35 results about "Ct measurements" patented technology

In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.

An embodiment in accordance with the present invention provides a device and method for a quantitatively calibrated computed tomography scanner. The device includes a gantry configured for receiving a patient or part of a patient. The gantry includes an X-ray source and a detector positioned opposite said X-ray source, such that said detector receives the X-rays emitted from the X-ray source. Calibration phantoms are integrated with the gantry and / or a device within the scanner so as to allow for calibration in quantitative CT measurements of Hounsfield units and / or bone mineral density.

In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.

An embodiment in accordance with the present invention provides a device and method for a quantitatively calibrated computed tomography scanner. The device includes a gantry configured for receiving a patient or part of a patient. The gantry includes an X-ray source and a detector positioned opposite said X-ray source, such that said detector receives the X-rays emitted from the X-ray source. Calibration phantoms are integrated with the gantry and / or a device within the scanner so as to allow for calibration in quantitative CT measurements of Hounsfield units and / or bone mineral density.

An apparatus for inspecting lenses includes an inspection system including an open cuvette, a communicatively coupled CT measurement device, and a user interface communicatively coupled to the inspection system. According to one embodiment, the lens inspection system provides a single instrument for inspecting the quality of a lens, thereby minimizing the transference of the lens from one inspection component to another.

The invention relates to the field of medicine, and discloses an intramedullary fixation guider. In the invention, data at both a nail insertion point A and a nail withdrawal point B can be acquired according to the measurement result of preoperative three-dimensional reconstruction CT (Computed Tomography), wherein the nail insertion point A can be directly located according to the mark on the body surface due to the shallow and easily-exposed position of the nail insertion point A. Then, the nail withdrawal point B is located by using the locator according to the CT measurement data, and a guide bar is utilized to connect the nail insertion point A and the nail withdrawal point B. The three-dimensional CT scanned data is used, and the nail withdrawal point is determined by the locator so as to determine the nail withdrawal direction of the guider, thereby accurately controlling the injection and withdrawal routes of the nail. Since the injection and withdrawal routes of the nail are ensured by a precision instrument instead of the experience of the operator, the intramedullary fixation guider can maximally prevent the nail in the penetration process from mistakenly entering the hip joint or mistakenly penetrating the cortex of bone to damage important anatomical structures, such as nerves, blood vessels and the like.

A computed tomography device (CT device) includes a user interface, via which the standard settings characterizing the CT measurement can be performed. At the same time, in a method and a computed tomography device for carrying out this method, filtering behavior of the filter electronics is adapted to the configuration of the standard settings by the system computer.

The present invention provides a method for correcting CT radiation hardening in a multiphase flow system, comprising the following steps: 1) using fluid mechanics software to generate a simulated flow field of the multiphase flow system; 2) selecting a two-dimensional section of the simulated flow field, Obtain the flow field data of this two-dimensional cross-section; 3) select the material and thickness of different filter discs, simulate the process that CT scans the described two-dimensional cross-section, and obtain the simulated two-dimensional cross-section corresponding to different filter disc materials and thicknesses respectively. Reconstructing the image; 4) determining the material and thickness of the filter required for actual CT measurement according to the degree of approximation between each simulated two-dimensional reconstructed image and the simulated flow field data. The advantage of the present invention is that, by combining computational fluid dynamics with CT simulation, the shortcoming of being unable to produce an accurate and repeatable flow field in physical experiments can be overcome; and the present invention can determine the hardening correction parameters of the CT system through computer simulation, thereby Save a lot of manpower, material and financial resources.

Renal extraction fraction (EF) is determined through use of computed tomography (CT) measurements of arterial blood before and after injection of a radiographic contrast agent into the blood and CT measurements of renal vein blood after injection of the radiographic contrast agent.

The invention relates to a method for measuring area changes of CO2-saline water interfaces in a porous medium by using a CT. The method comprises the steps of firstly preparing saline water containing potassium iodide to strengthen the image contrast of CO2-saline water; continuously scanning by using the CT to obtain unsteady-state porous medium images under the CO2-saturated condition and different injection conditions; removing a noisy point by using a filter and carrying out threshold processing to generate binary images only containing 0 and 1 of saturated CO2 and under different injection conditions; carrying out subtraction on two image stacks to obtain distribution areas of the saline water in the binary images; extracting the edges of the distribution areas of the CO2 and the saline water and determining a union set to generate binary image slice stacks of the CO2-saline water interfaces; obtaining the area changes of the CO2-saline water interface in the porous medium under different injection conditions through determining and measuring the area of disconnected CO2-saline water interfaces; and calculating the saturability of the saline water in each image slice stack and obtaining area change characteristic parameters of the CO2-saline water interfaces under different injection conditions through induction.

This application discloses a secondary current amplification coil of a current transformer, which is used in the CT vector measurement of the secondary side of the current transformer in the power system power generation process. The coil body, and the two ends of the wire are free ends with a length of N. When the secondary side CT vector measurement is performed under the condition of no-load operation of the transmission line, the current measured by the clamp phase meter through the coil body is M times the capacitive current generated to the ground under no-load conditions, and the phase The current measured by the meter meets the accuracy requirements, and the phase angle of the measured voltage remains unchanged. It can be seen that the secondary current amplification coil of the current transformer disclosed in this application can also perform CT on the secondary side under the condition of no-load operation of the transmission line. Vector measurement does not require switching operations, thereby improving measurement efficiency.

The invention discloses an image restoration-based industrial CT geometric dimension measurement method, which overcomes the problem that some industrial CT geometric dimension measurement methods still need to be improved in the prior art. The specific steps of the invention are as follows: (1) acquisition of projection data; (2) reconstruction of CT image after beam hardening correction; (3) calculation of two-dimensional PSF; (4) image restoration; (5) geometric dimension measurement. Compared with the prior art, the image restoration-based industrial CT geometric dimension measurement method of the present invention has the following advantages: the fuzzy degradation effect of the CT image restored by the inventive method can be effectively suppressed, and a better geometric dimension can be obtained measurement accuracy.

The invention provides an X-ray CT (Computed Tomography) measurement system for gas-water relative permeability, and belongs to the technical field of CO2 capture and storage. The X-ray CT measurement system comprises a sand filling pipe, a saline water / CO2 injection system, an X-ray CT imaging system, a computer data acquisition system, a liquid conveying system, a temperature control system, a vacuum pipe and a back pressure valve. A main body of the sand filling pipe is in an aluminum alloy structure so as to enhance the penetration of X-ray; upper and lower flange discs of a core barrel are in stainless steel structures and can be detached freely. The upper and lower flange discs are provided with dense stainless steel wire meshes so as to prevent sand from flowing into an experiment device. Sealing rings are arranged at the butt-joint parts of the upper and lower flange discs and the main body of the sand filling pipe and are used for sealing the sand filling pipe and the experiment device. According to the X-ray CT measurement system, the saturation level and the relative permeability of each phase of two-phase flows of CO2 and saline water in a porous medium can be measured efficiently and reliably; the interference problems of various influence factors in a measurement process of the saturation level and the relative permeability of the two phases including the CO2 and the saline water are solved.

The invention discloses an visceral organ tissue high-identification imaging method and device, a storage medium and computer equipment. The method comprises the steps: obtaining CT measurement data of a single kVp; performing data correction processing on the CT measurement data to obtain corrected CT measurement data; inputting the corrected CT measurement data into a converged first neural network model to generate and output a CT bone image or a soft tissue image. In the method disclosed in the embodiment of the invention, a high-quality CT bone image or soft tissue image can be obtained only by inputting conventional single-kVp CT measurement data, the efficiency is high, and the radiation dose of a patient is reduced.

A computed tomography device (CT device) includes a user interface, via which the standard settings characterizing the CT measurement can be performed. At the same time, in a method and a computed tomography device for carrying out this method, filtering behavior of the filter electronics is adapted to the configuration of the standard settings by the system computer.

The invention provides a method for calibrating CT measurement data by using profile measurement data, and belongs to the technical field of industrial CT nondestructive testing. In allusion to the problems that industrial CT measurement errors are complex in source and difficult in traceability, according to the actual situation that appearance measurement instruments are multiple in variety and easy to obtain, by means of the characteristics of high precision and high reliability of appearance measurement data, the measurement deviation of CT is obtained by measuring the geometric dimensions of the same part of parts, and then the CT measurement precision is improved by adopting a mode of firstly measuring and then calibrating or firstly calibrating and then measuring. The method does not need to develop special standard parts, is not influenced by factors such as part materials, structures and sizes, is wide in applicability, and can effectively improve the precision and reliability of CT measurement results.