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34 results about "Detector geometry" patented technology
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Low-resolution gamma energy spectrum inversion analysis process and method based on Monte Carlo response matrix
ActiveCN103853929AImprove analytical abilityX/gamma/cosmic radiation measurmentSpecial data processing applicationsGamma photonImage resolution
The invention relates to a low-resolution gamma energy spectrum inversion analysis process and method based on a Monte Carlo response matrix. The analysis process comprises the steps of detecting an instrument spectrum, constructing a geometric model of a detector, simulating a response function of the detector, extracting feature parameters of the response function, generating the Monte Carlo response matrix, and performing inversion analysis, and is specifically implemented by constructing the geometric model of the detector according to a physical process for forming the instrument spectrum, simulating the response function of an NaI(Tl) flashing detector to gamma photons by a Monte Carlo method, determining the feature parameters of the response function, constructing the Monte Carlo response matrix between a radiation source and a gamma spectrum by an interpolation algorithm, and realizing the inversion analysis on gamma instrument spectrums of other tested samples under the response matrix by a Gold or Boosted-Gold algorithm. By the application of the analysis method disclosed by the invention, the complicated processing procedures such as spectrum smoothing, peak searching and overlapped peak separation are omitted; an analysis result is a solution of a spectral line which is close to a theoretical physical spectral line under the response matrix; the spectral line analysis capacity is improved.
Owner:EAST CHINA UNIV OF TECH
Coded localization systems, methods and apparatus
ActiveUS20150219437A1Improve performanceSmall sizeImage analysisDigital data processing detailsLocalization systemDigital image
A coded localization system includes a plurality of optical channels arranged to cooperatively image at least one object onto a plurality of detectors. Each of the channels includes a localization code that is different from any other localization code in other channels, to modify electromagnetic energy passing therethrough. Output digital images from the detectors are processable to determine sub-pixel localization of the object onto the detectors, such that a location of the object is determined more accurately than by detector geometry alone. Another coded localization system includes a plurality of optical channels arranged to cooperatively image partially polarized data onto a plurality of pixels. Each of the channels includes a polarization code that is different from any other polarization code in other channels to uniquely polarize electromagnetic energy passing therethrough. Output digital images from the detectors are processable, to determine a polarization pattern for a user of the system.
Owner:ASCENTIA IMAGING
Logging tool with response invariant to changes in borehole pressure
ActiveUS20060102834A1Minimize standoff effectMinimal void spaceSurveyNuclear radiation detectionGamma rayDetector geometry
A logging system for measuring parameters of earth formation penetrated by a well borehole. Measurements made with the system are not adversely affected by varying pressure encountered a borehole environment. This is accomplished by the use of a main compensation element and a detector compensation element render source and detector geometry invariant to varying pressure. The system is particularly suited for nuclear LWD systems such as back scatter gamma ray density systems. The basic concepts of the system are, however, applicable to other types of nuclear measurement systems that comprise one or more radiation sources, and one or more axially spaced radiation detectors, where system response is a function of source-detector spacing. The basic concepts of the system are also applicable to other types of logging systems, such as electromagnetic and acoustic, where source (transmitter) and sensor (receiver) elements require invariant geometry in order to maximize accuracy of measurements.
Owner:WEATHERFORD CANADA
Semicircular inversed offset scanning for enlarged field of view 3D
InactiveUS20110255657A1Avoid radiationSimple system constructionMaterial analysis using wave/particle radiationRadiation/particle handlingRotational axisComputed tomography
A computed tomography acquisition method, an imaging system, a computer readable medium provides laterally displacing a radiation detector (204) from a position with centered detector geometry with a centered transverse field of view to a first offset position (212); emitting first radiation by the radiation source (202), detecting the first radiation by the radiation detector (204) and acquiring projection data indicative of the first radiation; rotating the support around the rotational axis (214) by 180°; emitting second radiation by the radiation source (202), detecting the second radiation by the radiation detector (204) and acquiring projection data indicative of the second radiation; displacing the radiation detector (204) from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a); emitting third radiation by the radiation source (202), detecting the third radiation by the radiation detector (204) and acquiring projection data indicative of the third radiation; rotating the support around the rotational axis (214) by 180°; and emitting fourth radiation by the radiation source (202), detecting the fourth radiation by the radiation detector (204) and acquiring projection data indicative of the fourth radiation.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Respiration correction technique in positron emission tomography
InactiveCN101702232AImprove the correct diagnosis rateCompensate for image artifactsImage enhancement3D-image renderingDetector geometryCorrection technique
The invention relates to a respiration correction technique in positron emission tomography, in particular to a technique for correcting the artifact of respiration tomography on the basis of the sensitivity characteristics of a three-dimensional positron emission detector, belonging to the field of nuclear medical tomography. The correction method provided by the invention can effectively compensate for the image artifact caused by respiration, thereby improving the diagnostic accuracy of doctors. The correction method comprises the following steps: frame segmentation is carried out on the acquired dynamic data by using the variation characteristics of the geometric sensitivity of a scanning detector in the three-dimensional PET, wherein the number of intra-frame photons can reflect the phase position of the organ motion, and the number of photons of each phase position has a linear relation with the motion displacement thereof; accordingly, each phase position is moved to certain reference phase position point for correcting; and the image reconstructed at last constitutes the image artifact caused by the respiration in the PET improved by correction. Compared with the prior art like the gating correction technique, the method of the invention dispenses with hardware equipment and extra preparation by patients or clinic before scanning, therefore, the method is easier, more effective and more reliable in actual application.
Owner:KUNMING UNIV OF SCI & TECH
Device and method for geometric correction of detector of cone-beam CT (computed tomography) system
ActiveCN103735282AFast and efficient geometric correctionEasy to operate2D-image generationComputerised tomographsX-rayDetector geometry
The invention discloses a device and a method for geometric correction of a detector of a cone-beam CT (computed tomography) system. The correction device comprises a correction board, an adjusting board, the detector, an X-ray source device and an X-ray source table, wherein the X-ray source table and the adjusting board are arranged at two ends of the correction device respectively, the X-ray source device is located on the X-ray source table, the bottom surface of the detector is placed on a horizontal table surface of the adjusting table, the correction board is arranged on the table surface of the adjusting table and positioned between the X-ray source device and the detector, a plurality of round through holes are formed in the correction board and form a through hole array, sizes of the through holes are the same, and the through holes are axially parallel. According to the device and the method for geometric correction of the detector of the cone-beam CT system, by means of the correction board with the through hole array, the detector of the cone-beam CT system can be subjected to convenient, fast, and effective geometric correction without calculation; by means of the correction board, the geometric position of the detector is firstly corrected, the position of a rotation table is subsequently corrected, and the operation is simple and fast.
Owner:PEKING UNIV
3D-2D image registration for medical imaging
A method of 3D-2D registration for medical imaging includes the following steps: providing a first input interface for acquiring a three-dimensional image; providing a second input interface for acquiring a fixed two-dimensional image using an imaging system that includes a source and a detector and that has an unknown source-detector geometry; initializing image transformation parameters and source-detector geometry parameters; generating a reconstructed two-dimensional image from the three-dimensional image using the image transformation parameters and the source-detector geometry parameters; determining an image similarity metric between the fixed two-dimensional image and the reconstructed two-dimensional image; and updating the image transformation parameters and the source-detector geometry parameters using the image similarity metric, and a corresponding non-transitory computer-readable medium and apparatus.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Autonomous attitude maneuver control method of deep space probe
InactiveCN104635740AImprove search efficiencyReduce planning timeAttitude controlSpacecraft attitude controlSpace probe
The invention discloses an autonomous attitude maneuver control method of a deep space probe, which relates to the autonomous attitude maneuver control method and belongs to the technical field of spacecraft attitude control. The autonomous attitude maneuver control method comprises the following steps of carrying out random sampling on uniformly-distributed nodes of an attitude space with an ORRT (Optimized Rapidly Exploring Random Tree) algorithm as a path planning method, making a balance and choosing the optimum path to expand, carrying out incremental expansion in a safety space in a greedy expansion manner, respectively establishing a probe attitude maneuver dynamic constraint model, an actual engineering constraint model and a probe geometric constraint model under a probe body coordinate system to obtain path nodes which meet the constraint and generate a control moment for the nodes, thereby generating a probe attitude maneuver path and a required control moment, and implementing the purpose that probe maneuvers to a target attitude according to the generated probe attitude maneuver path and the required control moment. According to the autonomous attitude maneuver control method, the path planning time is shortened and the efficiency that the probe maneuvers to the target attitude from the initial attitude is improved under the condition that all kinds of complicated constraint conditions faced by the probe are met.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Logging tool with response invariant to changes in borehole pressure
A logging system for measuring parameters of earth formation penetrated by a well borehole. Measurements made with the system are not adversely affected by varying pressure encountered a borehole environment. This is accomplished by the use of a main compensation element and a detector compensation element to render source and detector geometry invariant to varying pressure. The system is particularly suited for nuclear LWD systems such as back scatter gamma ray density systems. The basic concepts of the system are, however, applicable to other types of nuclear measurement systems that comprise one or more radiation sources, and one or more axially spaced radiation detectors, where system response is a function of source-detector spacing. The basic concepts of the system are also applicable to other types of logging systems, such as electromagnetic and acoustic, where source (transmitter) and sensor (receiver) elements require invariant geometry in order to maximize accuracy of measurements.
Owner:WEATHERFORD CANADA
A hybrid method based on simulation and experimental data to normalize PET data
ActiveCN105556342AShorten the timeReduce certification timeTomographyX/gamma/cosmic radiation measurmentData setStructure of Management Information
A medical system (28) for normalization correction of an imaging system (10) includes a detector geometry correction unit (44), a crystal efficiency unit (46), and a normalization unit (54). The detector geometry correction unit (44) mathematically calculates a detector geometry correction component for a type of scanner (12) of interest. The crystal efficiency unit (46) configured to empirically determine a crystal efficiency component for at least one individual scanner (12). The normalization unit (54) generates a normalization data set (56) which corresponds to a normalization correction factor of the at least one individual scanner (12) in accordance with the detector geometry correction component and the crystal efficiency component.
Owner:KONINKLJIJKE PHILIPS NV
Splicing detector geometry correction body model and correction method thereof
ActiveCN106447637AGuaranteed accuracyEffective correctionImage enhancementImage analysisPhoton counting detectorDetector geometry
The invention discloses a splicing detector geometry correction body model and a correction method thereof. The method comprises the following steps of S1, installing a geometry correction body model on a splicing detector top surface so that metal round dots on a geometry correction body model substrate are uniformly distributed a photon counting chip; S2, taking the photon counting chip as an unit, dividing a photon counting detector top surface into a plurality of module groups, and according to positions of the metal round dots, calculating center coordinates of all the metal round dots in each module group; S3, calculating a pixel of each module group image, according to the pixel of each module group image, determining whether a seam exists between the adjacent module groups, if the seam exists, entering into a stepS4; otherwise, the seam does not exist, the image does not need to be corrected; and S4, calculating a pixel number of the seam existing between the adjacent module groups and restoring the pixel at the seam to the image. By using the method, actual image detected by the splicing detector can be effectively corrected and image accuracy is ensured.
Owner:NANOVISION TECHNOLOGY (BEIJING) CO LTD
Optimal design method of self-powered neutron detector structure
ActiveCN107316665AImprove performanceRaise the ratioNuclear energy generationNuclear monitoringSecondary electronsDetector geometry
An optimal design method of a self-powered neutron detector structure comprises the steps of 1, selecting shape and parameters of self-powered neutron detector geometry; 2, establishing a basic geometric characteristic layer in a program; 3, imparting a material to the basic geometric characteristic layer; 4, defining energy, position and incoming direction of primary incoming neutrons; 5, adding a required physical process; 6, simulating a process where the incoming neutrons physically react with the material, recording quantity of secondary electrons drifting from an emitter or an insulator to a collector and arrival time, and outputting based on class; 7, calculating a neutron sensitivity and transient current ratio of the self-powered neutron detector; 8, saving a data point, and judging whether returning to step 2 occurs; 9, acquiring a variation curve of detector performance with detector parameters; 10, determining the structure and size of the detector as required finally in order to improve the detector performance. The method of the invention can provide professional optimal design for neuron spectrums of any reactor.
Owner:XI AN JIAOTONG UNIV
Fluorescence detector geometry
InactiveUS7251026B2Light absorptionHigh detection sensitivityRaman/scattering spectroscopyRadiation pyrometryExcitation beamPath length
Excitation light of a selected wavelength from an excitation monochromator is directed along the long axis of a flow cell containing the sample to be analyzed, generating fluorescence. An emission monochromator is positioned at right angles to the plane of the excitation monochromator and receives the fluorescence from the flow cell utilizing optical components positioned such that the entrance slit of the emission monochromator is aligned with the long axis of the emission window. The intensity of the output from the flow cell is further maximized by positioning a retro-reflecting mirror at the end of the flow channel to effectively double the path-length of the excitation beam, and a reflecting surface on the side of the cell opposite the emission window to increase the collection efficiency and thereby increase the sensitivity of the detector.
Owner:WATERS TECH CORP
Semicircular inversed offset scanning for enlarged field of view 3d
A computed tomography acquisition method, an imaging system, a computer readable medium provides laterally displacing a radiation detector (204) from a position with centered detector geometry with a centered transverse field of view to a first offset position (212); emitting first radiation by the radiation source (202), detecting the first radiation by the radiation detector (204) and acquiring projection data indicative of the first radiation; rotating the support around the rotational axis (214) by 180 DEG ; emitting second radiation by the radiation source (202), detecting the second radiation by the radiation detector (204) and acquiring projection data indicative of the second radiation; displacing the radiation detector (204) from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a); emitting third radiation by the radiation source (202), detecting the third radiation by the radiation detector (204) and acquiring projection data indicative of the third radiation; rotating the support around the rotational axis (214) by 180 DEG; and emitting fourth radiation by the radiation source (202), detecting the fourth radiation by the radiation detector (204) and acquiring projection data indicative of the fourth radiation.
Owner:KONINKLIJKE PHILIPS NV
Detector geometric correction phantom and correction method
ActiveCN109549661AMeeting the Need for Premium Image QualityImage enhancementComputerised tomographsDetector geometryCorrection method
The invention discloses a detector geometric correction phantom and correction method. The method includes the following steps: fixing the detector geometric correction phantom on a position directlyfacing a detector, and obtaining an exposed detector geometric correction phantom image; obtaining circle center coordinates of holes on the detector geometric correction phantom according to the detector geometric correction phantom image; correcting rotation angles of all detector chips according to the circle center coordinates of the holes, making all the detector chips kept at a relative level, and saving as a first correction template; calculating a gap between each adjacent detector chips according to the circle center coordinates of all the holes, and saving as a second correction template; calculating the vertical offset of each detector chip according to the circle center coordinates of all the holes, and saving as a third correction template; and completing geometric correctionof images according to all the correction templates during actual image acquisition. The correction method realizes the geometric correction of the images collected by all detector chips.
Owner:NANOVISION TECHNOLOGY (BEIJING) CO LTD
Tomography-based calibration method of geometric position relationship of X-ray machine and detector
The invention provides a calibration method of the geometric position relationship of an X-ray machine and a detector. The calibration method includes: placing at least two small balls in an imaging zone and recording the distance d between the two small balls and the distance between the two small balls and the plane where the detector is located respectively; randomly selecting one from many digital X-ray projection drawings, and recording the projection positions C and D corresponding to the position information of the two small balls A and B; estimating the initial X coordinate Px and the initial Y coordinate Py of the X-ray machine, and calculating the Z coordinate Pz of the X-ray machine according to the geometric imaging relationship; calculating the X coordinates Ax and Bx and the Y coordinates Ay and By of the two small balls according to the geometric imaging relationship and the Z coordinate Pz of the X-ray machine; obtaining the positions of the X-ray machine in the digital X-ray projection drawing according to the geometric imaging relationship by aid of the three-dimensional coordinates and the projections C and D of the two small balls A and B.
Owner:TSINGHUA UNIV
Coded localization systems, methods and apparatus
ActiveUS20170108330A1Superior in performance and size and weight and powerImage is limitedImage analysisPosition fixationLocalization systemDetector geometry
A coded localization system includes a plurality of optical channels arranged to cooperatively distribute electromagnetic energy from at least one object onto a plurality of detectors. Each of the channels includes a localization code that is different from any other localization code in other channels, to modify electromagnetic energy passing therethrough. Digital outputs from the detectors are processable to determine sub-pixel localization of the object onto the detectors, such that a location of the object is determined more accurately than by detector geometry alone. Another coded localization system includes a plurality of optical channels arranged to cooperatively distribute a partially polarized signal onto a plurality of pixels. Each of the channels includes a polarization code that is different from any other polarization code in other channels to uniquely polarize electromagnetic energy passing therethrough. Digital outputs from the detectors are processable to determine a polarization pattern.
Owner:ASCENTIA IMAGING
Methods and systems for detector gap corrections
ActiveUS20160267687A1Reduce positioningImage enhancementReconstruction from projectionDetector geometryImage reconstruction algorithm
Methods and systems are provided for correcting positional errors in an image arising from gaps in a detector assembly. In one embodiment, a method comprises generating a sinogram based on a plurality of photon coincidence events, selectively inserting one or more pseudo-slices into the sinogram, and generating an image based on the sinogram including the one or more pseudo-slices. In this way, positional errors may be reduced without modifying an image reconstruction algorithm to include a full detector geometry or modifying the detector geometry itself.
Owner:GENERAL ELECTRIC CO
Coded localization systems, methods and apparatus
ActiveUS9534884B2Superior in performance and size and weight and powerImage is limitedImage analysisPosition fixationLocalization systemDigital image
A coded localization system includes a plurality of optical channels arranged to cooperatively image at least one object onto a plurality of detectors. Each of the channels includes a localization code that is different from any other localization code in other channels, to modify electromagnetic energy passing therethrough. Output digital images from the detectors are processable to determine sub-pixel localization of the object onto the detectors, such that a location of the object is determined more accurately than by detector geometry alone. Another coded localization system includes a plurality of optical channels arranged to cooperatively image partially polarized data onto a plurality of pixels. Each of the channels includes a polarization code that is different from any other polarization code in other channels to uniquely polarize electromagnetic energy passing therethrough. Output digital images from the detectors are processable, to determine a polarization pattern for a user of the system.
Owner:ASCENTIA IMAGING
Methods and systems for detector gap corrections
ActiveUS9947116B2Reduce positioningReconstruction from projectionX/gamma/cosmic radiation measurmentDetector geometryImage reconstruction algorithm
Methods and systems are provided for correcting positional errors in an image arising from gaps in a detector assembly. In one embodiment, a method comprises generating a sinogram based on a plurality of photon coincidence events, selectively inserting one or more pseudo-slices into the sinogram, and generating an image based on the sinogram including the one or more pseudo-slices. In this way, positional errors may be reduced without modifying an image reconstruction algorithm to include a full detector geometry or modifying the detector geometry itself.
Owner:GENERAL ELECTRIC CO
Systems and methods for rotation based reconstruction for multi-column detector geometries
A radiation detector system is provided that includes plural detector units and at least one processor. The detector units are configured to acquire imaging information at plural corresponding projection angles. The at least one processor is configured to acquire projections at the projection angles; organize the projections into groups based on the projection angles; and, for each group of projections, rotate a corresponding image from an original orientation so that the group of projections are parallel to a first axis of the rotated image, convolute and sum slices from the group of projections using kernels to provide a corresponding coordinate set forward projection; perform a back projection to provide back projections; and rotate the back projections to the original orientation and sum the rotated back projections to provide a back projected transaxial image.
Owner:GENERAL ELECTRIC CO
Calibration method of geometric position relationship between X-ray machine and detector based on tomography
The invention provides a method for calibrating the geometric position relationship between an X-ray machine and a detector, which includes: placing at least two small balls in the imaging area, and recording the distance d between the two small balls and the distance between the two small balls and the detector respectively. The distance between the planes of the X-ray machine; choose one of the digital X-ray projection pictures arbitrarily, and record the projection positions C and D corresponding to the position information of the two small balls A and B; estimate the initial X coordinate P of the X-ray machine x and the Y coordinate P y , and calculate the Z coordinate P of the X-ray machine according to the geometric imaging relationship z ;According to the geometric imaging relationship and the Z coordinate P of the X-ray machine z , calculate the X and Y coordinates A of the two balls x 、A y and B x , B y ; Utilize the three-dimensional coordinates of the two small balls A, B and the projections C, D of the two small balls A, B, and obtain the position of the X-ray machine in all digital X-ray projection diagrams according to the imaging geometric relationship.
Owner:TSINGHUA UNIV
A low-resolution γ-spectrum inversion analysis system and method based on Monte Carlo response matrix
ActiveCN103853929BImprove analytical abilityX/gamma/cosmic radiation measurmentSpecial data processing applicationsGamma energyDetector geometry
The invention relates to a low-resolution gamma energy spectrum inversion analysis process and method based on Monte Carlo response matrix. The analysis process includes instrument spectrum detection, establishment of detector geometric model, simulation of detector response function, response function characteristic parameter extraction, Card response matrix generation, inversion analysis, according to the physical process of instrument spectrum formation, the geometric model of the detector is established, and the response function of the NaI(Tl) scintillation detector to the gamma photon is simulated by the Monte Carlo method, the characteristic parameters of the response function are determined, and The Monte Carlo response matrix is constructed between the radioactive source and the γ spectrum through the interpolation algorithm, and combined with the Gold or Boosted-Gold algorithm, the inversion and analysis of the γ instrument spectrum of other measured samples is realized under the response matrix. Applying the analytical method of the present invention eliminates complex processing procedures such as spectrum smoothing, peak finding, and multiple peak decomposition, and the analytical result is that the spectral line to be measured is close to the solution of the theoretical physical spectral line under the response matrix. The ability has improved.
Owner:EAST CHINA UNIV OF TECH
Electromagnetic excitation response signal mutual inductance device, detection device and detection method
PendingCN110456419AGuaranteed closeReduce manufacturing costElectric/magnetic detectionAcoustic wave reradiationDetector geometryExcitation signal
The invention relates to an electromagnetic excitation response signal mutual inductance device, a detection device and a detection method. The electromagnetic excitation response signal mutual inductance device comprises a detector and a comparator arranged in a geometric position of the detector; the detector comprises a main excitation source and a main receiving probe; the comparator comprisesa standby excitation source and a standby receiving probe; the main excitation source and the standby excitation source are connected in parallel or in series; and the main receiving probe and the standby receiving probe are reversely connected in parallel or in series. Compared with the prior art, the electromagnetic excitation response signal mutual inductance device, the detection device and the detection method have the advantages that a signal comparator is used for following the detector in real time, a primary field signal caused by a signal magnetic field is reduced in an analog circuit, no matter what the excitation signal is, the primary field signal of the excitation signal can be completely inhibited, and the device is low in manufacturing cost.
Owner:刘卫军
Optimization of the source firing pattern for x-ray scanning systems
The present application discloses a computed tomography system having non-rotating X-ray sources that are programmed to optimize the source firing pattern. In one embodiment, the CT system is a fast cone-beam CT scanner which uses a fixed ring of multiple sources and fixed rings of detectors in an offset geometry. It should be appreciated that the source firing pattern is effectuated by a controller, which implements methods to determine a source firing pattern that are adapted to geometries where the X-ray sources and detector geometry are offset.
Owner:RAPISCAN SYST INC (US)
An Optimal Design Method for the Structure of a Self-Energy Neutron Detector
ActiveCN107316665BImprove performanceRaise the ratioNuclear energy generationNuclear monitoringSecondary electronsDetector geometry
An optimal design method of a self-powered neutron detector structure comprises the steps of 1, selecting shape and parameters of self-powered neutron detector geometry; 2, establishing a basic geometric characteristic layer in a program; 3, imparting a material to the basic geometric characteristic layer; 4, defining energy, position and incoming direction of primary incoming neutrons; 5, adding a required physical process; 6, simulating a process where the incoming neutrons physically react with the material, recording quantity of secondary electrons drifting from an emitter or an insulator to a collector and arrival time, and outputting based on class; 7, calculating a neutron sensitivity and transient current ratio of the self-powered neutron detector; 8, saving a data point, and judging whether returning to step 2 occurs; 9, acquiring a variation curve of detector performance with detector parameters; 10, determining the structure and size of the detector as required finally in order to improve the detector performance. The method of the invention can provide professional optimal design for neuron spectrums of any reactor.
Owner:XI AN JIAOTONG UNIV
A mosaic detector geometric correction phantom and correction method
ActiveCN106447637BGuaranteed accuracyEffective correctionImage enhancementImage analysisPhoton counting detectorDetector geometry
The invention discloses a splicing detector geometric correction phantom and a correction method. The method includes the following steps: S1, install the geometric correction phantom on the top surface of the splicing detector, so that the metal dots on the geometric correction phantom substrate are evenly distributed on the photon counting chip; S2, take the photon counting chip as the unit, Divide the top surface of the photon counting detector into multiple modules, and calculate the center coordinates of all metal dots in each module based on the positions of the metal dots; S3, calculate the pixels of each module image, and calculate the pixels of each module image according to the position of the metal dots. The pixels of the group image are used to determine whether there are seams between adjacent modules. If there are seams, go to step S4; otherwise, there are no seams between adjacent modules and the image does not need to be corrected; S4, calculate the adjacent modules. The number of pixels that exist between the seams and restore the seam pixels to the image. This method can effectively correct the actual imaging detected by the splicing detector and ensure the accuracy of the image.
Owner:NANOVISION TECHNOLOGY (BEIJING) CO LTD
Concentric divergent light source detection method and device
PendingCN108398245AImprove image signal-to-noise ratioAgainst self-illuminationTesting optical propertiesDiffusionSmall animal
The invention discloses a concentric divergent light source detection method. The method comprises the following steps that a detector unit faces the area likely to be hit by a concentric divergent light source; by means of online or offline calculation, a time-varying position sensitivity likelihood probability function of each unit is obtained; within a given time interval, by means of first-principle computation and Monte-Carlo simulation, a joint time-varying position sensitivity likelihood function of all detectors is built; by maximizing the joint time-varying position sensitivity likelihood function of all the detectors, the central position and diffusion amplitude of a point-shaped light source are estimated, and a point-shaped light source parameter meeting maximization of the joint time-varying position sensitivity likelihood function of all the detectors serves as an estimated value of the point-shaped light source attribute. A concentric divergent light source detection device comprises a detector geometric distribution module, a photon detection unit module, a detection unit joint probability density function setting module and a joint probability density function maximization module. The method and device are specially suitable for in-vivo small animal imaging and superficial clinical diagnosis.
Owner:NANCHANG UNIV
Respiratory gating technology based on characteristic of sensitivity of three-dimensional positron emission (PET) detector
InactiveCN101658426BImprove the correct diagnosis rateCompensate for image artifactsImage enhancementRadiation diagnosticsRespiratory gatingPet imaging
The invention relates to a respiratory gating technology based on the characteristic of sensitivity of a three-dimensional positron emission (PET) detector, belonging to the field of nuclear medicine imaging. A gating method provided by the invention can effectively compensate image artifacts caused by respiration, thus improving accurate diagnostic rate of a doctor. In the three-dimensional PET imaging, the invention utilizes the change characteristic of geometric sensitivity of a scanning detector, and carries out frame segmentation to acquired dynamic data; the intra-frame photon number thereof can reflect the motion phase position where the organ motion is located; and the same positions in each circle are overlapped and the image is reconstructed, thus being capable of improving the image artifacts caused by respiration in PET imaging. Compared with the existing gating technology, the method does not relate to hardware device, does not need to make extra preparation before scanning for patients and clinics, and is simpler, more effective and more reliable in practical operation.
Owner:KUNMING UNIV OF SCI & TECH
A Method for Autonomous Attitude Maneuvering Control of Deep Space Probe
InactiveCN104635740BImprove search efficiencyReduce planning timeAttitude controlSpacecraft attitude controlClassical mechanics
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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