146results about "Radiation diagnostics testing/calibration" patented technology

The invention relates to a system and method for determining a health metric for an imaging system. The method is a computer-implemented method comprising: receiving (110) sensor data acquired during a diagnostic sequence comprising a plurality of diagnostic intervals, where a different set of subsystems of the imaging system (60) is active during each of the diagnostic intervals, and where the sensor data is acquired during the diagnostic sequence; a respective subset of sensor data is acquired during each of the diagnostic intervals. The method further comprises analyzing (120) the subsets of sensor data, and determining a health metric based on a combination of the subsets of sensor data acquired during different diagnostic intervals by performing mathematical operations between at least two subsets of sensor data acquired during mutually different diagnostic intervals. The method may include determining (130) a state of health of the imaging system based on the health metric.

The application provides a three-dimensionally heterogeneous PET system comprising at least two heterogeneous detector modules, each comprising at least two kinds of crystal strips closely arranged to form different detection performances levels for different kinds of crystal strips and same detection performances levels for same kind of crystal strips. Parameters of detection performances of crystal strips comprise energy resolution, density, size and light output, wherein different detection performances levels for crystal strips comprise one or more of parameters of detection performances of crystal strips being in different levels. Compared with a high spatial resolution PET system, the application effectively reduces manufacturing costs of a PET system without significantly reducing spatial resolution thereof. Compared with an ordinary spatial resolution PET system, it improves spatial resolution of a PET system by slightly increasing its cost, and can also provide imaging field of view with high spatial resolution in radial direction.

An X-ray diagnostic apparatus according to the embodiment includes an X-ray tube, an X-ray diaphragm assembly, an X-ray detector, and processing circuitry. The X-ray diaphragm assembly includes an X-ray diaphragm defining an irradiation field of X-rays emitted from the X-ray tube and has a characteristic object. The X-ray detector is configured to detect the X-rays emitted from the X-ray tube and passed through a subject. The processing circuitry is configured to calculate information indicating a relative positional relationship between the X-ray tube and the X-ray detector based on an image of the characteristic object depicted in an X-ray image being based on transmission data acquired by the X-ray detector.

The invention relates to a device for conducting an examination of an object using X-ray radiation, - wherein the device comprises a functional element arranged in the radiation area so as to be movable in one direction of movement, which has an electrically and / or magnetically conductive area, and a position sensor, - wherein the position sensor has an electrical coil arrangement for detecting the conductive area and for providing a total voltage depending on the detection of the conductive area, - wherein the coil arrangement comprises an excitation coil for providing an alternating magnetic field and two detection coils connected in series for detecting at least a part of the alternating magnetic field, wherein the detection coils and the excitation coil are arranged such that the sum voltage across the two detection coils depends on a position of the functional element relative to the position sensor, - wherein the device is configured to determine a position signal relating to the position of the functional element relative to the position sensor, depending on the total voltage.

The invention discloses a non-radiative C-arm geometric calibration method and system, and aims to realize non-radiative automatic calibration of geometric parameters of a C-arm system by introducing an external sensor. According to the method, on the premise that an X-ray source is not started, space pose estimation and geometric relation solving of equipment can be completed, and therefore the safe, rapid and repeatable calibration process is achieved. Meanwhile, real-time updating and dynamic compensation of calibration parameters can be achieved, the method is particularly suitable for scenes such as intra-operative navigation, intelligent robot guiding and C-arm pose tracking, and the clinical usability and precision stability of the system are remarkably improved.

An operating method of an apparatus according to an embodiment of the present disclosure may comprise the steps of: measuring a reference irradiation field for an effective reception surface; measuring a first irradiation field as X-rays are irradiated, after the positions of two collimators are moved toward the center of the reference irradiation field by a first distance from a reference position of the reference irradiation field; measuring a second irradiation field as the X-rays are irradiated, after the positions of the two collimators are moved toward the center of the reference irradiation field by a second distance from the reference position of the reference irradiation field, the second distance being greater than the first distance; and determining whether the difference between the second distance and the first distance matches the difference between the first irradiation field and the second irradiation field.

The invention relates to a device for performing an examination of an object by means of X-ray radiation, wherein the device has a functional element which is movably arranged in a radiation region in a movement direction and a position sensor, the functional element having an electrically and / or magnetically conductive region, wherein the position sensor is an electric coil assembly for detecting the conductive region and for providing an overall voltage depending on the detection of the conductive region, wherein the coil assembly has an excitation coil for providing an alternating magnetic field and two series-connected detection coils for detecting at least a portion of the alternating magnetic field, wherein the detection coils and the excitation coil are arranged such that the overall voltage over the two detection coils is dependent on the position of the functional element relative to the position sensor, wherein the device is configured to derive a position signal dependent on the position of the functional element relative to the position sensor from the overall voltage.

Methods, systems, and computer readable media are provided for reduced dose angiography using machine learning (e.g., deep learning) using consistency metrics, the consistency metric indicates a degree of similarity between an estimated segmentation of the angiographic image generated by the machine learning model and a reference angiographic image provided as input to the segmentation of the machine learning model. Briefly, the techniques described herein may use a neural network trained to preserve / maintain the quality of angiographic images by employing consistency metrics while reducing the dose of angiography of potentially harmful chemical contrast agents and / or X-ray radiation.

The application relates to a subject vertical positioning method, a subject vertical positioning device and a CT system. The method comprises the following steps: acquiring the position of an examination bed after the subject is positioned; determining a measurement range corresponding to the organ of the subject on the examination bed, the measurement range comprising a starting point and an ending point in the horizontal direction; during the movement of the examination bed towards a scanning frame, starting the measurement of the distance from the subject by a sensor attached to the scanning frame when the starting point reaches a measurement position of the sensor, and stopping the measurement when the ending point reaches the measurement position, and acquiring the height of the examination bed while the sensor is measuring; calculating the organ center height based on the measurement result of the sensor, the height of the sensor and the height of the examination bed, the height representing the average height of the organ in the vertical direction; and adjusting the height of the examination bed based on the organ center height, so that the adjusted organ center height is equal to the isocenter height of the scanning frame, so as to realize the effects of minimizing the radiation dose of the subject and improving the CT imaging quality.

The invention discloses a device and a method for detecting obstacles of a movable examination bed and medical imaging equipment. The device comprises a first camera shooting unit which shoots a first reference image when the bed board is located at the first position and a first image before the bed board advances; a second image capturing unit that captures a second reference image when the bed plate is located at the second position and a second image before travel; the judging unit is used for pre-judging whether the bed jamming or collision possibility exists in the travel of the bed board or not according to the advancing direction and travel of the bed board, the position of the bed board when the first image or the second image is shot, the first reference image, the first image, the second reference image and the second image; and the prompting unit is used for giving out a prompt when the judgment unit judges that the bed jamming or collision possibility exists.

The application provides a method and device for monitoring the dose of an X-ray machine, the method comprising: obtaining a functional relationship between the dose rate of the X-ray machine at a preset detection position and the exposure parameter of the X-ray machine when the X-ray machine operates at a preset frame rate; calculating the dose rate at a target detection position when the X-ray machine operates at a target frame rate and a target exposure parameter according to the functional relationship, the distance between the preset detection position and the target detection position relative to the focal point of the X-ray machine tube; calculating the cumulative dose of the X-ray machine at the target detection position according to the dose rate and the exposure time of the X-ray machine; and calculating the cumulative dose-area product of the X-ray machine according to the cumulative dose and the field area of the X-ray machine at the target detection position. The method and device for monitoring the dose of the X-ray machine can realize accurate measurement of the dose rate, cumulative dose and cumulative dose-area product of the X-ray machine through software, can balance low cost and high accuracy dose monitoring, and has a wide range of applications.

Systems and methods for analyzing images. The methods comprise using an imaging device to acquire a pre-shot image of a target anatomical area of an individual; analyzing the pre-shot image to assess image quality of one or more regions within the pre-shot image; and determining acquisition parameters for a full-dose image from the one or more measures of image quality. The methods also include acquiring, by the imaging device, a full-dose image using the acquisition parameters determined during analysis of the pre-shot image; and generating a final image from the full-dose image.

Embodiments of the present application provide a radiation detector assembly and a medical imaging device. The radiation detector assembly includes: a main circuit board, including a first region and a second region, wherein a detector component irradiated by rays is mounted in the first region, and a signal processing component that receives a signal generated by the detector component is mounted in the second region; a thermal control assembly, thermally coupled to the first region of the main circuit board; and a support assembly, supporting the main circuit board and thermally coupled to the second region of the main circuit board.

A method for detecting electromagnetic interference fields (EMI) during the operation of an X-ray detector (30) is described. First, a value (W) is determined which represents a variation of temporally successive detector signal values ​​(DSW) of a pixel (P) not exposed to X-rays. i ) or a group of pixels (P i The value of the X-ray detector (30) is displayed. The value is compared with a predetermined threshold (SW), and it is determined that a disturbance (ST) due to electromagnetic interference fields (STF) occurs if the determined value exceeds the predetermined threshold (SW). A disturbance detection device (20) is also described. Furthermore, an X-ray detector (30) is described.

A method for non-invasive quantitative measurement of cerebrovascular reserve (CVR) and cerebral blood flow (CBF) with 15O-water positron emission tomography (PET) in a human.

A radiographic imaging apparatus of the present disclosure includes an image outputter outputting a first radiographic image included in continuous radiographic images obtained by radiographic imaging of a subject, an image brightness information extractor obtaining brightness information from the first radiographic image, a first irradiation condition calculator determining a first irradiation condition based on the brightness information, an irradiation controller controlling a radiation dose based on the first irradiation condition, a second irradiation condition calculator determining a second irradiation condition based on a second radiographic image generated based on the first irradiation condition when an imaging site of the subject is fixed, and a dose reducer reducing or maintaining the radiation dose based on the second irradiation condition.

A functional component is arranged in the radiation region, configured to move in a movement direction and has at least one conductive region. A position sensor has an electrical coil arrangement configured to provide a summation voltage based on sensing of the at least one conductive region. The electrical coil arrangement includes an exciter coil configured to provide an alternating magnetic field, and two series-connected sense coils configured to sense at least part of the alternating magnetic field. The sense coils and the exciter coil are arranged such that the summation voltage across the sense coils depends on a position of the functional component relative to the position sensor. The apparatus is configured to determine a position signal based on the summation voltage, the position signal relating to the position of the functional component relative to the position sensor.

The application provides a kind of projection data pre-processing method, system, device and medium of CT scanning equipment, comprising: presetting multiple reference energy values, so that CT scanning equipment scans air multiple times to obtain multiple reference projection data corresponding to any reference energy value, obtain reference projection average value corresponding to any reference energy value, and form a reference list, the reference list includes the correspondence between multiple reference energy values and multiple reference projection average values;According to the actual energy value of the scanning site scanned by the CT scanning equipment, obtain the reference energy value corresponding to the actual energy value in the reference list, obtain the normalization base according to the reference projection average value corresponding to the reference energy value, and normalize the actual projection data of multiple angles scanned by the CT scanning equipment on the detection site. After adopting the scheme of the present application, it is not necessary to set a reference channel, the limitation on patient positioning is reduced, and no artifacts will be generated when the detector edge channel is blocked.

The invention relates to a scanning dose adaptive modulation method and device, electronic equipment and a readable medium, and the method comprises the steps: carrying out the normal position positioning phase scanning of a scanning object, and obtaining a positioning phase image of a scanning region; determining the equivalent diameter of each Z position in the Z direction according to the positioning phase image, and integrating each equivalent diameter into an equivalent diameter sequence; the number of scanning turns is obtained, the equivalent diameter sequence is averagely segmented according to the number of scanning turns, and the average equivalent diameter of each turn is obtained; substituting each average equivalent diameter into a gear-scanning dose modulation formula to obtain each dose control parameter, and generating a Z-direction dose modulation curve according to each dose control parameter; and correcting the Z-direction dose modulation curve along the XY plane based on the attenuation intensity of each projection angle so as to adaptively modulate the scanning dose of the scanning object through the corrected Z-direction dose modulation curve. The problem that the noise uniformity is poor in the Z-axis direction and at different scanning angles during CT dose modulation is solved.

The application discloses a CT scanning device, an alignment structure and an alignment method. The alignment structure comprises a centering holder arranged at the head end of a check bed and provided with a positioning clamping groove; a centering holder piece, the first end of which is fixed to the bottom of a scanning frame, the second end of which is a free end and matches the position of the positioning clamping groove, and the length direction of the centering holder piece is perpendicular to the vertical end surface of the scanning frame; the free end is clamped or separated with the positioning clamping groove to limit the relative position of the head end of the check bed and the scanning frame or release the position limitation; a laser lamp is arranged at the center of the top of the scanning frame to emit laser rays towards the check bed; the check bed is provided with a center mark line, and when the tail end of the check bed is swung to make the center mark line coincide with the laser rays, the check bed and the scanning frame are in the centered alignment state. The centering operation can be completed by the centering holder and the centering holder piece, the laser lamp of the scanning frame itself and the center mark line on the scanning bed, and the operation is simple, stable and reliable.

The application relates to a computer tomography tube current modulation method, device and electronic device, wherein the computer tomography tube current modulation method comprises the following steps: acquiring a first moving speed of a scanning bed and a first scanning tube current, wherein the first scanning tube current is a tube current applied by the scanning bed at the first moving speed; acquiring a second moving speed of the scanning bed; and generating a second scanning tube current according to the first moving speed, the second moving speed and the first scanning tube current, wherein the second scanning tube current is a tube current applied by the scanning bed at the second moving speed. Through the application, a computer device can modulate the first scanning tube current applied by the scanning bed at the first moving speed into the second scanning tube current applied at the second moving speed, thereby solving the problem that there is no scanning tube current modulation method for computer tomography under a variable speed state in the prior art.

Provided is a particle beam measuring device that contributes to making work simpler and more efficient during beam adjustment, beam evaluation, or similar, as well as to saving space in a storage area for attachments or similar. This particle beam measuring device (10) comprises: a transport mechanism (40) that is for transporting a patient to the inside of a rotary gantry and causing an affected part of the patient to coincide with an isocenter through which a particle beam (11) passes; a phantom (20) on which the particle beam (11) is made to be incident for the purpose of measurement; and an attachment (30) that attaches the phantom (20) as an end effector of the transport mechanism (40).

Various examples are provided related to reconstructing images such as, e.g., medical images from low-dose image scans. Adversarial learning such as, e.g., a Cyclic Simulation and Denoising (CSD) framework can be used to address challenges of complicated mixed noise in real low-dose scans. The CSD framework can include a simulator model that can extract low-dose noise and features (e.g., tissue features) from separate image spaces into a unified feature space and a denoiser model that can learn how to remove noise and restore features, simultaneously. Both the simulator model and the denoiser model can regularize each other in a cyclic manner to optimize network learning effectively. The CSD framework in combination with phantom scans can embrace the realistic low-dose noise and features into a unified learning environment to address the challenge of real low-dose image restoration.

To provide an X-ray imaging apparatus capable of suppressing an increase in an exposure dose resulting from re-capturing of an X-ray image due to an imaging failure by suppressing an occurrence of X-ray image capturing failures.SOLUTION: An X-ray imaging apparatus 100 includes: an X-ray irradiation unit 10 including an X-ray tube 11; a detector 30 for detecting an X-ray radiated from the X-ray irradiation unit; an image generation unit 50 for generating an X-ray image 63 based on the X-ray detected by the detector; an optical imaging unit 40 for capturing an image of a subject P and an optical image 64 in the direction of the detector from an X-ray irradiation unit side; a storage unit 60 for storing a learned model 62 for outputting discrimination information 65 for discriminating a state on an imaging range of a predetermined part of the subject or on a relative position for other parts for an input image 66 based on the optical image including the subject captured by the optical imaging unit; a control unit 70 for acquiring the discrimination information using the learned model; and a notification unit 80 for executing notification based on the discrimination information acquired by the control unit.SELECTED DRAWING: Figure 2

A computer-implemented method for a simulated computed tomography (CT) system is disclosed. The method includes receiving, via a user interface, a selected scan protocol and one or more characteristics of a patient or patient group. Using a CT simulator, determining parameter settings for scanning the patient or patient group are determined. The method further includes determining a projected image quality measure and dose using the CT simulator and generating a customized scan protocol for the patient or patient group based on the projected image quality measure and dose.

A system for combining a plurality of scans in a computed tomography (CT) imaging workflow, the system comprising: a protocol selection module configured to select two or more scan protocols for a patient; a scan combining module configured to combine scans associated with the selected scan protocol into a combined scan, where the scans are continuous or discontinuous based on the anatomical landmark; and a scan execution module configured to control the CT scanner to perform the combined scan on the patient.

The embodiment of the present application discloses a three-dimensional camera calibration method, device and storage medium in X-ray imaging. The method comprises the following steps: obtaining a three-dimensional image of a calibration board photographed by a three-dimensional camera, wherein the calibration board contains a positioning mark, and the calibration board has a predetermined distance from an X-ray bulb; determining a first three-dimensional coordinate of the positioning mark in a three-dimensional camera coordinate system based on the three-dimensional image; determining a second three-dimensional coordinate of the positioning mark in an X-ray bulb coordinate system based on the distance; and determining a conversion matrix suitable for calibrating the three-dimensional camera based on the first three-dimensional coordinate and the second three-dimensional coordinate. The embodiment of the present application can overcome the system error caused by the difference between coordinate systems.

The invention provides X-ray imaging equipment for real-time monitoring in the radiology department, and relates to the technical field of medical instruments, the X-ray imaging equipment comprises an imaging execution module, a data fusion acquisition module, a monitoring decision module and a feedback execution module, the imaging execution module generates original projection data; the data fusion acquisition module generates a comprehensive data set; the monitoring decision module receives and processes the comprehensive data set, judges a risk level through a risk assessment model, and generates a corresponding decision instruction; and the feedback execution module receives the decision instruction, performs real-time regulation and control on the original projection data according to the decision instruction, and outputs visual monitoring and early warning information to the operation interface at the same time. The problems that in the prior art, due to the split relation between the imaging function and the monitoring function, intelligent linkage monitoring cannot be carried out based on imaging operation, the physiological state of a subject is abnormal, and equipment operation risk identification lags behind are solved.

An artificial intelligence (AI) lead marker detection system (100) is employed either as a component of the X-ray imaging system (10) or separately from the X-ray imaging system (10) to scan post-exposure X-ray images (106) to detect and insert various lead markers (104,108"), to digitize information provided by the type and location of the lead marker (104), and to employ the marker information in different X-ray system workflow automations. The marker information obtained by the AI lead marker detection system (100) can also provide useful data for use in downstream clinical and quality applications apart from the X-ray system (10), such as either AI or non-AI analytical applications.