47 results about "X ray nanotomography" patented technology

The invention relates to a computer image processing field and the embodiment of the invention discloses a three-dimensional visualization method and an apparatus. The method includes: the CT image is preprocessed to highlight the image of an interested area; according to an image feature of an interested tissue, the image of the interested area is segmented to get the image of the interested tissue in the area; the tissue image comprising other tissues to be segmented inside is processed mathematically and morphologically; according to the image of every tissue, a three-dimensional reconstruction is made to obtain a three-dimensional image. The application of the technical proposal of the embodiment of the invention is capable of making the image data of a human body of an individual visualized, and helpful to show relations of spatial positions of each tissue accurately.

The invention relates to a fully-automatic nondestructive high-flux measurement system and a fully-automatic nondestructive high-flux measurement method for phenotype parameters of potted rice. The measurement system is controlled by a programmable controller, a conveying line conveys the potted rice, an X-ray imaging system shoots a rice tomography image, a three-dimensional visible light imaging system shoots a visible light image, a work station processes the obtained images, and all parameters of the rice are obtained. A new method for determining rice tiller number by X-ray tomography imaging is implemented, all parameters are extracted and integrated in a system, and a first set of fully-automatic, high-flux, multi-parameter and high-precision potted rice phenotype parameter automatic extraction system is successfully established.

The invention discloses a knowledge base-based three-dimensional X-ray computed tomography (CT) detection system. The system comprises a data acquisition module, a slice reconstruction module, an image segmentation module, an image registration module, a defect detection module and a knowledge base management module, wherein the data acquisition module is used for acquiring CT projection data; the slice reconstruction module is used for reconstructing a two-dimensional slice according to the acquired CT projection data and recovering a slice CT image; the image segmentation module is used for segmenting the CT image information of an important part of the chip for the slice CT image; the image registration module is used for performing registration on the CT image to be detected and the standard CT image and finding out the correspondence between the two to realize comparability of the corresponding parts; the defect detection module is used for extracting CT image characteristic of a chip to be detected, comparing with corresponding characteristic of the standard CT image of the chip in a knowledge base and judging whether the chip to be detected is defective and judging the type of the defect. The system and the method are accurate in defect positioning and high in quality detection accuracy.

A system for low dose x-ray imaging provides for dynamic generation of an x-ray beam with specific shape, and dynamic tracking of a detector with said beam. The detector is rotatable, and translatable along two orthogonal axes, and may mount with a circular detector tray, the tray rotating around a rotation axis. Specific detector shapes include an elongated rectangular matrix, for example with additional detector cells near the rotation center to provide an increased area of continuous detection. Dynamic low-dose x-ray tomosynthesis or limited-angle tomographic imaging is enabled via simultaneous x-ray tube and detector motions during examination, such as fluoroscopic examination of a human body. Data acquired at multiple projection angles is input to a 3D image reconstruction algorithm that provides a refreshed 3D data set during continuing examination. The system may thus also automatically track a point in three-dimensional space, for example continuously locating the tip of a catheter.

The invention discloses a method for enhancing medical X-ray image display effect, and relates to a digital image technology. The image enhancing method is completed through the following methods and steps: image pyramid (funnel-shaped) decomposition, excessive contrast inhibition, detail contrast enhancement, edge enhancement, noise suppression and pyramid (funnel-type reconstruction). By adjusting the pixel dynamic range distribution of an image, the method improves the detail signal of the image, enhance the contrast, the clarity and the permeability of the digital image, suppress the noise, and realize the effect of image organization edge contrast improvement, organization detail performance and permeable and visible overall image organization. The method for enhancing medical X-ray image display effect is particularly applicable to computer-controlled X-ray CT scanners or medical radiation image processing systems.

An apparatus for providing an integrated tri-modality system includes a fluorescence tomography subsystem (FT), a diffuse optical tomography subsystem (DOT), and an x-ray tomography subsystem (XCT), where each subsystem is combined in the integrated tri-modality system to perform quantitative fluorescence tomography with the fluorescence tomography subsystem (FT) using multimodality imaging with the x-ray tomography subsystem (XCT) providing XCT anatomical information as structural a priori data to the integrated tri-modality system, while the diffuse optical tomography subsystem (DOT) provides optical background heterogeneity information from DOT measurements to the integrated tri-modality system as functional a priori data. A method includes using FT, DOT, and XCT in an integrated fashion wherein DOT data is acquired to recover the optical property of the whole medium to accurately describe photon propagation in tissue, where structural limitations are derived from XCT, and accurate fluorescence concentration and lifetime parameters are recovered to form an accurate image.

The invention discloses a medical image segmentation algorithm and relates to the field of digital image processing technique. The medical image segmentation algorithm includes the steps of selection of an area of interest, arrangement of an initial clustering center, clustering segmentation and connectedness adjustment. In the segmentation algorithm, the area of interest and nearby areas are segmented and divided into a series of homogeneous small areas, follow-up processes can be directly operated at the level of the homogeneous areas instead of single pixel, so that calculated amount is greatly reduced, execution is quickened, and result is accurate. The medical image segmentation algorithm is especially suitable for operations of tissue positioning, measuring, identifying or classifying of a computer controlled X-ray computed-tomography scanning device or a medical radioactive image processing system.

The invention provides a surface strengthening method capable of reducing the porosity of a laser additive member. The method comprises the following steps: carrying out X-ray computerized tomographic scanning on the surface of a component produced through laser additive manufacturing to detect pore distribution in the component; coating the surface of the component with an absorbing layer, applying a water restraining layer via a water coating robot and allowing the laser to enter Standby (a ready mode) for subsequent laser shock; and inputting pore parameters into an industrial control computer and allowing the industrial control computer to apply different energies, frequencies, power densities and pulse widths onto different laser shock areas according the distribution and sizes of pores. The method can effectively reduce porosity of the laser additive member or the surface layer or sublayer of a laser weld and is capable of refining the crystal grain of a structure and improving the mechanical properties of the member.

The invention relates to a reconstruction algorithm for back projection weight cone-beam CT, belonging to the field of X-ray computed tomography. The reconstruction algorithm comprises the following steps of: introducing a ray back projection weight based on a filtering back projection reconstruction frame, acting the back projection weight based on distance and continuity of conjugate rays on filtered projection data during back projection so as to reconstruct a CT image, and performing certain compensation on Radon missing data to improve the intrinsic cone-beam artifact problem of an FDK (Feldkamp-Davis-Kress) algorithm under circular track and increase the reconstruction quality. According to the reconstruction algorithm disclosed by the invention, the frame based on the filtering back projection has simple and efficient reconstruction process and is insensitive to noise.

The invention pertains to a biomedical engineering field, particularly a novel contrast agent which is suitable for a plurality of imaging models; the novel contrast agent is constructed by porphyrin and derivative(s) thereof and / or phthalocyanin and derivative(s) thereof combining with acoustic contrast agent. When in use, the novel contrast agent is systemically or partly acted on target tissue, which can intensify the effects of X ray, ultrasonic, computer X ray tomoscan (CT), magnetic resonance imaging and optical imaging for the target tissue.

The invention discloses a microstructure detection method for freezing-thawing damage of cement-based materials. According to the microstructure detection method for the freezing-thawing damage of the cement-based materials, the freezing and thawing cycle experiment method conforming to the national standard is not adopted, microstructures of the cement-based materials before and after the freezing-thawing damage can be obtained by changing the surface sealing states of the cement-based material test samples and freezing and thawing cycle systems, and utilizing a microstructure detection measure, namely an X-ray tomography imaging technology, wherein the surface sealing states include full epoxy resin sealing, half epoxy resin sealing, full preservative film package no preservative film package and no sealing, and the freezing and thawing cycle systems include gas freezing and thawing, oil freezing and thawing, and single-surface water freezing and thawing, and microfracture information caused by the freezing and thawing cycle can be quantitatively analyzed, so that the basis is provided for the mechanism research of freezing-thawing damage of the cement-based composite materials.

The invention discloses a method for detecting the internal structure of cement graded crushed stones for a high-speed rail roadbed. Three-dimensional reconstruction and analysis are conducted on spatial distribution of the cement graded crushed stones by adopting an X-ray tomography technique. The method comprises the steps that crushed stone aggregate of various particle sizes is screened and proportioned according to a crushed stone grading curve, graded crushed stones, cement, water and the like are uniformly mixed to be shaped and then subjected to standard curing, and a scanning sample is prepared by adopting a core boring sampling method; related parameters of scanning equipment are adjusted; distribution of different phases in the cement graded crushed stones is obtained by combining CT image analyzing and processing software according to the differences of grey values, and then three-dimensional reconstruction is conducted on the internal structure of the cement graded crushed stones. A more efficient, practical and accurate method for analyzing the internal structure of the cement graded crushed stones for the high-speed rail roadbed is provided. Compared with other methods, the method is novel, the spatial resolution is high (can be within 1 micrometer), the practicability is high, the precision is high, and three-dimensional reconstruction of the structure can be accurately conducted.

A system for low dose x-ray imaging provides for dynamic generation of an x-ray beam with specific shape, and dynamic tracking of a detector with said beam. The detector is rotatable, and translatable along two orthogonal axes, and may mount with a circular detector tray, the tray rotating around a rotation axis. Specific detector shapes include an elongated rectangular matrix, for example with additional detector cells near the rotation center to provide an increased area of continuous detection. Dynamic low-dose x-ray tomosynthesis or limited-angle tomographic imaging is enabled via simultaneous x-ray tube and detector motions during examination, such as fluoroscopic examination of a human body. Data acquired at multiple projection angles is input to a 3D image reconstruction algorithm that provides a refreshed 3D data set during continuing examination. The system may thus also automatically track a point in three-dimensional space, for example continuously locating the tip of a catheter.

The present invention provides an X-ray attenuation correction method, image generating apparatus, X-ray CT apparatus, and image generating method for correcting for the attenuation of X-ray beam at the boundary where the X-ray absorption rate of a subject is changing. Boundary information comprised of the boundary position where the X-ray absorption rate is changing and the magnitude of change is extracted from the projection information of the subject, then the boundary information is used to multiply the amount of scattered X-ray by the amount corresponding to the magnitude of change at the boundary position, to correct for the attenuation of X-ray at the boundary position. The attenuation of X-ray at the boundary position may be corrected for along with the scattered X-ray correction of the projection information, allowing alleviating artifacts developed in a tomographic image.

The invention discloses a concrete pore feature extraction method and system. The extraction method includes scanning permeable concrete by using an X-ray tomography, and obtaining a permeable concrete sectional image; performing binary processing on the permeable concrete sectional image, and determining a pore distribution binary image; performing three-dimensional reconstruction processing on the pore distribution binary image, and establishing a pore three-dimensional reconstruction model; and extracting concrete pore features according to the pore three-dimensional reconstruction model and the pore distribution binary image. The extraction method and system can perform nondestructive testing on concrete, so that the accuracy of extracting pore features can be enhanced.

The invention provides an X-ray tomography method, which comprises the following steps: by controlling voltage between the cathode and the grid of a field emission unit of a multi-focal spot X-ray source, controlling the multi-focal spot X-ray source to emit X-rays to a detected object from different emission source positions to perform scanning; receiving the X-rays transmitting the detected object by utilizing a flat panel detector to obtain X-ray projected images at multiple angles; collecting data of the X-ray projected images, and performing reconstruction on the collected data to obtain the faulted image of the detected object. By adopting the method, not only can the spatial resolution be improved but also the scanning speed can be increased; moreover, the invention also provides an X-ray tomography system.

The invention provides a method and a system for nondestructively detecting a laminated lithium ion battery. The method comprises the following steps: sequentially emitting X-rays to every layer of cell electrode sheets of the laminated lithium ion battery, wherein the incident direction of the X-rays is parallel to the every layer of cell electrode sheets of the battery to be detected, and the X-rays scan around the cell electrode sheets in different directions; sequentially acquiring the intensities of the X-rays emitted from different directions and encircling the every layer of cell electrode sheets before and after penetrating the every layer of cell electrode sheets and the thickness of the every layer of cell electrode sheets; and determining the attenuation coefficient of the X-rays at each point on the every layer of cell electrode sheets according to the acquired intensity of the X-rays and the thickness of the every layer of the cell electrode sheets, and generating a two-dimensional image of the every layer of cell electrode sheets and a three-dimensional image of the laminated lithium ion battery. The method scans the cell electrode sheets of the laminated lithium ionbattery based on an X-ray tomography technology to realize the online monitoring of the state of the battery.

An embodiment of the invention discloses an X-ray source array and an X-ray computed tomography system and method. The X-ray source array comprises a plurality of individually packaged cold cathode X-ray source bulb tubes, and the arrangement track of each cold cathode X-ray source bulb tube is arc-shaped. The X-ray computed tomography system comprises the X-ray source array and a detector, and the center of a circle of the arrangement track of the X-ray source array is positioned on the detector, so that the distances from the cold cathode X-ray source bulb tubes at different arrangement positions in the X-ray source array to the surface of the detector are the same. Besides, according to the X-ray computed tomography method, the tube current of the cold cathode X-ray source bulb tube isconsistent, and the dosage of different-angle X-ray sources to a target object tends to be consistent.

The invention discloses a method for detecting the internal crack developing of a cement-based material under the action of load. The method comprises the steps of loading a sample of the cement-based material by an X-ray computed tomography scanning microscopic material test pull pressure instrument, and scanning the sample by a three-dimensional reconstruction imaging X-ray microscope to obtain the image of crack developing of the longitudinal section and / or the transverse section of the sample under the action of pressure. After the method is adopted, the common problems of poor accuracy, low reliability, poor intuition and the like of the conventional testing measures can be solved, the direct, reliable and visual feedback result of the influence on the internal crack of the cement-based material under the action of load can be realized, and an effective method and basis are provided for the detection and study of the internal crack developing of the cement-based material under the action of load.

The present invention relates to an x-ray detector system for a computed tomography scanner. The x-ray detector system includes at least one detector row which includes a plurality of detector modules each having a plurality of detector elements. Along the at least one detector row, a first portion of the detector elements is arranged in a grid at a first grid spacing a1 in relation to its respective neighboring detector elements, and a second portion of the detector elements is arranged in a grid at a second grid spacing a2 in relation to its respective neighboring detector elements.

The invention discloses a virtual X-ray imaging method and a virtual X-ray imaging system for a human body bone joint. The method comprises the steps that computed tomography (CT) is conducted on a targeted limb; the limb is converted into a data set formed by coordinates of a volume unit and an X-ray absorption rate; a course that a ray reaches an imaging plain through the limb is simulated by a numerical algorithm; visualization treatment is conducted on a numerical result; a gray level image that can be identified by a human eye is generated; and the result is outputted. For orthopedic and radio-diagnosis doctors, X-ray images generated by projection to the limb from any angles can be generated; the orthopedic and radio-diagnosis doctors can be assisted in learning X-ray anatomy, and establishing cognition connection between a three-dimensional structure and a two-dimensional image; for a radiographer, influences of different shooting parameters and a body position of an examined person on final imaging can be simulated; the method and the system contributes to learning a radiography technology of the radiographer; and for a special disease, the method and the system can assist in screening the optimal X-ray radiography body position and the angle for clinical reference.

The invention relates to the field of 3D (three-dimensional) printing additive manufacturing and powder metallurgy, and provides a calibration method and device for hollow powder in metal powder. Themethod comprises the following steps of selecting and loading the same batch of quantitative metal powder into a container, obtaining a three-dimensional image of the metal powder loaded in the container by using an X-ray computerized tomography scan manner, analyzing holes in the three-dimensional image, judging spherical and near-spherical holes as the hollow powder of the metal powder, judgingother holes with irregular shapes as interspaces between powder, and obtaining a hollow rate of the metal powder according to the quantity of hollow metal powder and data of the three-dimensional image. By sampling and containing the quantitative metal powder through using the container, and then obtaining the three-dimensional image through X-ray computerized tomography scan, the hollow situationof all metal powder in a sample can be obtained, a detection result can be used for accurately embodying the hollow rate of the whole batch of metal powder, and the operation is simple and efficientin the whole detection process.

The invention relates to a system and a method for scanning an X-ray faultage by an electronic computer. The system comprises an X-ray source, a collimator, a turntable, a detector and a processor, wherein an X-ray source comprises focal spots with certain lengths and a ray outlet; the collimator comprises a shielding part and a transmitting part; a tested object is loaded at the upper surface of the turntable; a center shaft of the turntable passes through the center of the turntable; the detector comprises more than one detection unit which is arranged in a straight line; the collimator is arranged between the ray outlet and the tested object; the shielding part has shielding effect on the X ray emitted by a part of focal spots; the transmitting part has transmitting effect on the X ray emitted by another part of focal spots; each detection unit is connected with the processor; and a count value which is in direct proportion to the strength of the received X ray is transmitted to the processor as projection data; and a computerized tomography (CT) image of the tested object is built according to an adsorption parameter of the collimator and each projection data. The space resolution of the CT system can be improved by the invention.

An X-ray tomographic scanner comprises a ray source, a flat panel detector, a detection bed and a collection computer, wherein the ray source emits X-rays, the flat panel detector receives the X-rays, converts the X-rays into electric signals and is connected with the collection computer, and the detection bed supports a patient; a fixed support is arranged around the detection bed, a contact slip ring is arranged at the inner side of the fixed support, the ray source and the flat panel detector are fixedly arranged on the contact slip ring and arranged opposite with the same diameter and rotate synchronously, the contact slip ring rotates around the detection bed, and a movement detection device is arranged over the fixed support. Images collected by the ray source and the flat panel detector during rotation are two-dimensional projection, and the two-dimensional projection is reconstructed in a three-dimensional mode through the collecting computer to obtain three-dimensional images used for diagnosis of doctors. The use ratio of the X-rays is higher, the speed of collecting data is higher, and movement of the patient can be monitored at all times through the movement detection device.

An X-ray tomograph comprises an X-ray generator having a function of moving the focal position and radiating X-rays toward a subject, an X-ray image receiving element for receiving transmission images created by X-rays radiated from the X-ray generator, and an image processing section for creating a tomographic image by processing the transmission images of the subject received by the X-ray image receiving element. A stereoradioscopic image constructing equipment comprises the X-ray tomograph and a stereoradioscopic image constructing section for creating a stereoradioscopic image by subjecting the created tomographic images to image processing. By using the X-ray tomograph, a tomographic image can be created without providing any high-precision movable mechanism, and a tomographic image of even a soft subject can be correctly created.

A tomograph which determines projection data phase range capable of back projection for each reconfigured voxel with an arbitrary value larger than π so that the absolute values of cone angles at the ends of this phase range is minimized, calculates an approximate straight line for a curve indicating the position of a radiation source with respect to the channel direction position of parallel beam projection data obtained by a parallel beam of a parallel shape viewed from the go-around axis direction generated from the radiation source, and based on the determined projection data range capable of back projection, three-dimension back projects the parallel beam projection data subjected to filter processing created through a filter correction to the back projection region corresponding to the region in concern along the approximate irradiation trace of the radiation beam calculated using the calculated approximate straight line, thereby suppressing generation of the distortion attributed to data discontinuity, simplifying an arcsin calculation and significantly increasing the processing speed of the tomograph.

The invention belongs to the technical field of X ray imaging and provides an X ray tomography method and system. The method comprises the steps that a controller starts X ray sources in a multi-focal-spot X light source array one by one according to a preset scanning mode to carry out pulse emission in scanning, and controls a current X ray source to irradiate a scanned object according to a preset pulse exposure time such that the surface doses on the scanned object cast by the X ray sources on different arrangement positions converge; a detector collects projection images after the X ray sources on the different arrangement positions irradiate the scanned object and transmits the projection images to terminal equipment; and the terminal equipment reconstruct the three-dimensional image of the scanned object according to the projection images. According to the method and the system, the quality of the projection images is adjusted through controlling a pulse exposure time, compared with a mode of adjusting tube current, the hardware cost is low, the adjustment precision is high, and the overall radiation dose of a scanning process can be effectively reduced under the premise of ensuring imaging quality.

Enhancement of the resolution of tomograms obtained by conventional scanning (axial scanning), cine-scanning, helical scanning or variable-pitch helical scanning by the X-ray CT apparatus using a multi-row X-ray detector or a two-dimensional X-ray area detector of a matrix structure is to be realized by a simple method. An X-ray CT apparatus is realized in which a multi-row X-ray detector or a two-dimensional X-ray area detector of a matrix structure with a small amount of processing work, and image reconstructing device capable of providing high-resolution tomograms by image reconstruction is provided.

The invention discloses a microstructure detection method for freezing-thawing damage of cement-based materials. According to the microstructure detection method for the freezing-thawing damage of the cement-based materials, the freezing and thawing cycle experiment method conforming to the national standard is not adopted, microstructures of the cement-based materials before and after the freezing-thawing damage can be obtained by changing the surface sealing states of the cement-based material test samples and freezing and thawing cycle systems, and utilizing a microstructure detection measure, namely an X-ray tomography imaging technology, wherein the surface sealing states include full epoxy resin sealing, half epoxy resin sealing, full preservative film package no preservative film package and no sealing, and the freezing and thawing cycle systems include gas freezing and thawing, oil freezing and thawing, and single-surface water freezing and thawing, and microfracture information caused by the freezing and thawing cycle can be quantitatively analyzed, so that the basis is provided for the mechanism research of freezing-thawing damage of the cement-based composite materials.