system includes an x-ray source that emits a beam of x-rays toward an object to be imaged, a detector that receives x-rays emitted by the x-ray source and attenuated by the object, and a data acquisition system (DAS) operably connected to the detector. A computer is operably connected to the DAS and programmed to obtain a number of measurements of energy-sensitive CT measurements in excess of a number of materials to be resolved, decompose the number of measurements into individual materials as an overdetermined system of equations, and generate an image of the individual materials based on the decomposition.
Owner:GENERAL ELECTRIC CO
Integration of quantitative calibration systems in computed tomography scanners
ActiveUS20150173703A1Material analysis using wave/particle radiationRadiation/particle handlingX-rayComputing tomography
An embodiment in accordance with the present invention provides a device and method for a quantitatively calibrated computed tomography scanner. The device includes a gentry configured for receiving a patient or part of a patient. The gentry includes an X-ray source and a detector positioned opposite said X-ray source, such that said detector receives the X-rays emitted from the X-ray source. Calibration phantoms are integrated with the gentry and / or a device within the scanner so as to allow for calibration in quantitative CT measurements of Hounsfield units and / or bone mineral density.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Three-dimensional precision measurement and calibration method for industrial CT (computed tomography)
InactiveCN103558237AEasy to fixReduce refractionMaterial analysis by transmitting radiationVoxelDimensional modeling
The invention discloses a three-dimensional precision measurement and calibration method for industrial CT (computed tomography). The three-dimensional precision measurement and calibration method comprises two parts, namely industrial CT scanning parameter optimization and three-dimensional precision industrial CT measurement and calibration. According to the method, the conventional technology is innovatively optimized on the basis of a large quantity of laboratory researches and industrial applications aiming at three important processes, including setting of main scanning parameters, correction of a ray beam hardening phenomenon in a three-dimensional reconstruction process and voxel dimension and boundary definition calibration in a three-dimensional modeling and precision measurement process, which affect the three-dimensional industrial CT measurement quality. According to the method, the precision and the stability of the three-dimensional industrial CT measurement can be greatly improved, so that the applications of the three-dimensional industrial CT measurement in the fields of precision measurement and control, three-dimensional modeling, quantitative and qualitative analysis of internal and external structures of complicated machinery, reverse engineering and the like can be greatly expanded.
Owner:谭晔
Measurement of renal extraction fraction using contrast enhanced computed tomography
ActiveUS20050090736A1Ultrasonic/sonic/infrasonic diagnosticsVolume/mass flow measurementRenal veinExtraction Fraction
Renal extraction fraction (EF) is determined through use of computed tomography (CT) measurements of arterial blood before and after injection of a radiographic contrast agent into the blood and CT measurements of renal vein blood after injection of the radiographic contrast agent.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
X-ray ct device
ActiveUS20130308746A1Accurate measurementChange sizeMaterial analysis using wave/particle radiationRadiation/particle handlingRotation velocitySpin axis
In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.
Owner:HITACHI LTD
X-ray CT (Computed Tomography) measurement system for gas-water relative permeability
The invention provides an X-ray CT (Computed Tomography) measurement system for gas-water relative permeability, and belongs to the technical field of CO2 capture and storage. The X-ray CT measurement system comprises a sand filling pipe, a saline water / CO2 injection system, an X-ray CT imaging system, a computer data acquisition system, a liquid conveying system, a temperature control system, a vacuum pipe and a back pressure valve. A main body of the sand filling pipe is in an aluminum alloy structure so as to enhance the penetration of X-ray; upper and lower flange discs of a core barrel are in stainless steel structures and can be detached freely. The upper and lower flange discs are provided with dense stainless steel wire meshes so as to prevent sand from flowing into an experiment device. Sealing rings are arranged at the butt-joint parts of the upper and lower flange discs and the main body of the sand filling pipe and are used for sealing the sand filling pipe and the experiment device. According to the X-ray CT measurement system, the saturation level and the relative permeability of each phase of two-phase flows of CO2 and saline water in a porous medium can be measured efficiently and reliably; the interference problems of various influence factors in a measurement process of the saturation level and the relative permeability of the two phases including the CO2 and the saline water are solved.
Owner:DALIAN UNIV OF TECH
Integration of quantitative calibration systems in computed tomography scanner
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Correcting method aiming at CT ray hardening in multi-phase flow system
ActiveCN101639453ASave manpower, material and financial resourcesExcellent hardening correction parametersComputerised tomographsTomographyField dataComputer science
The invention provides a correcting method aiming at CT ray hardening in a multi-phase flow system, which comprises the following steps: 1) using fluid dynamics software to generate a simulated flow field of the multi-phase flow system; 2) selecting one two-dimensional section of the simulated flow field to acquire flow field data of the two-dimensional section; 3) selecting materials and thicknesses of different filter plates, and simulating a process of scanning the two-dimensional section by CT to acquire simulated two-dimensional reconstructed images corresponding to the materials and thethicknesses of the different filter plates respectively; and 4) determining the materials and the thicknesses of the filter plates required during actual CT measurement according to the similarity ofthe simulated two-dimensional reconstructed images and the simulated flow field data. The correcting method has the advantages that the defect that the precise repeatable flow field cannot be producedin a physical experiment can be overcome by combining computational fluid mechanics and CT simulation; and the hardening correcting parameters of a CT system can be determined through computer simulation so as to save a large amount of manpower, materials and financial resources.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
X-ray CT device
InactiveUS9155508B2Accurate measurementChange sizeMaterial analysis using wave/particle radiationRadiation/particle handlingX-ray generatorPhysics
In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.
Owner:HITACHI LTD
CT measurement with multiple X-ray sources
A method is disclosed for reconstructing image data of an examination object (O) from measurement data of a computed tomography system, the examination object (O) having been irradiated simultaneously by a number of X-ray sources while the measurement data was being acquired so that different projections of the examination object (O) associated with the number of X-ray sources (C2A, C2B) were acquired simultaneously for each detector element. In at least one embodiment, different iteration images of the examination object are determined one after the other from the measurement data by way of an iterative algorithm, a computation operation being employed with the iterative algorithm, which is applied to the iteration images and takes the presence of the number of X-ray sources (C2A, C2B) into account.
Owner:SIEMENS AG
Multi-optical-path, cross-scale and high-resolution micro-CT detection instrument
ActiveCN106290417AExpand the sampling rangeImprove the measurement effectMaterial analysis by transmitting radiationFlat panel detectorImage resolution
The invention relates to a multi-optical-path, cross-scale and high-resolution micro-CT detection instrument. The detection instrument comprises a base, a sample carrying rack, regulation sliding rails, a closed pipe radiation source, a transmission target open pipe radiation source, a radiation source switching sliding table, a detector regulation sliding table, a detector switching sliding table, a flat panel detector and a high-resolution detector group. When the CT detection instrument is used, an operator can regulate the relative positions of the radiation sources and the detectors in the horizontal and vertical direction, the transmission target open pipe radiation source and the flat panel detector can form a CT measurement system, the closed pipe radiation source and the high-resolution detector group can form a CT measurement system, and the combination mode is flexible and convenient; accordingly, the detection instrument can adapt to higher-resolution measurement (restricted to the micro-CT field), multiple optical paths are combined to adapt to samples of different sizes and measurement with different resolution requirements, the micro-CT sample detecting range is greatly widened, and the micro-CT measurement capacity is greatly enhanced.
Owner:天津三英精密仪器股份有限公司
Integration of quantitative calibration systems in computed tomography scanners
An embodiment in accordance with the present invention provides a device and method for a quantitatively calibrated computed tomography scanner. The device includes a gantry configured for receiving a patient or part of a patient. The gantry includes an X-ray source and a detector positioned opposite said X-ray source, such that said detector receives the X-rays emitted from the X-ray source. Calibration phantoms are integrated with the gantry and / or a device within the scanner so as to allow for calibration in quantitative CT measurements of Hounsfield units and / or bone mineral density.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Systems and methods for the inspection of contact lenses
An apparatus for inspecting lenses includes an inspection system including an open cuvette, a communicatively coupled CT measurement device, and a user interface communicatively coupled to the inspection system. According to one embodiment, the lens inspection system provides a single instrument for inspecting the quality of a lens, thereby minimizing the transference of the lens from one inspection component to another.
Owner:MENICON SINGAPORE PTE LTD
X-ray CT apparatus
InactiveUS7046758B1High resolutionNarrow widthMaterial analysis using wave/particle radiationRadiation/particle handlingX-rayPhysics
Both an X-ray source and an X-ray detector are moved in a pitch which is smaller than a width of this detector. Since both the X-ray source and the X-ray detector are rotated by an angle of 360° within one move distance, a CT measurement is carried out. An X-ray detection amount of a slice width narrower than an X-ray effective detection width is calculated based upon the X-ray detection amount measured in the above-described manner.
Owner:HITACHI MEDICAL CORP
Intramedullary fixation guider
InactiveCN102100580AEasy to controlReduce surgical riskSurgeryAnatomical structuresThree dimensional ct
The invention relates to the field of medicine, and discloses an intramedullary fixation guider. In the invention, data at both a nail insertion point A and a nail withdrawal point B can be acquired according to the measurement result of preoperative three-dimensional reconstruction CT (Computed Tomography), wherein the nail insertion point A can be directly located according to the mark on the body surface due to the shallow and easily-exposed position of the nail insertion point A. Then, the nail withdrawal point B is located by using the locator according to the CT measurement data, and a guide bar is utilized to connect the nail insertion point A and the nail withdrawal point B. The three-dimensional CT scanned data is used, and the nail withdrawal point is determined by the locator so as to determine the nail withdrawal direction of the guider, thereby accurately controlling the injection and withdrawal routes of the nail. Since the injection and withdrawal routes of the nail are ensured by a precision instrument instead of the experience of the operator, the intramedullary fixation guider can maximally prevent the nail in the penetration process from mistakenly entering the hip joint or mistakenly penetrating the cortex of bone to damage important anatomical structures, such as nerves, blood vessels and the like.
Owner:王治 +2
Monitoring method for CT measurement winding disconnection and three-phase current imbalance operation
InactiveCN110927627AGood effectSolve runnabilityCurrent/voltage measurementElectric winding testingElectric power equipmentPower equipment
The invention discloses a monitoring method for CT measurement winding disconnection and three-phase current imbalance operation. The monitoring method comprises the following steps that (1) adding aCT current disconnection and three-phase imbalance monitoring program to a dispatching automation system; (2) judging the starting conditions of the CT current disconnection and three-phase imbalancejudgment program, and starting the corresponding judgment programs; (3) if the starting conditions of the CT current disconnection and three-phase imbalance judgment program are met, judging whether the following alarm logic judgment conditions are met or not, and if the corresponding alarm logic judgment conditions are met, sending out a CT current disconnection alarm or a CT current imbalance alarm. A regulation and control watch keeper can immediately discover the abnormal operation state of the power equipment by dispatching the CT current disconnection alarm or the CT current imbalance alarm sent by the automatic system, monitoring of CT measurement winding disconnection and three-phase current imbalance operation is achieved, and monitoring is convenient.
Owner:广西电网有限责任公司防城港供电局
Computed tomography device with active adaptation of the measuring electronics
ActiveUS20100111247A1Dose of X-radiationReduce doseRadiation/particle handlingComputerised tomographsEngineeringElectron
A computed tomography device (CT device) includes a user interface, via which the standard settings characterizing the CT measurement can be performed. At the same time, in a method and a computed tomography device for carrying out this method, filtering behavior of the filter electronics is adapted to the configuration of the standard settings by the system computer.
Owner:SIEMENS HEALTHCARE GMBH
Compound thermo-sensitive liposome used for thermal targeted chemotherapy and preparation method thereof
InactiveCN101889980AAvoid side effectsReduce heat damagePharmaceutical non-active ingredientsAntineoplastic agentsSide effectSystemic chemotherapy
The invention provides a compound thermo-sensitive liposome containing a CT contrast agent and tumor chemotherapy medicaments, and a method for preparing the compound thermo-sensitive liposome. The novel compound thermo-sensitive liposome provided by the invention can be applied to thermal targeted chemotherapy, particularly thermal targeted chemotherapy at CT measurement and control temperature, can make the temperature control of thermal therapy more accurate, greatly reduce the side effect of the thermal therapy and the thermal injury to normal tissues, and improve the effect of the thermal therapy; meanwhile, the synchronous thermal targeted chemotherapy obviously enhances the effect of the thermal therapy and reduces the toxic and side effects of systemic chemotherapy; therefore, the compound thermo-sensitive liposomes has good social benefit.
Owner:天津市第一中心医院 +1
Magnetic controllable reactor excitation current monitoring device and method based on Hall transformer
ActiveCN109709385AAvoid distortionEasy to implementTransformers/inductances coils/windings/connectionsTransformers/inductances magnetic coresTransceiverHigh pressure
The invention relates to the technical field of a magnetic controllable reactor and particularly relates to a magnetic controllable reactor excitation current monitoring device and method based on a Hall transformer. The device includes a Hall sensor HW1, a Hall sensor HW2, a Hall sensor HW3, a sampling conditioning board, a first optical transceiver, a second optical transceiver and a controller,wherein the Hall sensor HW1 is mounted between a cathode of a thyristor K1 and a tail end of a lower winding, the Hall sensor HW2 is mounted between a cathode of a thyristor K2 and a tail end of an upper winding, the Hall sensor HW3 is mounted between a first end of the upper winding and an anode of a diode D1, the sampling conditioning board includes an adjustment filter circuit, and an output end of the adjustment filter circuit is connected with the controller through the first optical transceiver and the second optical transceiver. The device is advantaged in that a problem of secondary side current distortion caused by long-term magnetic biasing during ordinary electromagnetic current transformer CT measurement is avoided, a secondary circuit is easily isolated from the primary sidehigh voltage, and easy mounting, low cost and high measurement accuracy are realized.
Owner:杭州银湖电气设备有限公司
Method for improving fluid saturation precision in CT (computed tomography) measurement
InactiveCN105717274AImproved Saturation AccuracyHigh measurement accuracyPreparing sample for investigationEarth material testingSaline waterFluid saturation
The invention discloses a method for improving the accuracy of CT measurement of fluid saturation, comprising the following steps: S1, sampling: taking a rock core sample, drying the rock core sample through a dryer, so that the water content of the rock core sample is 0.01-1 %, placed in a vacuum environment after drying; S2, one-time treatment: place the dried core sample in a core holder, inject 100% saturated brine into the core, and continue at a temperature of 40-60°C After 1-2 hours, measure the volume of saturated brine to obtain the volume of saturated brine; S3, secondary treatment: the core sample uses oil flooding water to create irreducible water, so that the core sample is in the state of irreducible water, and the outlet end of the core holder The water output and oil output are measured, and the volume of bound water is calculated according to the water output and oil output; S4, measurement. The method of the invention is simple, suitable for practical application, can greatly improve the accuracy of CT measurement of fluid saturation, and is suitable for popularization.
Owner:尹喜玲
A Correction Method for CT Radiation Hardening in Multiphase Flow Systems
ActiveCN101639453BExcellent hardening correction parametersSave manpower, material and financial resourcesComputerised tomographsTomographyDimensional simulationBeam hardening
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Measurement of renal extraction fraction using contrast enhanced computed tomography
Renal extraction fraction (EF) is determined through use of computed tomography (CT) measurements of arterial blood before and after injection of a radiographic contrast agent into the blood and CT measurements of renal vein blood after injection of the radiographic contrast agent.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
An application of ct to measure co in porous media 2 - Method of change in brine interface area
ActiveCN107290358BAvoid interferenceEfficiently characterize nonlinear relationshipsMaterial analysis using wave/particle radiationUsing wave/particle radiation meansSaline waterPorous medium
The invention relates to a method for measuring area changes of CO2-saline water interfaces in a porous medium by using a CT. The method comprises the steps of firstly preparing saline water containing potassium iodide to strengthen the image contrast of CO2-saline water; continuously scanning by using the CT to obtain unsteady-state porous medium images under the CO2-saturated condition and different injection conditions; removing a noisy point by using a filter and carrying out threshold processing to generate binary images only containing 0 and 1 of saturated CO2 and under different injection conditions; carrying out subtraction on two image stacks to obtain distribution areas of the saline water in the binary images; extracting the edges of the distribution areas of the CO2 and the saline water and determining a union set to generate binary image slice stacks of the CO2-saline water interfaces; obtaining the area changes of the CO2-saline water interface in the porous medium under different injection conditions through determining and measuring the area of disconnected CO2-saline water interfaces; and calculating the saturability of the saline water in each image slice stack and obtaining area change characteristic parameters of the CO2-saline water interfaces under different injection conditions through induction.
Owner:DALIAN UNIV OF TECH
A current transformer secondary current amplification coil
ActiveCN104064340BThe voltage phase angle does not changeImprove measurement efficiencyTransformersTransformers/inductances coils/windings/connectionsPhase currentsCapacitance
This application discloses a secondary current amplification coil of a current transformer, which is used in the CT vector measurement of the secondary side of the current transformer in the power system power generation process. The coil body, and the two ends of the wire are free ends with a length of N. When the secondary side CT vector measurement is performed under the condition of no-load operation of the transmission line, the current measured by the clamp phase meter through the coil body is M times the capacitive current generated to the ground under no-load conditions, and the phase The current measured by the meter meets the accuracy requirements, and the phase angle of the measured voltage remains unchanged. It can be seen that the secondary current amplification coil of the current transformer disclosed in this application can also perform CT on the secondary side under the condition of no-load operation of the transmission line. Vector measurement does not require switching operations, thereby improving measurement efficiency.
Owner:STATE GRID CORP OF CHINA +1
A Measuring Method of Industrial CT Geometric Dimensions Based on Image Restoration
ActiveCN105222730BFuzzy Degradation Effect SuppressionGood measurement accuracy of geometric dimensionsUsing wave/particle radiation meansDimension measurementBeam hardening
The invention discloses an image restoration-based industrial CT geometric dimension measurement method, which overcomes the problem that some industrial CT geometric dimension measurement methods still need to be improved in the prior art. The specific steps of the invention are as follows: (1) acquisition of projection data; (2) reconstruction of CT image after beam hardening correction; (3) calculation of two-dimensional PSF; (4) image restoration; (5) geometric dimension measurement. Compared with the prior art, the image restoration-based industrial CT geometric dimension measurement method of the present invention has the following advantages: the fuzzy degradation effect of the CT image restored by the inventive method can be effectively suppressed, and a better geometric dimension can be obtained measurement accuracy.
Owner:THE PLA INFORMATION ENG UNIV
An x-ray CT measurement system for air-water relative permeability
ActiveCN103616321BGuaranteed image qualityPermeability/surface area analysisPorous mediumData acquisition
Owner:DALIAN UNIV OF TECH
Visceral organ tissue high-identification imaging method and device, storage medium and computer equipment
PendingCN111968061AReduce radiation doseTube requirements are lowImage enhancementImage analysisNerve networkVisceral organ
The invention discloses an visceral organ tissue high-identification imaging method and device, a storage medium and computer equipment. The method comprises the steps: obtaining CT measurement data of a single kVp; performing data correction processing on the CT measurement data to obtain corrected CT measurement data; inputting the corrected CT measurement data into a converged first neural network model to generate and output a CT bone image or a soft tissue image. In the method disclosed in the embodiment of the invention, a high-quality CT bone image or soft tissue image can be obtained only by inputting conventional single-kVp CT measurement data, the efficiency is high, and the radiation dose of a patient is reduced.
Owner:广州海兆印丰信息科技有限公司
Computed tomography device with active adaptation of the measuring electronics
ActiveUS8005183B2Dose of X-radiationReduce doseRadiation/particle handlingComputerised tomographsEngineeringUser interface
Owner:SIEMENS HEALTHCARE GMBH
Method for calibrating CT measurement data by using profile measurement data
The invention provides a method for calibrating CT measurement data by using profile measurement data, and belongs to the technical field of industrial CT nondestructive testing. In allusion to the problems that industrial CT measurement errors are complex in source and difficult in traceability, according to the actual situation that appearance measurement instruments are multiple in variety and easy to obtain, by means of the characteristics of high precision and high reliability of appearance measurement data, the measurement deviation of CT is obtained by measuring the geometric dimensions of the same part of parts, and then the CT measurement precision is improved by adopting a mode of firstly measuring and then calibrating or firstly calibrating and then measuring. The method does not need to develop special standard parts, is not influenced by factors such as part materials, structures and sizes, is wide in applicability, and can effectively improve the precision and reliability of CT measurement results.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Non-scanning method for acquiring CT (Computer Tomography) projection data
The invention relates to a non-scanning method for acquiring CT (Computer Tomography) projection data, and the non-scanning method is suitable for measuring sectional images of a measured object which is in rapid change and rapid motion and inappropriate for long-term beam irradiation. According to the non-scanning method for acquiring the CT projection data, the measured object and a plurality of CT measurement components are not required for rotation and translation. The CT measurement components consist of linear diffusion beam sources, beam deflectors and planar detectors; beams shot from the linear diffusion beam sources pass through the measured object and are then deflected by the beam deflectors; two-dimensional flux density distribution is formed on the planar detectors; the two-dimensional flux density distribution comprises a number of groups of parallel beam lines, a number and spacing distance of the parallel beam lines of each group, and projection angle information corresponding to the parallel beam lines of each group; and the information is the CT projection data. One CT measurement component can be used for measuring data in a range of a certain projection angle, and a CT measurement system consisting of the CT measurement components can be used for measuring the projection data in the range of 180 DEG. When pulse beams are used, the pulse duration is beam irradiation time.
Owner:吴桂琴
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