116 results about "Micro ct" patented technology

The invention relates to a method for remodeling a three-dimensional pore structure of a core. The method comprises the following steps of carrying out high-resolution three-dimensional micro-CT (Captive Test) on a full diameter core so as to generate full diameter core CT data; selecting a core matrix from the full diameter core to carry out a higher-resolution three-dimensional micro-CT or a casting sheet experiment so as to obtain the information of a pore structure of the matrix; obtaining a secondary three-dimensional pore structure through three-dimensional CT remodeling by utilizing the full diameter core CT data; obtaining the three-dimensional pore structure of the matrix through the three-dimensional CT remodeling by utilizing the obtained information of the pore structure of the matrix or through geological statistics remodeling by utilizing sheet images; integrating the three-dimensional pore structure of the full diameter core with the three-dimensional pore structure of the matrix so as to obtain a three-dimensional fine pore structure of the core, which is provided with both secondary pore characteristics and matrix pore characteristics; and obtaining parameters of pore structures with different dimensions of the core and parameters of connectivity of three-dimensional space according to the three-dimensional fine pore structure of the core.

The present invention provides internal gain charge coupled devices (CCD) and CT scanners that incorporate an internal gain CCD. A combined positron emission tomography and CT scanner is also provided.

The invention discloses a method for determining an optimal saturation computing model for a typical reservoir and belongs to the technical field of evaluation on an oil / gas reservoir. The method comprises the following steps of: according to core and well-logging data of an oil / gas reservoir section, selecting a typical whole-diameter core and performing micro-computerized tomography (CT) scanning on the whole-diameter core and an electric petrophysical experiment on the reservoir condition; according to the core and well-logging data, analyzing the characteristics of the reservoir section in which the whole-diameter core exists and the characteristics of pore structures; by using the micro-CT scanning results, determining the type of the reservoir in which the whole-diameter core exists; according to the type of the reservoir in which the whole-diameter core exists, selecting the optimal form of the saturation-computing model; and according to the results of the electric petrophysical experiment, determining the undetermined parameters in the optimal form of the saturation-computing model. The method disclosed by the invention overcomes the key difficulty in determining the saturation-computing model in the prior art, greatly improves the saturation-computing precision for common reservoirs, particularly heterogeneous complicated reservoirs and has obvious effect in the field application to the oil field.

The invention discloses a multispectral pore structural analysis-based saturation determining method which comprises the following steps of: carrying out micro CT (Computer Tomography) scanning and imaging on a rock core of a typical rock sample; quantitatively extracting a pore radius distribution spectrum of the typical sample in a three-dimensional space; acquiring the pore structure characteristic of the typical rock sample according to a nuclear-magnetism T-2 spectrum of the typical rock sample; generating a porosity distribution spectrum of the typical rock sample according to electric imaging log data of the typical rock sample; jointly determining the pore structure type of the typical rock sample according to the pore radius distribution spectrum, the nuclear-magnetism T-2 spectrum and the electric imaging porosity distribution spectrum; and determining a saturation model corresponding to the typical rock sample according to the pore structure type of the typical rock sample and determining the saturation of an oil-gas storage and collection layer in which the typical rock sample is positioned according to the saturation model.

The invention discloses a method for carrying out scanning reconstruction on a long target object by using a Micro-CT imaging system. The method is characterized by comprising the following steps of: (1) beginning to prescan from an initial position of an object to a final position thereof to obtain a projected image of the whole object; (2) selecting an interested region as a scanning frame of a reconstruction range region from the projected image of the object, segmenting the scanning frame, and calculating corresponding segmented actual position information of the projected image from the segmented reconstruction region; and (3) adjusting the position of an object table to the upmost segment of the segmented reconstruction region of the object to be acquired, scanning each segment in sequence, carrying out reconstruction on each segment, splicing the segmented reconstruction sequences, and finally obtaining a tomograph of the long target object. A great deal of scanning reconstructions prove that the method is effective to the scanning reconstruction of the long target object, effectively solves the defect that the long target object can not carry out the scanning reconstruction completely, is stable and reliable, and has great using prospect.

The invention discloses a quantitative optical molecular tomographic device and a quantitative reconstruction method. The molecular tomographic device comprises a bioluminenscent tomographic data acquisition platform, a Micro CT (Computerized Tomography) system, a quantitative calibration system and a quantitative reconstruction computer, wherein the bioluminenscent tomographic data acquisition platform is used for capturing the distribution condition of bioluminescent light sources emerging on the body surface of a small animal, and the Micro CT system is used for acquiring the anatomical structure information of the small animal body. The quantitative reconstruction method comprises a quantitative method of a receiving light source based on a field of view and a reconstruction method based on a finite element subdivision network. By utilizing the quantitative optical molecular tomographic device and the quantitative reconstruction method, three-dimensional light source distribution and the quantitative information of a cell number in a small animal body can be inverted through the two-dimensional light source distribution and the quantitative energy information on the surface of the small animal body.

The application discloses a three-dimensional pore scale structured grid model reconstruction method based on a rock micro CT image. According to the method, by digital image denoising and binarization processing, partitioning and extraction of pores and skeletons in the rock micro CT image are completed, and storage of image data is implemented in a form of a three-dimensional array matrix; and on the basis of a corresponding relationship of model grid unit bodies and image pixels in the aspect of space positions, independently developed codes are utilized to complete search and space position calibration of the pixels of pore phases and skeleton phases, a structured network mode of the skeletons and the pores is constructed by adopting the grid unit bodies with the same sizes with the pixels, and a final model obtained by surface grid growth and geometric remodeling can be directly used for numerical calculation. The three-dimensional pore scale structured grid model reconstruction method disclosed by the invention improves the defects of poor grid quality, distorted topological structure and the like of a conventional reconstructed model, can meet numerical simulation requirements of problems of seepage, deformation, heat transfer and the like, and has the important significance for promoting researches in the related fields of energy mining and geotechnical engineering.

The present invention relates to an apparatus for simulating a water-rock reaction, and a method for simulating a water-rock reaction by using the apparatus. The apparatus comprises: a micro CT scanning system; a reaction kettle arranged inside the micro CT scanning system; a fluid injection system connected to the inlet of the reaction kettle; a fluid ion test analysis system connected to the outlet of the reaction kettle; and a data collecting and processing system for collecting the data of the micro CT scanning system and the fluid ion test analysis system. According to the present invention, the apparatus can monitor the dynamic process of the water-rock reaction, can perform real-time in-situ image monitoring on the water-rock reaction, can real-timely monitor the diffusion distribution trend, the saturation distribution and other parameters of the fluid in the pores, and can provide important scientific significance for the monitoring of the reaction progress of the water-rock reaction experiment system and the exploration of the fluid-rock interaction law; and the method can simultaneously complete image and quantitative calculation, has high real-time online monitoring degree, and is convenient for application promotion.

The invention discloses a method for obtaining the rock micrometer-scale elasticity modulus and yield strength. The method comprises the steps that a rock micrometer indentation experiment is carriedout through a micron-sized pressure head, a load-displacement curve in the loading process is obtained, and the rock elasticity modulus under different displacement conditions can be obtained by combining an indentation experiment formula; micro-CT scanning is carried out on a rock sample, and a finite element mesh model of a rock skeleton in an indentation area is built; the elasticity modulus obtained through the micrometer indentation experiment serves as an input parameter to simulate the rock uniaxial compression process, the model overall elasticity modulus is obtained and compared witha rock core uniaxial compression experiment, and the pressing depth RVE effectively representing the rock micrometer elasticity modulus is determined; and then, rock sample indentation experiment numerical simulation under different yield strength conditions is carried out, the simulated loading and unloading load-displacement curve is compared with the indentation experiment to be verified, and thus the rock micron-sized yield strength is determined.

The invention relates to a method for diagnosing internal damage of cereal grains based on a micro-CT (computed tomography) technology. Micro-CT equipment is utilized for performing X-ray micro-CT scanning on unhulled cereal grains, a profile scanning sequence image of a damaged grain is obtained, threshold segmentation is utilized for processing the profile scanning sequence image, three-dimensional images of a grain body and cracks are reconstructed respectively, calculation is performed with a volumetric reconstruction method to obtain the volume of a grain body target and the volume of the cracks, the internal damage degree of the grain is measured based on the volume of the grain body target and the volume of the cracks, the three-dimensional image of the cereal grain body is subjected to multi-angle profile analysis and crack three-dimensional image analysis, a distribution situation of the cracks in the cereal grain is visually represented, and the number and sectional area of cracks are quantified. Due to the adoption of the technical scheme, a structure for analyzing the internal damage degree of the cereal grains is obtained, a three-dimensional internal result image of a sample is further obtained, and the internal damage degree of the cereal grains can be quickly and accurately identified without removing cereal grain hulls and changing shapes and internal structures of the cereal grains.

The invention discloses a bionic design method of a skull tissue engineering scaffold, which comprises the following steps of: implementing three-dimensional reconstruction according to naturally aired skull micro CT (computed tomography) data to obtain a skull sample three-dimensional model; implementing statistics and analysis for the skull sample three-dimensional model to build a skull microporous structure parametric model; implementing skull scaffold bionic design through the skull microporous structure parametric model; and generating a bionic scaffold. Based on measurement of a natural skull micro CT image, the method raises three elements of a space network architecture, a cavity and a connection tube to implement the bionic design for the scaffold; an obtained internal microporous architecture is similar to a bone trabecula of a natural skull, and the average hole scale is about 500-700 microns, so that bone cell growth and climbing demands are satisfied; and moreover, the skull scaffold, obtained by intersection operation with a patch model of a coloboma part, can be matched with an adjacent part, so that the communication among holes is realized, and a bone structure of a true skull is suited better.

The invention relates to a method for constructing a porosity-controlled bionic scaffold, which comprises the following steps of: scanning the entire natural bone by using Micro-CT technology, extracting spongy bone data and reconstructing a porous structure model of a spongy bone; measuring the porosity of the spongy bone model by using Mimics; then constructing a unit body with a proper porous structure according to the porosity; processing the unit body by using an image to obtain a three-dimensional porous structure model; and finally, performing Boolean intersection operation on the three-dimensional porous structure model and a damaged bone model so as to construct a porous structure model of the bionic scaffold, which is matched with the damaged part. In the method, the porosity corresponding to the natural bone can be obtained in the process of reconstructing and measuring, the characteristics of the natural bone can be better simulated in construction, and cell adhesion, crawling and bone replacement are more convenient. The bone scaffold constructed by the method has the same outline as real bone, which better contributes to implantation of the scaffold. A parameterized construction method can adjust different porosity characteristics of different natural bones and makes scaffold construction convenient. A construction method for obtaining the unit body by processing a unit body image solves the problem of porosity communication in a microstructure.

The invention relates to a stereolithography-based process for manufacturing the porous structure of a bionic scaffold. The process comprises the following steps: scanning natural bones by Micro-CT to acquire the micro-structural model of the natural bones; further acquiring the negative-type model thereof through the Boolean operation; then, acquiring the negative-type model on a stereolithography basis; and finally pouring bioceramic slurry followed by high-temperature calcinations to obtain the controllable porous structure of the bionic scaffold. The porous structure of the bionic scaffold prepared by the method is the same as the real structure of bones; moreover, the method is even more favorable for the adhesion, creeping and osteogenesis substitution of cells.

A reconstruction method for a pore structure of a core with micro-CT (Computed Tomography) is provided. With utilizing a FIB-SEM (Focused Ion Beam-Scanning Electron Microscope) experiment, an actual porosity corresponding to a grey level in micro-CT results is obtained, so as to establish a relationship between the grey level of a micro-CT image and the porosity. Thereafter, according to the above relationship, a certain porosity is assigned to each pixel in the micro-CT image, so as to establish a soft segmentation method of the pore structure. The reconstruction method provided by the present invention discloses a soft segmentation method for digital reconstruction of the pore structure of the core combined with FIB-SEM data and micro-CT data, and establishes a fractional digital pore structure model of the core, which further improves a matching degree between the digital pore structure model of the core and an actual core.

The invention relates to a biological autofluorescence tomography method and a device based on iteration reweighting. The method adopts the scheme that by capturing photon signals emitted by tumor cells of a fluorescent protein gene, a size of a tumor focal zone in an organism can be reconstructed three-dimensionally, and positioning analysis can be performed on the focal zone by fusing organism anatomical structure information provided by Micro-CT (Micro-Computed Tomography). According to the method and the device, a non-homogeneous organism model and a photon transmission model based on a diffusion equation are established by combining function information provided by autofluorescence imaging and the structure information provided by Micro-CT imaging, and three-dimensional reconstruction of an illuminant in the organism is achieved by using a norm regularization and iteration reweighting combined optimization strategy. With the adoption of the scheme, a result closer to an actual solution can be reconstructed by less observation quantity; the computational efficiency of solving can be improved effectively; the robustness of a reconstruction algorithm can be improved; and the method and the device are suitable for practical three-dimensional detection and quantitative analysis of a tumor in the practical organism.

The invention discloses a four-point bending load tester suitable for a biological sample of micro CT, and aims to provide a four-point bending loading device which aims at the biological sample and meets the use requirements of the micro CT. The four-point bending loading device comprises a loading cavity outer cylinder, a bottom cover, a micrometer head, a shaft coupling, a sensor base, a sensor, a spacing block, a movable pressure head and a fixed pressure head. The outer cylinder is connected with the bottom cover to form a loading cavity, and the micrometer head passes through the bottom cover and is connected with the sensor base through the shaft coupling. One end of the sensor is fixed on the base, while the other end is connected with the spacing block. The spacing block applies load to the movable pressure head through an arc-shaped bulge. The spacing block, the movable pressure head and the fixed pressure head are coupled with one another to determine loading positions. The four-point bending loading device overcomes the defects of oversize and artifacts of materials in the prior art, and successfully provides a controllable four-point bending load for the biological sample inside the micro CT without generating the artifacts, so that correlative research works can be carried out.

The invention discloses a miniature single-shaft rock test machine belonging to the field of rock mechanics. The miniature single-shaft rock test machine solves the problem that the rock damage process cannot be observed in real time by combining micro CT (Computed Tomography) due to no existence of a rock test machine for loading a miniature specimen at present. The miniature single-shaft rock test machine comprises a machine body, a pressure display instrument, a manual loading device and a specimen placing device, wherein the manual loading device comprises a propelling screw rod, a displacement dial, a lower wedge body, an upper wedge body, a force sensor and an offsetting spring, and the specimen placing device comprises a specimen cylinder, a pressure steel column, a spherical washer and a top pre-tightening screw rod. The miniature single-shaft rock test machine is used for rock single-shaft compression test and can realize CT scanning while rock loading and observe the process of crack derivatization-expansion inside a rock.

Embodiments of the present invention provide methods and apparatus for imaging a tissue specimen excised during surgery with a combined positron emission tomography (PET) and micro computed tomography (micro CT) scanner. The specimen is scanned with a CT imaging system of the combined PET and micro CT scanner. The specimen is also scanned with a PET imaging system of the combined PET and micro CT scanner. A PET image is constructed based on data acquired by the PET imaging system. A micro CT image is constructed based on data acquired by the micro CT imaging system. The micro CT image includes at least one visualization of a lesion marker.

The invention relates to a method for constructing a microporous structure of a bionic support, which comprises the following steps: performing overall scanning of a natural bone by using Micro-CT technology to extract data of a spongy bone and reconstructing the spongy bone to obtain a model of the microporous structure of the spongy bone; extracting a model of a unit body from the model of the spongy bone; obtaining a model of a three-dimensional microporous structure by mirroring; and finally, performing Boolean intersection operation with the model of the three-dimensional microporous structure and a model of a damaged bone to obtain a model of the microporous structure of the bionic support matched with a damaged part. According to the design method, the amount of processed data is reduced in a reconstruction process. The design method of obtaining a large model by mirroring the unit body solves the problem of local fault in the micro structure. According to design requirements, the model of the microporous structure, which is obtained by mirroring, may have an infinite size. The microporous structure of the obtained model of the bionic support is similar to the structure of a real bone, which is more favorable for cell adhesion, cell climbing and osteogenic replacement. The bone support designed by the method has the same profile as the real bone and thus can be implanted more conveniently.

The invention provides a method for manufacturing a thin-wall metal semi-spherical shell with a seam allowance. The method comprises the steps of machining a solid metal ball, grinding and polishing the metal ball by adopting a four-axis ball body grinding method, cutting a metal semi-spherical shell through WEDM (Wire cut Electrical Discharge Machining), processing an inner semi-spherical surface by adopting EDM (Electrical Discharge Machining), correcting the wall thickness of the semi-spherical shell through a micro-CT and a small semi-spherical surface grinding technology, processing the seam allowance through EDM-mill, and obtaining the thin-wall difficult-to-process metal semi-spherical shell with the seam allowance. By adopting the method provided by the invention, the processing on an ultra-hard difficult-to-process metal material can be realized.

The invention discloses a micro-CT-based rice tillering characteristic nondestructive measurement device and a measurement method thereof. The device comprises a lifting platform, a translation platform, an object carrying rotating platform and the like; the method comprises the steps of using a mechanical arm to carry a detected sample onto the object carrying rotating platform, and the like. According to the device and the method, provided by the invention, the mechanical arm is used for completing the carrying operation, focal plane array images of the detected sample can be collected through a micro focal spot radiation source, the object carrying rotating platform and a flat panel detector, then a tomographic reconstruction image of the detected sample can be realized on the basis of a computer system, and the tillering characteristics including tiller number, stem diameter, stem wall thickness, area of marrow cavity, total area, tillering angle and the like of rice tillering can be obtained at the same time through a machine vision technology.

The invention relates to a preparation method of glucan embolism microspheres with a CT (computed tomography) visualization function. The preparation method is characterized by comprising the steps of dissolving polymethyl vinyl ether maleic anhydride grafted with beta-CD and modified glucan in water; uniformly stirring and then dropwise adding the solution into dimethyl silicone oil, wherein the volume ratio of a water phase to an oil phase is 1:5; under the condition of magnetic stirring, heating to 60-120 DEG C to react for 16-48 hours; after the reaction, standing and then removing supernatant fluid; cleaning microspheres deposited at the bottom of a container by using n-hexane; removing the remaining dimethyl silicone oil; and performing vacuum drying to remove the n-hexane on the surface to obtain gel microspheres with the particle size of 30+ / -5 microns and good dimensional homogeneity. The gel microspheres are added into a developer iodine solution or iodized oil, and the microspheres are discovered to have an obvious gray level through micro-CT observation.

The invention discloses a sandstone acid-rock reaction visualization quantitative evaluation method, which comprises: burnishing a sandstone core column sample to achieve a flat state; carrying out electron probe surface analysis, micro CT first-layer imaging and micro CT three-dimensional imaging on the burnished surface to obtain the three-dimensional image of pores and sensitive minerals, and calculating the porosity and the volume content of the sensitive minerals; carrying out acid-rock reaction simulation experiment on the sample; and carrying out electron probe surface analysis, micro CT first-layer imaging and micro CT three-dimensional imaging to obtain the three-dimensional image of pores and sensitive minerals, calculating the porosity and the volume content of the sensitive minerals after the reaction, and comparing the porosities and the volume contents of the sensitive minerals before and after the reaction. With the method of the present invention, the change of the porosity and the volume content of the sensitive minerals before and after the acid-rock reaction can be obtained, the three-dimensional spatial distribution shape of the pores and sensitive minerals canbe displayed, the acid-rock reaction action effect can be subjected to visualization quantitative evaluation, and the technical support can be provided for the oil test and producing test and the scientific, reasonable and efficient development of tight sandstone oil layers.

The invention relates to a method for extracting a natural gas hydrate reservoir pore skeletal structure. The method comprises the operation steps of firstly, using a Micro-CT technology to obtain a three-dimensional space section image of a rock core of a natural gas hydrate reservoir sample, and conducting threshold processing to obtain binaryzation image data; utilizing C++ language programming to obtain the natural gas hydrate reservoir pore skeletal structure to generate a program on the basis of the principle of a pore network model, and conducting visual generation on the pore skeletal structure by means of the Rhinoceros software. The natural gas hydrate reservoir pore skeletal structure obtained by the method well imitates characteristics of the natural gas hydrate reservoir interior pore structure, and the good geometric structure and the topological structure are beneficial to further analyzing generation and seepage characteristics of the natural gas hydrate.

The invention relates to the reservoir stratum rock core multi-organizational module constructing method based on Micro-CT technology. With the method, a Micro-CT scanning image of a rock core is used as basis; a tetrahedron model of the rock core is reconstructed through methods of image processing, surface module construction and tetrahedron partition; and a multi-organizational rock core model is established. By adopting the established multi-organizational model, the structure of the reservoir stratum rock core can be restored effectively; the accuracy of the construction result of the reservoir stratum rock core is improved; the multi-organizational model constructing method lays the foundation to the value analysis and simulation of the reservoir stratum rock core in the next step; and the method is suitable for constructing multi-organizational models of reservoir stratum rock core with complex structures and many details.

The invention discloses a bionic bat sonar experiment system device based on a multi-axis cradle head. The bionic bat sonar experiment system device based on the multi-axis cradle head comprises a bionic bat model, a mechanical main body and an electric control system, wherein the mechanical main body comprises a horizontal turntable, a U-shaped bracket and a cradle head base; and the electric control system comprises a controller, a steering engine, an ultrasonic transducer, a signal modulation circuit, an LCD display screen, a control key and a power supply. The horizontal turntable is fixed on the cradle head base; the steering engine for controlling the U-shaped bracket to swing is fixed on a turnplate of the horizontal turntable; the horizontal turntable and the U-shaped bracket are respectively driven by the independent steering engine. The LCD display screen and a control key are arranged on the cradle head base; and the controller, the signal modulation circuit and the power supply are arranged on the internal side of the cradle head base. The bionic bat model is fixedly connected to the U-shaped bracket; and micro ultrasonic transducers are mounted in an oral cavity and ear canals of the bionic bat model. A bionic bat head model adopts a three-dimensional reconstruction structure model in bat sample cross section tangential image scanned by a micro CT, is made by using a 3D printing technology and keeps the natural physiological structure of a bat. The bionic bat sonar experiment system device based on the multi-axis cradle head, disclosed by the invention, can simulate target detecting and searching functions of the bat and can be applied to teaching demonstration and scientific research related to bionic sonar.

The present invention provides internal gain charge coupled devices (CCD) and CT scanners that incorporate an internal gain CCD. A combined positron emission tomography and CT scanner is also provided.

An embodiment of the invention provides a three-dimensional modeling method for a vascular bundle of a corn stalk node, and relates to the field of botany. The method comprises the steps of S1, performing iodine staining processing on a corn stalk node sample to obtain a stained corn stalk node sample; and S2, based on the stained corn stalk node sample, performing Micro-CT scanning to obtain a three-dimensional model of the vascular bundle of the corn stalk node sample. The three-dimensional model of the vascular bundle of the corn stalk node is built through the Micro-CT scanning; paraffin sections are prepared without destroying the shape structure of the corn stalk node; the workload is small; obtained CT scanning image features are consistent; a unified image reconstruction algorithm can be used; and the precision of the obtained three-dimensional model is high.

The invention discloses a method for correcting deviation of a projected image rotating center in a Micro CT system comprising the following steps: appropriate threshold value is selected according to grayscale difference of projected images to carry out binarization treatment on the selected projected images with different angles; black pixels of the projected images after binarization treatment are measured to obtain projective centers of all projected images, and all projected images are rotated and projective centers of all projected images after rotation are obtained by measuring, thereby obtaining the rotating centers of the projected images; a valid image is determined and intercepted according to the rotating centers of the projected images and the distance of the two sides of the projected images to rebuild the image. By adopting the method, the image can be rebuilt by intercepting the valid image of the projected images according to the actual rotating center; the method has good effects and is convenient and feasible.

Embodiments of the present invention provide methods and apparatus for imaging a tissue specimen excised during surgery with a combined positron emission tomography (PET) and micro computed tomography (micro CT) scanner. The specimen is scanned with a CT imaging system of the combined PET and micro CT scanner. The specimen is also scanned with a PET imaging system of the combined PET and micro CT scanner. A PET image is constructed based on data acquired by the PET imaging system. A micro CT image is constructed based on data acquired by the micro CT imaging system. The micro CT image includes at least one visualization of a lesion marker.