36 results about "X Ray Computerized Tomography" patented technology

A method, system, and storage medium for computer aided processing of an image set includes employing a data source, the data source including an image set acquired from X-ray projection imaging, x-ray computed tomography, or x-ray tomosynthesis, defining a region of interest within one or more images from the image set, extracting feature measures from the region of interest, and reporting at least one of the feature measures on the region of interest. The method may be employed for identifying bone fractures, disease, obstruction, or any other medical condition.

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.

In an X-ray computerized tomography scanner, a correction phantom embedding an X-ray absorbing object is put on or around a non-vertical rotary axis between an X-ray source and a two-dimensional X-ray detector, and two dimensional imaging data of the phantom is acquired. Then a locus of the X-ray absorbing material is determined in the two-dimensional imaging data, and based on the locus an ideal locus is obtained in the direction of the rotary axis. Next, a difference between the calculated position of the ideal locus and a measured position is determined in the direction of the rotary axis. The difference is used to correct deviation in the direction of the rotary axis.

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 an automatically radiation-proof FMT-and-CT dual-mode imaging system. The automatically radiation-proof FMT-and-CT dual-mode imaging system comprises a signal collecting module, a controller module, a data transmission module, a power module and an automatically radiation-proof module, wherein the signal collecting module is used for collecting fluorescence excitation imaging data and X-ray computerized tomography data of an imaging sample, the controller module is used for controlling operation, parameter setting, data processing and data storage of other modules, the data transmission module is used for transmitting internal data of the system, the power module is used for providing electricity for the whole system, and the automatically radiation-proof module is used for protecting a CCD camera and reducing damage caused by X-rays to the CCD camera. The automatically radiation-proof FMT-and-CT dual-mode imaging system can achieve dual-mode rapid imaging of FMT and CT, and due to the fact that the automatically radiation-proof module is designed, when an X-ray power source is turned on, the CCD camera is effectively protected, and damage to an internal sensitization chip can be reduced.

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 belongs to the field of X ray computerized tomography (CT) technology, in particular to an X ray source focus drifting CT reconstruction method. The method is based on the filtered backprojection reconstruction theory, deduces weighting, filtering and backprojection calculation formulas of ST projection data according to the CT scanning geometric construction during the focus drifting of an X ray source, introduces a distance parameter of the focus drifting of the X ray source during reconstruction, thereby forming a novel reconstruction algorithm. Since the CT scanning geometric construction corresponding to the traditional reconstruction algorithm is different from the structure formed during the focus drifting of the X ray source, the traditional reconstruction algorithm can not be used to reconstruct the image of a two-dimension CT projection the X ray source focus of which drifts. The invention solves the problem of X ray CT reconstruction under the condition of thefocus drifting of the X ray source and has a simple and highly-efficient reconstruction process.