Abstract: A method and apparatus for correcting a focus of a CT device are provided. The method includes: calculating a total focus shift according to scanning data; and correcting, when the CT device is running, a deflection of an electron beam emitted from a ray source of the CT device, based on the total focus shift. The device includes: a shift calculation module, configured to calculate a total focus shift according to scanning data; and a shift correction module, configured to correct, when the CT device is running, a deflection of an electron beam emitted from a ray source of the CT device, based on the total focus shift.

Abstract: A method for sharing medical image data based on a cloud platform, a cloud platform and a system are disclosed. The cloud platform is connected to at least one medical imaging device. The method includes: receiving a medical image and/or scan data transmitted from the at least one medical imaging device; and storing, on the cloud platform, the medical image and/or scan data from the at least one medical imaging device.

Abstract: A posture detection method and system are provided. The posture detection method includes: obtaining skeleton data of a target person; analyzing the skeleton data to obtain actual posture information of the target person; and recording the actual posture information of the target person. The accuracy of determining the posture information by obtaining the skeleton data of a body is quite high. Besides, the actual posture information is recorded automatically, so that a doctor does not need to record the posture information manually. Therefore, scanning missing or wrong scanning direction caused by inconformity between the real posture of the patient and the recorded posture information may be avoided, which ensures the reliability of medical diagnosis.

Abstract: A patient table and a control device of a pallet of the patient table are provided according to the present application to facilitate achieving the switching between manual operation and automatic operation in controlling the pallet, and to improve the operation convenience. The control device includes a through-beam photoelectric switch, a shutter and a trigger connected to the shutter, the trigger is arranged on a push-pull portion of the pallet to allow the shutter to be driven to move when a hand acts on the push-pull portion, to block a light beam of the through-beam photoelectric switch. The through-beam photoelectric switch is in signal connection with the control board of the patient table and is configured to send a signal for releasing the pallet to the control board of the patient table once the light beam of the through-beam photoelectric switch is blocked.

Abstract: A method for optimizing CT scanning parameter is disclosed. A target group may be generated from a plurality of reference information samples. Each of the reference information samples may include subject information, information indicating a scanning protocol, one or more scanning parameter values and information indicating reconstructed image quality; the target group can consist of one or more reference information samples with the same subject information and the same scanning protocol. A scanning parameter optimization may be performed according to reconstructed image qualities and scanning parameter values of reference information samples in the target group, so as to acquire a target scanning parameter value of the target group. And according to the target scanning parameter value, a reference X-ray irradiation dose corresponding to the scanning protocol and the subject information of the target group may be determined.

Abstract: A method and apparatus of current modulation in a computed tomography imaging system are provided. The method may include: selecting a plurality of sample points from an expected current modulation curve as approach points; establishing an actual current modulation curve, wherein an actual current value of the actual current modulation curve at an approach point approximates an expected current value of an expected current modulation curve, and a variation rate of the actual current is within an allowed range of the computed tomography imaging system; and modulating a current in an X-ray tube of the computed tomography imaging system according to the actual current modulation curve. According to the disclosure, an image valuable to the diagnosis can be obtained with the smallest radiation dose.

Abstract: A method and apparatus of image position compensation are provided. The method may include: measuring an actual height at Z position and a corresponding drop offset of a scanning table; adjusting, according to the drop offset of the scanning table, a vertical coordinate of an image center in the process of post-reconstruction, so as to obtain an adjusted image; and performing an interpolation process on coordinate information and pixel values of a row in the adjusted image, to obtain pixel values of a row in a target image. The target image is an image which has been processed by position compensation. According to the present disclosure, an image generated by a CT apparatus can be compensated to obtain a correct tomographic image and provide accurate image information for medical diagnosis.

Abstract: A scanning method and device are provided. The method includes: determining values for a first scanning dosage and a second scanning dosage used in a scanning process based on a trigger condition which varies regularly and attenuation fluctuations of an object to be scanned, wherein the first scanning dosage is higher than the second scanning dosage, and at least one of the first scanning dosage and the second scanning dosage has an inconstant value; and scanning a target position with the determined values. In the present disclosure, a scanning dosage may be reduced and different image noises may be kept consistent.

Abstract: A CT pilot image acquisition method and a CT device are provided. The method may include: performing a helical scan on a predetermined area to be scanned, so as to obtain scanning data; reconstructing a tomographic image based on the scanning data; performing, at a predetermined positioning angle, a parallel beam projection on the tomographic image by using a virtual parallel X-ray beam, so as to obtain projection data; and re-binning a CT pilot image at the predetermined positioning angle based on the projection data. Parallel beam projection is adopted to process the tomographic image, to obtain a pilot image without geometric distortions. The obtained pilot image can reflect an anatomical structure of human body accurately.

Abstract: Disclosed are a method and apparatus for improving image reconstruction speed, to improve the image reconstruction speed by acquiring optimal thread configurations of execution units under different scanning conditions.

Abstract: A method and apparatus of image compensation are provided. The method may include: calculating an overlapping position between two adjacent scannings; obtaining two images at the overlapping position of the two adjacent scannings, and calculating mutual information of the two images by using a three dimensional non-rigid registration method; and acquiring a corresponding transformational matrix when the mutual information reaches a threshold, and compensating one of the two scans which needs to be compensated by using the transformational matrix. Images at the overlapping position of two neighboring scannings can be used to find a motion law at an identical z position of the two adjacent scannings and to obtain a corresponding match factor. Thus inconsistence of images caused by a patient's movement can be compensated.

Abstract: A method and a system for data compression are provided. The method may include: obtaining scanning data to be compressed; compressing the scanning data using a first compression method and a second compression method to obtain a first compressed data and a second compressed data respectively, where a compression ratio of the first compressed data is lower than a compression ratio of the second compressed data; and determining whether the compression ratio of the first compressed data meets a predetermined compression ratio requirement, if yes, determining the first compressed data as a compression result data corresponding to the scanning data, if no, determining the second compressed data as a compression result data corresponding to the scanning data. Scanning data compressed by the method or the system can meet target compression requirements.

Abstract: A method for collecting multi-energy CT data is provided. A method of reconstruction from multi-energy CT scan is further provided, in which data collection is performed on the first-class object at voltage values of m sampling points of the first-class voltage varied periodically, to obtain n sets of multi-energy first-class scan data {yi}; and a data collection is performed on a double-cylinder correction phantom at the voltage values of m sampling points to obtain combination coefficients, and thus obtaining corresponding combination coefficients Cifirstand Cisecondcorresponding to the case that the first-class scan data is collected in the ith projection angle at the first-class voltage; and the image vectors Xfirst and Xsecond are obtained by calculating a minimum value of the difference between the first-class scan data {yi} and the combination projection data CifirstPi*Xfirst+CisecondPi*Xsecond.

Abstract: A system and a method for implementing warm-up scanning in a CT device are provided. The method includes: closing a slot of a beam limiter before a warm-up scanning process is initiated; implementing the warm-up scanning process to a CT radiation source; and opening the slot of the beam limiter after the warm-up scanning process is finished. The target object may not need to move during the warm-up scanning process. Therefore, a second time scout image scanning is no longer necessary and extra ionization radiation may be avoided.

Abstract: Image reconstruction method and device for tilted helical scan are provided. The method includes: acquiring data generated by the tilted helical scan; calculating a ray channel parameter and a slice number corresponding to each pixel position based on a geometric relationship that a ray of the tilted helical scan emitting from a ray source to a detector intersects with a pixel; and performing image reconstruction by using a three-dimensional helical back-projection method based on the acquired data, and the ray channel parameter and the slice number corresponding to each pixel position. With the method and device, there is no need to correct the raw data, which ensures the accuracy of the data, and the artifact is avoided, which ensures the accuracy of the reconstructed image.

Abstract: A scanning system and an image display method are provided, the method including: implementing a scanning process to obtain scanning data; converting the scanning data into image data; implementing an identification process and a segmentation process to the image data to obtain position and direction information of an interventional device; and calculating a first set of imaging parameters corresponding to a first image display mode based on the obtained position and direction information of the interventional device, and implementing real-time image display based on the first set of imaging parameters. Position and direction of interventional devices may be determined accurately. Further, multiple display modes are available, which may provide an accurate and full range image display.

Abstract: A detector module is provided, where a side of a signal adapter circuit board opposite to an X-ray source has an analog signal output terminal, at least one A/D chip is installed on an A/D conversion circuit board, and the signal adapter circuit board and the A/D conversion circuit board are connected through non-removable flexible connection with a data line. The data line is connected with the analog signal output terminal and an input terminal of the at least one A/D chip, and is adapted to transmit an analog signal. Therefore, the number of A/D conversion circuit boards in a direction of a channel of a scan chamber is increased, and a signal adapter circuit board along a direction of the channel of the scan chamber may be set to have a maximum width when detector modules are arranged closely, which is beneficial for reducing wiring density of signal wires.

Abstract: An X-ray collimator used in a CT system is provided, including: a first guide rail and a second guide rail disposed in parallel with each other; and a first gate assembling unit and a second gate assembling unit disposed in parallel with each other. The first gate assembling unit has one end provided with a driving mechanism and fixedly connected with the first guide rail, and another end connected with the second guide rail in a slidable connection. The second gate assembling unit has one end provided with a driving mechanism and fixedly connected with the second guide rail, and another end connected with the first guide rail in a slidable connection. And blocks for supporting and position limiting are provided on two ends of the first guide rail and two ends of the second guide rail. Sheltering effect on X-rays may be improved.

Abstract: A scanning system and an image display method are provided, the method including: implementing a scanning process to obtain scanning data; converting the scanning data into image data; implementing an identification process and a segmentation process to the image data to obtain position and direction information of an interventional device; and calculating a first set of imaging parameters corresponding to a first image display mode based on the obtained position and direction information of the interventional device, and implementing real-time image display based on the first set of imaging parameters. Position and direction of interventional devices may be determined accurately. Further, multiple display modes are available, which may provide an accurate and full range image display.

Abstract: A method and a device for tracking a contrast medium by scanning are provided. The method includes: obtaining a relationship between a contrast medium concentration and time according to concentration values of the contrast medium obtained by previous scannings; predicting a time interval from a current time point to a time point when a target concentration value reaches according to the relationship between the contrast medium concentration and time; and starting a routine examination at the end of the time interval. In the present disclosure, a routine examination may be performed in time.