36 results about "X Ray Computerized Tomography" patented technology

An X-ray computed tomographic apparatus includes a gantry 100 including an X-ray tube 101 which generates X-rays and an X-ray detector 103 which detects X-rays transmitted through a subject to be examined, a reconstruction device 114 which generates tomogram data on the basis of an output from the X-ray detector, a breath detector 203 which detects a respiration waveform representing a temporal change in respiration index value associated with the subject, a regular respiration waveform generating unit 207 which generates a respiration waveform with a regular respiration cycle which originates from the detected respiration waveform, and a gantry mount display 201 which displays the generated regular respiration waveform.

The embodiment of the invention provides a rock performance evaluating device. The device comprises a pressure chamber and a CT (computed tomography) device, wherein the pressure chamber is a sealed cavity body, is positioned in the scanning range of an X-ray computerized tomography CT device, and is used for providing preset testing temperature and preset testing pressure for a rock core test specimen, wherein the preset testing temperature is higher than a first threshold, and the preset testing pressure is higher than a second threshold; the CT device is used for scanning the rock core test specimen to acquire image information of the internal structure of the rock core test specimen at different time, and analyzing according to the image information so as to obtain a strain curve of the rock core test specimen. The embodiment of the invention prevents the situation that the rock strain is measured by a sensor at high temperature, thereby measuring the rock strain simply and accurately at high temperature.

The invention relates to a three-dimensional digital imaging method of the large view field cone-beam X-ray tilting scanning of a biased detector, belonging to the technical field of X-ray computerized tomography (CT). In the three-dimensional digital imaging method, the area array detector is placed to be biased, and an X-ray source is used for generating cone-beam X-rays which irradiate a member imaging area with a certain angle in a penetrating and tilting way relative to the length and width surface of a member; in the scanning process, the X-ray source and the area array detector are static, the member rotates in an angle of 360 degrees in an equal angle and step length way surrounding a rotating shaft, and the area array detector acquires an X-ray signal modulated by the member under each rotation angle. A three-dimensional computerized tomography image of a scanning area can be reestablished and obtained by a data truncation smoothing preprocessing method and a filtering back projection reestablishing arithmetic according to data obtained by the area array detector under the scanning angle of 360 degrees. Compared with the traditional tilting scanning method, the three-dimensional digital imaging method can double the tilting scanning imaging view field without changing the system hardware and the scanning speed and has high reestablishment quality, simple process and high efficiency.

The invention discloses a nondestructive testing method of a three-dimensional shape and stress characteristics of internal defects of a metal welding seam. According to the nondestructive testing method, with combination of an X-ray computed tomography scanning technology and a finite element analysis technology, the three-dimensional shape and the stress characteristics of the internal hole defects of the dissimilar metal welding seam can be tested under the condition without destroying a test piece. The method can also be used for obtaining space distribution, the hole size, the porosity, a pore-size distribution evolution law and the hole topological performance such as information including connectivity and tortuous degree of the internal hole defects of the dissimilar metal welding seam. The nondestructive testing method comprises the following steps: preparing a sample, scanning the test sample piece to acquire a scanned picture, recording a corresponding metal welding parameter, processing acquired scanned picture information, rebuilding a three-dimensional model, and testing and verifying the three-dimensional model by carrying out model mechanical analysis.

The invention discloses an X-ray computerized tomography system, which is used for partially scanning an object to be detected. The system comprises a middle angle computing module, a rebuilding angle computing module and a scanner, wherein the middle angle computing module is used for computing a middle angle according to the size of the vision field cross section and the central coordinate of the object to be detected, and transmitting the middle angle to the rebuilding angle computing module; the rebuilding angle computing module is used for adding the middle angle to 180 degrees to obtain a rebuilding angle, and transmitting the rebuilding angle to the scanner; and the scanner is used for scanning a part of the object to be detected according to the rebuilding angle. The invention further discloses an X-ray computerized tomography method. Due to the adoption of the system and the method, the scanning time can be shortened, the time resolution can be increased, and the radiation dosage received by a patient can be reduced.

The invention belongs to the technical field of X ray computerized tomography (CT), and particularly relates to a wide visual field cone-beam X ray oblique scanning three-dimension digital imaging method based on an algebraic reconstruction algorithm. The method comprises the following steps: acquiring two-dimension projection data of a scanned component in detector biasing wide visual field cone-beam X ray oblique scanning way; and rebuilding an image by the algebraic reconstruction algorithm to obtain a three-dimension computerized tomography image in a scanning area. Compared with the widevisual field cone-beam X ray oblique scanning three-dimension digital imaging method based on a filter back projection algorithm, the method can effectively inhibit structure aliasing between layers and obviously improve the quality of the rebuilt picture in the condition that the system hardware, the scanning view field and the scanning speed are not changed.

The invention relates to a method for determining and analyzing a pore structure of saline-alkali soil, and belongs to the field of soil structure determination and analysis method. The invention aimsto provide the method for determining the pore structure of the saline-alkali soil with no disturbance and no destruction and an application thereof, so as to solve the problem in the prior art thatsoil with macropore property cannot be measured under a condition without destroying soil. The method for determining and analyzing the pore structure of the saline-alkali soil includes the followingsteps: sample collection: selecting to-be-measured soil, knocking a sampling container into soil in a vertical direction, and collecting an original soil column; sample scanning: putting the originalsoil column into an X-ray computerized tomography scanner, and scanning; and image processing: inputting the scanned image of the cross section of the original soil column into a computer, and carrying out batch treatment on the image by the computer, to obtain the number and area of pores of the cross section of the original soil column. The spatial distribution of the macropore structure in thesoil column is more rapid, accurate and intuitive to determine and calculate.

Systems and methods for integrating a three-dimensional X-ray computed tomography system with an independent sound wave system to determine mechanical properties of tissue using signals from the sound wave system. Methods are disclosed that generate a numerical simulation and take the transmitted wave signals as the optimization objective to estimate modulus distribution of the tissue. Further, the mechanical properties of the tissue are reconstructed based on an inverse algorithm.

In a method and an evaluation device for determining the position of a structure located in an object to be investigated by means of X-ray computer tomography, a cutting data record, which images the object in a cutting plane, is determined from a volume data record of the object. The cutting data record is binarized to form a binary data record, in which the structure voxels imaging the structure and the surface voxels imaging an object surface are determined. To determine the position, a distance data record is produced in such a way that a distance value, which characterizes the smallest distance of the respective distance voxel from the surface voxels, is assigned to each distance voxel of the distance data record. The distance voxels corresponding to the structure voxels are then determined and the associated distance values evaluated.