77 results about "Ct technology" patented technology

The invention relates to a CT image reconstruction method based on GPU hardware acceleration, which belongs to the field of X-ray CT technology. The software portion of the invention generally comprises a GPU-based CT data preprocessing module, a GPU-based CT data filter module, a GPU-based CT orthogonal protection module, and a GPU-based CT image reconstruction and back projection module. The method can achieve acceleration of CT image reconstruction algorithm by using GPU hardware, and the reconstructed portion and the data processing portion are achieved on GPU. The invention provides a segmentation processing method used for processing larger data, which aims to solve the prior problems of insufficient display memory of GPU and low data transmission speed from memory to the display memory. Different from prior methods, the segmentation processing method only needs a portion of projection data desired for each segment to be reconstructed, thus reducing data transmission and improving the entire reconstruction speed.

The invention discloses a method for detecting and analyzing internal defect evolution of a metal casting in a fatigue process based on a three-dimensional industrial CT technology, and belongs to the fields of industrial CT nondestructive detection and intelligent material characterization. The method comprises a detection method and an intelligent analysis method, wherein the detection method comprises the steps of performing industrial CT scanning on an original metal sample, performing fatigue loading test after scanning, designing a clamp for fixing the metal sample after the fatigue test and performing industrial CT scanning on the metal sample after the fatigue test; the intelligent analysis method comprises a method for classifying internal defects and a method for correspondingly identifying the defects before and after the fatigue test and analyzing fatigue evolution. According to the method, the three-dimensional industrial CT technology is combined with a conventional fatigue test, a detection result is analyzed by the intelligent analysis method, the evolution characteristics of different defects in a fatigue process are analyzed, a support is provided for component design and structure property analysis of the metal casting, and the application value is wide.

The invention discloses a method for manufacturing an operation auxiliary skeleton model. The method comprises the following steps that (1) according to the CT technology, skeleton three-dimensional reconstruction is carried out; (2), three-dimensional reconstruction data are made into three-dimensional printing data; (3), the skeleton model at the ratio of 1:1 is manufactured according to the 3D printing technology; (4), cleaning and completing are carried out on the printed model. The method for manufacturing the operation auxiliary skeleton model has the advantages that the operation auxiliary skeleton model is made of non-toxic polylactic acid material, and therefore the operation auxiliary skeleton model is environmentally friendly; the operation time is shortened, the bleeding amount of a patient is reduced, and the probability of complications is reduced; the visibility is higher, direct simulation of treatment can be conducted, an operation plan can be discussed, and operation risks are more controllable; more powerful assistance is provided for post-operation analysis and medical appraisal; restoration analysis of the skeleton is achieved by medical colleges, diversified cases are provided, and theories and reality are combined; a great number of potential clients exist in the aspect of the application of the method, and the market application prospect is broad.

Discloses are an improved device-less 4 dimensional-computed tomography (D4D-CT) imaging method, device and system. The method comprises the steps of determining lung zoom values on collected CT slices of a patient's lug area; generating a respiration curve of the patient according to the lung zoom values; and selecting the collected CT slices on the basis of the generated respiration curve so as to be used for D4D-CT imaging. Under the conditions that an external respiration monitoring device is not needed, the appropriate CT slices can be selected to be used for D4D-CT imaging, so that artifacts caused by the respiration curve of the patient in prior art of D4D-CT are removed, and quality of D4D-CT images is improved.

The invention discloses an NMR relaxation semaphore calibrating device and method for an aquo-complex sediment by combining an X-CT technology. The device comprises a reaction kettle, an NMR testing system, an X-CT scanning system, an aquo-complex synthesizing system, a temperature pressure control system and a vacuumizing saturated system. The vacuumizing saturated system is connected to the reaction kettle for vaccumizing saturated treatment of the sediment in the reaction kettle. The NMR testing system and the X-CT scanning system are used for scanning and testing microporous structures ofthe aquo-complex sediment and analyzing the behavior characteristics of the aquo-complex sediment in pore scale in the forming and decomposing processes. By means of the device, calibration of nuclearmagnetism transverse relaxation semaphore and the behavior measurement and analysis in the pore scale can be integrated, thereby laying a technical foundation for discussing a micromechanism of basicphysical parameter change of the aquo-complex sediment.

The invention belongs to the technical field of scientific research of oil and provides a method for measuring capillary pressure of a CO2-saline-core system based on an X-ray CT technology. The measuring method disclosed by the invention comprises the following four steps: measuring CO2-saline interfacial tension, performing core displacement and CT scanning, performing CT image processing and measuring the capillary pressure. By utilizing the X-ray CT technology, the method disclosed by the invention has the characteristics of relatively high resolution and capacity of performing nondestructive testing on samples, is capable of accurately, conveniently and really measuring the capillary pressure of the CO2-saline-core system in different flow conditions, and can measure local core capillary pressure and overall core capillary pressure, so that the measurement scale reaches the pore scale. Moreover, the measuring method can be popularized to measuring the capillary pressure of any gas-liquid porous medium system or liquid-liquid porous medium system.

The invention discloses an MEMS structure three-dimensional reconstruction and detection method based on CT scanned images. The MEMS structure three-dimensional reconstruction and detection method based on the CT scanned images aims to solve the problems that an existing detection means has high requirements for detection environment and can not reflect three-dimensional shapes of MEMS structures, and meanwhile guarantees nondestructive testing of an MEMS. According to the method, firstly, serial images of an MEMS device are obtained in a scanning mode by adopting the industrial CT technology; secondly, the images are processed and volume data of the images are obtained, surface modal reconstruction is carried out according to the volume data and a surface triangular mesh model of the MEMS device is obtained; then, the surface model is repaired, feature information of the surface model is recognized and extracted, and different features of the device model are classified into different feature blocks; finally, fitting is carried out on the classified feature blocks, feature parameters are extracted and data interface files are educed. Through the technical means, accurate detection of the three-dimensional structure of the MEMS structure is achieved.

The invention discloses an X-ray two-dimensional phase-contrast imaging method of single exposure. The method specifically includes following steps: during imaging, a detected object is arranged between a first encoding diaphragm M and an area array detector and close to the first encoding diaphragm M, the change of the intensity and the direction of the X-ray is caused by absorption and refraction of the X-ray by the detected object, the ray intensities I1, I2, I3 and I4 detected by pixels of the detector are changed, quantified phase and absorption information can be extracted by employing relative changes thereof, and two-dimensional phase-contrast imaging of the X-ray of single exposure is realized. The beneficial effects of the method are that the acquisition process is simplified, original secondary exposure is simplified as single exposure, the imaging time and the irradiation dose are reduced by 50% compared with that of the original method, the mode of single exposure can realize dynamic and online phase-contrast imaging, the realization of the phase-contrast CT technology of the X-ray is facilitated, two-dimensional phase-contrast imaging can be realized, and the object detail distinguishing capability and the defect detection capability are improved.

The invention relates to the technical field of computed tomography (CT), in particular to a CT imaging method. The CT imaging method comprises the following steps: performing full-dose scanning before interventional therapy and reconstructing to obtain a full-dose image; after the interventional therapy begins, partially scanning a region of interest (ROI) comprising needle point position and reconstructing to obtain an ROI image; and merging the full-dose image and the ROI image. By the CT imaging method, the ROI is partially scanned after the interventional therapy begins, so the radiation dose is greatly reduced compared with full-dose scanning adopted in the prior art.

Nanoparticles for thrombus-targeting and thermal-ablation are disclosed. According to the nanoparticles, the surface of nanoparticles with a photothermal conversion function is grafted with long-circulation hydrophilic functional group and thrombus-targeting functional group. The nanoparticles has a long-circulation effect in blood vessel and is targeted and enriched at the thrombus position. The nano-core of the nanoparticles has a photothermal conversion effect, the shell has long-circulation and thrombus-targeting functions, and particle size of the nanoparticles is 2-500 nm. The nanoparticles have a core-shell structure. The core is nanoparticles with the photothermal conversion function, and contains nonstoichiometric tungsten oxide nanoparticles or gold nanoparticles. The composite nanoparticles can circulate long in the blood vessel and are targeted and enriched at the thrombus position. By development under a CT technology, thrombus can be accurately positioned. Near infrared light with high skin permeability irradiates at the position of thrombus positioned by CT, and photothermal conversion is carried out. Then, local temperature of thrombus rises, and thermal-ablation of thrombus is carried out to achieve the thrombolysis effect.

The invention discloses a low-dose CT image restoration and denoising method. The method comprises the following steps: simulating and generating a low-dose CT image required by training; performing fan-shaped beam projection transformation on the high-dose CT image to obtain projection data of a projection domain, performing exponential operation on an obtained projection matrix, adding Poisson noise, taking a logarithm, and converting the simulated projection data back to the image domain through a built-in back projection function of MATLAB to obtain a simulated low-dose CT image. Accordingto the low-dose CT image restoration and denoising method disclosed by the invention, the conversion from the low-dose CT image to the high-dose CT image is efficiently realized; detail parts on theCT image are effectively recovered, meanwhile, the complexity of the network can be reduced, the network training is accelerated, the reconstruction efficiency is improved, and the harm of the CT technology to a patient can be effectively reduced under the condition that the diagnosis of a doctor is not influenced.

The invention discloses a check system for inspection and quarantine and an inspection and quarantine method. The CT technology is applied to the field of quarantine supervision, the problem of single-visual-angle or multi-visual-angle X-ray machine image-object overlapping is solved, meanwhile, the problems that organic matter, containing inspection and quarantine prohibited goods, in common CT images is not prominent, not exquisite and poor in contrast ratio are solved, the accuracy and efficiency of quarantine workers for checking target objects are greatly improved, and very high actual application value is achieved.

The invention disclosesa method for distinguishing an aquo-complex phase from a water phase through CT scanning, and belongs to the technical field of chemical engineering and petrol engineering. The method for distinguishing the aquo-complex phase from the water phase with the CT technology includes the steps that gray level distribution generated before an aquo-complex is generated in a container is obtained with the imaging technology, gray level distribution generated after the aquo-complex is generated in the container is obtained, the area of the generated aquo-complex is obtained, and therefore the aquo-complex phase and the water phase are distinguished; finally, the decomposition process of the aquo-complex is quantitatively obtained through a formula. By means of the method, the area of the generated aquo-complex can be accurately determined, the position of the aquo-complex and the position of water are visibly determined accordingly, and the distinguishing effect is quite good accordingly; in addition, changes of the saturation degree in the decomposition process of the aquo-complex are calculated, and therefore the decomposition process of the aquo-complex is quantitatively analyzed.

The invention discloses a method and a device for utilizing an electromagnetic wave CT technology to detect pile side and pile tip caves. The method comprises the steps of: after pile concrete of bored piles reaches an age, selecting a plurality of bored piles in a detected field for carrying out full-length core drilling, and obtaining a plurality of full-length core drilling holes; selecting two full-length core drilling holes to respectively serve as an emitting hole and a receiving hole, putting an emitting probe and a receiving probe of an electromagnetic wave instrument respectively into the emitting hole and the receiving hole; selecting a fixed-point and horizontal observation mode, and reading and recording electromagnetic wave signals through the electromagnetic wave instrument; and according to the detection result of the electromagnetic wave instrument, obtaining the positions, sizes, and forms of pile side caves and pile tip caves. The device comprises the electromagnetic wave instrument, the emitting hole, the emitting probe, the receiving hole and the receiving probe. The method and the device have the advantages that with the emitting probe and the receiving probe moving in the full-length core drilling holes, the distribution condition of the pile side caves and the pile tip caves in the whole filed is rapidly, effectively and economically known.

The invention discloses a three-dimensional measurement method for chalkiness of rice based on Micro-CT (Micro-Computed Tomography), which comprises the following steps: S1, scanning a rice sample byutilizing a Micro-CT technology to obtain tomography data of rice; and S2, processing and analyzing the acquired data, reconstructing a three-dimensional image, and further calculating the chalkinessdegree of the rice. The processing and analysis process in the step S2 comprises the following steps: carrying out data processing by utilizing Mimics Innovation Suite Research 19.0 software, and reconstructing a three-dimensional image; and after image reconstruction, respectively obtaining the volume of whole rice and the chalkiness, and calculating the chalkiness degree of the rice. The three-dimensional measurement method for chalkiness of rice based on Micro-CT can accurately reflect the chalkiness character, position and volume, can realize three-dimensional measurement of chalkiness ofliving rice, and can obtain a more accurate rice chalkiness measurement value.

In one embodiment, the invention provides a modeling method for vascular bundle model of maize leaves, wherein the method includes steps of: 1) with ethanol solutions in increasing concentrations, performing multi-dehydration to a maize leaf or a maize leaf section; 2) soaking the dehydrated maize leaf or maize leaf section in an iodine contrast agent to dye the raw materials, wherein the iodine contrast agent is an I2-KI ethanol solution; 3) with CO2 critical point drying method, drying the dyed maize leaf or a maize leaf section, and based on CT technology, acquiring the vascular bundle model of maize leaves. According to the embodiment, the maize leaves are subjected to multi-dehydration with the ethanol solutions in increasing concentrations, so that complete dehydration is ensured; bymeans of dyeing with the iodine contrast agent, recognition degree on vascular bundles is increased; with the CO2 critical point drying method for drying the sample, a problem of drying deformation of the maize leaves is solved; and after drying, high-quality vascular bundle model of the maize leaves can be obtained through CT scanning.

The invention discloses a test device and method for testing material damage. A drop hammer impact apparatus is ingeniously applied to simulate the impact effect of an impact load when the material damage characteristic is researched under the action of the impact load, so that the damage law of the material under the action of the impact load is more conveniently and quickly obtained. Ultrasonicdetection of impact damage has high sensitivity, and is conducive to comprehensive understanding of the destruction mechanism of a jointed rock mass under the action of the impact load. CT imaging iscarried out on a test piece before and after impact by applying a CT technology, the destruction range and the damage degree of the material under the action of the impact load are analyzed, and a basis is provided for further researching the damage mechanism of the material under an impact condition. Fatigue degradation of the material is diagnosed macroscopically and microscopically, and the long-term stability of the material in engineering is scientifically evaluated.

The invention relates to a visual test device and a visual test method for the influence of temperature change on a subway tunnel. The visual test device comprises a model box system, a water supplementing system and a temperature control system which are communicated with the model box system, a roadbed simulation system and a subway tunnel model which are arranged in the model box system, and aCT measurement system which is arranged outside the model box system. The visual test method comprises the following steps: 1) preparing transparent soil; 2) paving permeable stones at the bottom andside walls of a transparent model box, laying transparent soil in layers, and arranging the subway tunnel model; 3) fixing and sealing the transparent model box; 4) respectively communicating the transparent model box with a low-temperature constant-temperature tank, and communicating the permeable stones with a water supply mechanism; 5) setting test conditions; and 6) starting the test, collecting and organizing data. In comparison with the prior art, the visual test device and the visual test method of the invention have the beneficial effects that: the transparent soil is adopted to simulate a natural soil body and a CT technology is combined to perform detection, so as to realize qualitative analysis and quantitative analysis of a test result, and obtain a settlement rule of the subway tunnel under different temperature changes.

The invention discloses a method for carrying out deep brain nucleation positioning by using a quantitative magnetic susceptibility map, which uses a high-resolution QSM technology to obtain a quantitative magnetic susceptibility map of a head, can display a clear deep brain nuclei contour exceeding that of a traditional MRI method, and especially can distinguish thalamus bottom nuclei from blackmatter. A traditional CT image and a traditional T1 image can conduct spatial positioning on skull and grey matter, a quantitative magnetic susceptibility image, the CT image and the high-resolution T1 image are used in a combined mode, and deep brain nuclei can be accurately positioned. The method has the characteristics that the advantages of the QSM technology and the CT technology are integrated, and the accuracy of nucleus positioning is improved through clear brain deep nucleus imaging; the method does not depend on a specific machine type, is suitable for various commercial magnetic resonance devices, and is convenient to popularize.