Abstract: Methods, apparatuses, and systems for surview scans are provided. In one aspect, a method includes: collecting a static image for a subject on a scan bed when it is stationary; determining a scan beginning position and a reference position in the static image; obtaining a first distance between the scan beginning position and the reference position; during a movement of the scan bed, obtaining a video image of the subject in real time; identifying a corresponding reference position in the video image; marking, according to the corresponding reference position and the first distance, a corresponding scan beginning position in the video image; detecting a second distance between the corresponding scan beginning position and a positioning line in the video image; and in response to detecting that the second distance is equal to or less than a predetermined first threshold, starting the surview scan to obtain a surview image.

Abstract: Methods, systems, devices and apparatus for vascular calcification detection are provided.

Abstract: Multi-sequence scanning methods and apparatuses, devices and CT systems are described. A multi-sequence scanning method may include: in response to a parameter configuration command, configuring scan sequence parameters for a plurality of scan sequences in a scan protocol to obtain a target scan protocol, where the scan sequence parameters include a scan start time and a scan duration of each of the scan sequences, and a scan switching duration between the scan sequences, where a total scan duration of the scan sequences in the target scan protocol is configured to be less than or equal to a preset total scan duration, and where the scan switching duration between the scan sequences is configured in a shortest duration mode; and in response to receiving a scan command, controlling the CT system to scan a scanned object according to the scan sequence parameters configured in the target scan protocol.

Abstract: Methods, apparatuses and systems for surview scans are provided. In one aspect, a method includes: collecting an image for a subject on a scan bed of a computed tomography system when the scan bed is stationary; determining a scan beginning position for a surview scan in the image, where graduation patterns are marked on the scan bed, and a relative position between the graduation patterns and the scan bed remains unchanged; obtaining a first distance between the scan beginning position and a surview collection plane perpendicular to the scanning bed according to the graduation patterns in the image; controlling the scan bed to move toward the surview collection plane; and in response to determining that a scan bed moving distance reaches the first distance, starting the surview scan to obtain a surview image.

Abstract: Methods, systems, and apparatus for image processing are provided. In one aspect, a method includes: acquiring an image to be processed that involves a target object, extracting image noise information and contour information of the target object from the image to be processed, generating a noise distribution image based on the image noise information and the contour information of the target object, and obtaining a target image by performing noise reduction on the image to be processed with the noise distribution image.

Abstract: Methods, devices, and systems for data monitoring are provided. In one aspect, a method of data monitoring, applicable to a magnetic resonance system, includes: obtaining radio frequency (RF) waveform information which is to be sent to an RF transmitting coil of the magnetic resonance system; extracting target waveform information within a current sliding window from the RF waveform information, with a current time point being located within the current sliding window; obtaining, based on the target waveform information, target magnetic flux densities corresponding to the current sliding window; and determining a current real-time specific absorption rate (SAR) based on the target magnetic flux densities.

Abstract: Methods, devices, electronic devices, apparatus, and systems for image reconstruction are provided. In one aspect, a method includes: obtaining first Computed Tomography (CT) data collected by a CT device performing a first contrast medium tracking scan on a target object based on a first reciprocating scanning sequence, obtaining second CT data by the CT device performing a second contrast medium tracking scan on the target object based on a second reciprocating scanning sequence in response to determining that a CT value in the first CT data exceeds a CT value threshold, and reconstructing CT images of the target object by using the first CT data and the second CT data respectively.

Abstract: High voltage assemblies and detectors are provided. In one aspect, a high voltage assembly includes a high voltage base board and a plurality of sub-detectors. Each sub-detector includes a crystal substrate, a crystal, a high voltage transfer board, and a high voltage cathode board. One of the high voltage transfer board and the high voltage base board includes first and second connection members, and the other one includes first and second contact members. The first connection member is configured to shift relative to the first contact member in response to a first force, and the second connection member is configured to shift relative to the second contact member in response to a second force. A high voltage is applied at both ends of the crystal through electrically contacting the first connection member with the first contact member and electrically contacting the second connection member with the second contact member.

Abstract: Methods, devices, systems and apparatus for determining emphysema thresholds for processing a pulmonary medical image are provided. In one aspect, a method includes: determining lung lobe regions in the pulmonary medical image, and, for each of the lung lobe regions, clustering CT values in the lung lobe region to divide the lung lobe region into a first sub region and a second sub region and acquiring a CT value corresponding to an intersection of a first CT value distribution function for the first sub region and a second CT value distribution function for the second sub region in the lung lobe region as an emphysema threshold for the lung lobe region.

Abstract: Methods, devices, and systems for processing ray data are provided. The methods include: smoothing initial ray data based on collection of a detector of a CT device through at least two time windows to obtain smoothed ray data corresponding to each time window having a different window length, the initial ray data including attenuation values of rays passing through an object to be examined and being obtained at a sampling frequency within a specified time period, determining initial fluctuating data based on the initial ray data and smoothed ray data corresponding to one of the time windows, the initial fluctuating data being associated with a fluctuation due to occlusion of the rays by a collimator of the CT device, and removing the fluctuation from the initial ray data to obtain target ray data based on the smoothed ray data corresponding to each time window and the initial fluctuating data.

Abstract: A collimator includes a collimator body formed by 3D printing technology and one or more side plates formed by non-3D printing technology. The collimator body includes first through holes, body side walls, and openings located on at least one side of the collimator body. The first through holes and the openings are enclosed by respective body side walls, extend through the collimator body, and are arranged in an array. The one or more side plates have a thickness smaller than a thickness of the body side walls, and are connected with the at least one side of the collimator body to constitute second through holes together with the openings. Each through hole has a square-frustum-like shape with extension lines intersecting at a focus of an emission source of X rays, such that the X-rays pass through the through hole.

Abstract: A scanning table includes an upper pallet, a lower pallet, a support device, a driving device, an opening belt and an endless belt. The opening belt is fixedly coupled with the lower pallet. The endless belt is fixedly coupled with the upper pallet. A front end of the opening belt is provided with a first driving wheel coupled to the driving device. The lower pallet is driven by the first driving wheel to move in a front-back direction relative to the support device. The endless belt is sleeved on the lower pallet. When the lower pallet moves in the front-back direction relative to the support device, the endless belt moves synchronously with the lower pallet to drive the upper pallet to move in the same direction back and forth relative to the lower pallet.

Abstract: Methods, devices, systems and apparatus for medical imaging, e.g., Magnetic Resonance (MR) imaging or Computed Tomography (CT) imaging, using neural networks are provided. In one aspect, an imaging method includes: determining a first neural network and a second neural network corresponding to a target imaging task, the first neural network including a first neural network parameter and a first neural network model, the second neural network including a second neural network parameter and a second neural network model, obtaining a reconstructed image by performing reconstruction for down-sampling data of a tissue under test using the first neural network, the target imaging task corresponding to the tissue under test, and obtaining an image output by a second neural network as a target image of the tissue under test by performing an image processing operation corresponding to the target imaging task for the reconstructed image using the second neural network.

Abstract: In a CT scanning method of bolus tracking, multiple CT scans are performed on a region of interest (ROI) of a subject while a contrast agent is injected into the subject. In a tracking process of the contrast agent, first and second CT values of the ROI of the subject for first and second CT scans are respectively obtained. If the second CT value is no less than a target threshold, the tracking process is finished. If the second CT value is less than the target threshold, an interval for increasing the second CT value to the target threshold is determined according to the first and second CT values and a first CycleTime representing a duration between starts of the first and second scans. Then a second CycleTime is set based on the interval, and a third scan is performed according to the second CycleTime.

Abstract: Methods, devices, systems and apparatus for determining emphysema thresholds for controlling magnetic resonance imaging are provided. In one aspect, a magnetic resonance imaging method includes: collecting magnetic resonance imaging data as first k-space data by undersampling a magnetic resonance signal, performing parallel imaging reconstruction on the first k-space data to obtain a first image, performing enhancement processing on the first image to obtain a second image that comprises distributional information of image supporting points, and performing constrained reconstruction on the first k-space data by using the second image as a prior image to obtain a third image as a magnetic resonance image to be displayed.

Abstract: Methods, devices, systems and apparatus for dynamic imaging based on echo planar imaging (EPI) sequence are provided. In one aspect, a method includes: obtaining first pre-scanned k-space data by performing a pre-scan for a subject based on a first EPI sequence and pre-scanning parameters, obtaining a pre-scanned image and second pre-scanned k-space data according to the first pre-scanned k-space data, performing a dynamic scan for the subject based on a second EPI sequence and dynamic scanning parameters to generate dynamically-scanned k-space data associated with each of a plurality of dynamic periods in the dynamic scan, and for each of the dynamic periods, generating a residual image according to the dynamically-scanned k-space data of the dynamic period and the second pre-scanned k-space data, and adding the pre-scanned image and the residual image to obtain a dynamic image of the dynamic period.

Abstract: Methods, devices and apparatus for reconstructing a PET image are provided. According to an example of the method, a PET initial image may be reconstructed from PET data obtained by scanning on a target object with a PET device, and an MRI image may be reconstructed from MRI data obtained by scanning on the target object with a MRI device, a fusion image retaining only a boundary of the target object is generated based on the PET initial image and the MRI image, and a PET reconstructed image is obtained by combining the PET initial image with the fusion image, where the definition of the boundary of the target object in the PET reconstructed image is higher than that in the PET initial image.

Abstract: Methods, devices and non-transitory machine readable storage mediums for displaying coronary arteries are provided. In one aspect, a method includes: obtaining a coronary artery model of the coronary arteries, obtaining values of one or more coronary artery parameters of the coronary artery model according to the coronary artery model, determining colors corresponding to the values of the one or more coronary artery parameters, and acquiring a pseudo-color coronary artery model of the coronary arteries by displaying the coronary artery model with the determined colors.

Abstract: Methods, devices and apparatus for CT imaging in a CT system are provided. The CT system includes a CT console, a CT scanner and an image reconstruction computer. In one aspect, a method includes detecting, by the CT console, whether a parameter adjustment instruction is received from a user during a scanning process in which a preview image is generated and displayed to the user. If the parameter adjustment instruction is received, the CT console sends adjusted scan parameters to at least one of the CT scanner or the image reconstruction computer such that the CT scanner and the image reconstruction computer generate a new preview image based on the adjusted scan parameters that are determined according to the preview image. If the parameter adjustment instruction is not received, the CT console displays to the user a CT image generated by the image reconstruction computer after finishing the scanning process.

Abstract: Methods, devices, systems and apparatus for arranging detector sub-modules in a medical device are provided. In one aspect, a detector includes a housing and a plurality of detector modules arranged in parallel along a direction on the housing and configured to detect rays emitted from a radiation source and attenuated by a subject. Each of the plurality of detector modules includes a support extending in the direction and a plurality of detector sub-modules arranged on the support along the direction. A top surface of each of the plurality of detector sub-modules is tangent to a respective spherical surface of a corresponding target sphere of at least two target spheres having different radiuses, and a respective sphere center of each of the at least two target spheres is substantially overlapped with a focal spot of the radiation source.