Abstract: The present disclosure relates to a cavity of a medical device. The cavity may include a bore and an accommodating cavity configured to provide an accommodating space for at least a portion of a couch in a radial direction of the bore. The accommodating cavity may be disposed on an inner wall of the bore and extend along an axial direction of the bore, and the accommodating cavity may be configured to form, with the bore, a connected space in which the at least a portion of the couch is allowed to move along an axial direction of the bore.

Abstract: The present disclosure provides methods and systems for image processing. The methods may include determining a scanning protocol of a medical scan of a target subject. The scanning protocol may include a first parameter value of a first operation parameter of each of one or more post-processing operations. The first operation parameter of a post-processing operation may relate to whether the post-processing operation needs to be performed on target imaging data collected in the medical scan. The methods may include obtaining the target imaging data of the target subject collected in the medical scan that is performed according to the scanning protocol. The methods may further include performing at least part of the one or more post-processing operations on the target imaging data based on the first parameter value of the first operation parameter of each of the one or more post-processing operations.

Abstract: The present disclosure provides an automated scanning system and method. The method may include obtaining region information of a region. The method may also include determining, based on the region information, a route from a start position of a scanning apparatus to a target position. The method may further include causing the scanning apparatus to move to the target position along the route. The method may still further include identifying a target portion of a subject based on image data obtained from at least one optical device set on the scanning apparatus, and causing the scanning apparatus to scan the target portion of the subject.

Abstract: A method for determining hemodynamic parameters may be provided. The method may include obtaining image data of a subject. The method may include generating a first vascular model and a second vascular model based on the image data and coupling the first vascular model with the second vascular model using an intermediate model to form a coupled vascular model. The method may also include setting at least one of a first boundary condition of the first vascular model or a second boundary condition of the second vascular model and determining a flow field distribution of the coupled vascular model based on the at least one of the first boundary condition or the second boundary condition. The method may further include determining hemodynamic parameters based on the flow field distribution.

Abstract: Embodiments of the present disclosure provide methods and systems for imaging data process and methods and systems for imaging. The method for imaging data process may include obtaining imaging data of an object acquired from a first device; obtaining physiological feature data of the object acquired from a second device, wherein the physiological feature data at least includes synchronous physiological feature data of the imaging data; and storing the imaging data of the object associatively with the physiological feature data.

Abstract: The present disclosure provides methods and systems for image segmentation. The methods may include obtaining an initial image. The methods may include determining, based on the initial image, at least one target image using a positioning model. Each of the at least one target image may include a portion of a target region. The methods may further include, for the each of the at least one target image, determining an initial segmentation result of the portion of the target region using a segmentation model.

Abstract: The present disclosure is related to systems and methods for magnetic resonance imaging (MRI). The method includes obtaining a plurality of target sets of k-space data by filling target MR signals acquired by a plurality of coils of an MRI device into k-space along a corkscrew trajectory. The method includes obtaining a coil sensitivity of each of the plurality of coils. The method includes obtaining a point spread function corresponding to the corkscrew trajectory. The method includes generating a target image based on an objective function.

Abstract: The present disclosure relates to systems and methods for reducing noise in an imaging system. The methods may include determining an imaging sequence for imaging a subject. When imaging the subject based at least on the imaging sequence, the imaging system may generate a first noise. The methods may further include obtaining, based on the imaging sequence, noise reduction data from a database. And the method may also include causing a generation device to produce a second noise based on the noise reduction data. The second noise may be configured to interfere with the first noise to reduce the first noise.

Abstract: A radiotherapy system is provided. The radiotherapy system may include a treatment component, an imaging component, and a table being movable between the treatment component and the imaging component along a first direction in a first coordinate system. The table may have a plurality of cross sections perpendicular to the first direction. The table may include a positioning line that extends along the first direction and have a positioning feature. The positioning feature may have a plurality of feature values. Each feature value may correspond to one of the plurality of cross sections.

Abstract: Systems and methods for medical image reconstruction are provided. The systems may determine a target temporal resolution of a target scan on a target subject within a scanning angle range. The system may determine, based on the target temporal resolution, a plurality of reconstruction angle ranges each of which being within the scanning angle range. The system may obtain scan data acquired by causing an imaging device to perform the target scan on the target subject within the scanning angle range. The system may generate a plurality of reconstruction images corresponding to the plurality of reconstruction angle ranges based on the scan data.

Abstract: The present disclosure provides systems for controlling movement of a table supporting an object. The system may include: a first control sub-system configured to generate a first control instruction; a second control sub-system configured to generate a second control instruction; a table control sub-system operably coupled to the table; and a master controller configured to receive the first control instruction from the first control sub-system, or the second control instruction from the second control sub-system, generate a third control instruction based on the first control instruction or the second control instruction, and transmit the third control instruction to the table control sub-system. The table control sub-system may be configured to generate a control signal based on the third control instruction, and cause the table to move based on the control signal.

Abstract: The present disclosure may provide a radiation system. The radiation system may include a treatment head, a detector, a plurality of imaging sources, and a gantry. The treatment head, the detector, and the plurality of imaging sources may be mounted on the gantry. The treatment head may be configured to deliver a treatment beam toward an object. The plurality of imaging sources may be configured to deliver a plurality of imaging beams toward the object. At least two of the plurality of imaging sources may share the detector. The detector may be configured to detect at least two of the plurality of imaging beams. The detected at least two imaging beams may be emitted by different imaging sources of the at least two imaging sources.

Abstract: A method may include obtaining a plurality of imaging signals collected by applying a wave encoding gradient to a region of interest (ROI) of a subject. The method may also include obtaining a plurality of auxiliary signals associated with the ROI. The method may also include obtaining a point spread function corresponding to the wave encoding gradient. The method may also include determining, based on the plurality of auxiliary signals, temporal information relating to at least one temporal dimension of the ROI. The method may also include determining, based on the plurality of auxiliary signals, the plurality of imaging signals, and the point spread function, spatial information relating to at least one spatial dimension of the ROI. The method may also include generating at least one target image of the ROI based on the temporal information and the spatial information.

Abstract: A system and method relating to a radiation based imaging are provided. The system may include a radiation source, a detector, a first grid, and a second grid. The detector may include a plurality of detector cells. The first grid may be located between the radiation source and the detector and include a plurality of first radiation transmitting sections. The second grid may be located between the first grid and the detector and include a plurality of second radiation transmitting sections. An extending direction of at least one of the plurality of first radiation transmitting sections may be different from that of at least one of the plurality of second radiation transmitting sections.

Abstract: Systems and methods for image optimization are provided. The system may obtain an image to be processed. The system may determine a quality feature of the image. The system may input the image and the quality feature into an image processing model. The system may also determine an optimized image of the image based on an output of the image processing model.

Abstract: The present disclosure relates to a coil assembly of an MRI device. The MRI device may be configured to perform an MR scan on a subject. The coil assembly may include one or more coil units, a substrate, and a sensor mounted within or on the substrate. The one or more coil units may be configured to receive an MR signal from the subject during the MR scan. The substrate may be configured to position the one or more coil units during the MR scan. The one or more coil units may be mounted within or on the substrate. The sensor may be configured to detect a motion signal relating to a physiological motion of the subject before or during the MR scan.

Abstract: A method for data storage may be provided. The method may include storing metadata of an image file onto a first storage device. The method may include dividing image data of the image file into at least one sub-image data set. The method may also include storing each sub-image data set of the at least one sub-image data set, onto a second storage device of at least one second storage device. The method may further include storing access information of the at least one second storage device onto the first storage device.

Abstract: The method may include obtaining a first set of imaging data affording a sagittal view relating to a subject and a first couch supporting the subject. The first couch may have a plurality of first positions reflected in the first set of imaging data as a first conformation. The method may also include determining a displacement field associated with a first set of imaging data with respect to the reference conformation based on the first conformation and a reference conformation. The method may further include adjusting the first set of imaging data with respect to the reference conformation based on the displacement field. In some embodiments, the method may include obtaining an image of the subject with respect to the reference conformation based on the adjusted first set of imaging data.

Abstract: The present disclosure provides a treatment system including a radiotherapy device, a magnetic resonance imaging (MRI) device, and a support. The radiotherapy device is configured to emit a radiation beam. The MRI device may include a magnet assembly for providing a magnet field in an accommodation space. The support may be configured to be connected with the radiotherapy device, and the radiotherapy device may be configured to rotate around at least one rotation axis.

Abstract: The embodiments of the present disclosure provide a method and device for controlling a high-voltage generator, the method includes: obtaining a current output voltage and a target output voltage of the high voltage generator; determining an outer loop control parameter based on the current output voltage and the target output voltage; obtaining one or more internal physical parameters of the high voltage generator; determining one or more inner loop control parameters based on the one or more internal physical parameters and the outer loop control parameter; and determining a closed loop control parameter based on the one or more inner loop control parameters to control the high voltage generator.