Abstract: The present disclosure is related to systems and methods for medical imaging. The method includes determining a sequence of scan states of a medical device for a sequence of regions of interest (ROIs) of a subject. Each of the sequence of scan states corresponds to an ROI in the sequence of ROIs. When the medical device is in a scan state of the sequence of scan states, an isocenter of the medical device is aligned with a center of the corresponding ROI. The method includes generating a set of controlling information of the medical device based on the sequence of scan states. Each of the set of controlling information is configured to switch the medical device to a corresponding scan state in the sequence of scan states. The method includes controlling the medical device to scan the sequence of ROIs. Before scanning each of the sequence of ROIs, the medical device is positioned to the corresponding scan state according to the corresponding controlling information.

Abstract: The disclosure provides a system for EGRT. The system may include a radiotherapy device for treating a subject. The radiotherapy device may include a scintillation camera that is directed at an ROI of the subject. The subject may be injected with a radioactive tracer or implanted with a radioactive marker before treatment. The ROI may undergo a physiological motion during the treatment. The system may deliver a treatment session to the subject by the radiotherapy device. During the treatment session, the system may acquire a target image of the ROI indicative of a distribution of the radioactive tracer or the radioactive maker in the ROI by the scintillation camera, and adapt a radiation beam to be delivered to the subject with respect to the physiological motion of the ROI by adjusting the radiation beam based on the target image.

Abstract: A radiation system may include a treatment head configured to deliver a treatment beam to an object, a first assistance assembly configured to facilitate a delivery of the treatment beam, a first imaging radiation source configured to direct a first imaging beam toward the object, a first detector configured to detect at least a portion of the first imaging beam, and a second assistance assembly configured to facilitate a delivery of the first imaging beam. The gantry may include a first gantry portion having a rotation axis and a second gantry portion located next to the first gantry portion along the rotation axis. The treatment head, the first imaging radiation source, and the first detector may be disposed on the first gantry portion. The first assistance assembly and the second assistance assembly may be housed within the second gantry portion.

Abstract: A system for equalizing a pressure in an ionization chamber of a radiation device is provided. The system may include the ionization chamber including: a chamber housing including one or more chamber walls; a chamber volume inside the chamber housing, the chamber volume being filled with a radiation sensitive material; and a pressure adjustment apparatus operably coupled to the chamber volume via at least one wall of the one or more chamber walls, the pressure adjustment apparatus being configured to equalize a first pressure of the radiation sensitive material inside the chamber volume and a second pressure of ambient air outside the chamber housing.

Abstract: Embodiments of the present disclosure provide a method for parameter imaging. The method includes: obtaining two scan images of an object, wherein scanning ranges of the two scan images have an overlapping region; obtaining frame information by framing the two scan images or two sets of scan data corresponding to the two scan images, wherein the overlapping region in the two scan images corresponds to two frames; and determining metabolic information of a tracer inside the object based on the frame information.

Abstract: The present disclosure may provide imaging method and system. The method may include obtaining a plurality of signals relating to a region of interest (ROI) of an object acquired by applying to the object a plurality of chemical exchange and saturation transfer (CEST) preparations with a plurality of offset frequencies; and generating an image of the ROI based on the plurality of signals. The plurality of CEST preparations may be configured to excite proton exchange of a substance in the ROI. The plurality of CEST preparations may be divided into one or more groups. Each of the one or more groups may include multiple CEST preparations with a same offset frequency among the plurality of offset frequencies. After a last CEST preparation in each of the one or more groups is applied to the object, the substance may reach a saturation degree that exceeds a saturation threshold.

Abstract: The present disclosure relates to a C-arm-based device. The C-arm-based device may include a C-arm component and a connection component. The C-arm component may include a first arm section and a second arm section. The connection component may include a first guiding section and a second guiding section separately disposed on a base. The first arm section is movably connected to the first guiding section. The second arm section is movably connected to the second guiding section.

Abstract: This disclosure may provide a system and a method. The method may include obtaining one or more sets of reference signals collected by a coil of a magnetic resonance imaging (MRI) device in a pre-scan. The pre-scan may be performed on a subject before an MRI scan of the subject. The method may also include obtaining a first fault detection model. The first fault detection model may be a trained machine learning model. The method may further include determining whether the coil has a failure based on the one or more sets of reference signals and the first fault detection model.

Abstract: A radiation therapy system may include a magnetic resonance imaging (MRI) device configured to acquire MRI data with respect to a region of interest (ROI). The MRI device may include a main magnet that is around a longitudinal axis and configured to generate a magnetic field. The MRI device may also include a radiation therapy device configured to perform a treatment on at least one portion of the ROI by delivering, based on the MRI data, therapeutic radiation to the at least one portion of the ROI. The radiation therapy device may be rotatable around the longitudinal axis. The MRI device may also include a first shielding structure configured to provide interference shielding for the MRI device or the radiation therapy device. The radiation therapy device may be rotatable relative to the first shielding structure around the longitudinal axis.

Abstract: Systems and methods for image correction are provided. The systems and methods may obtain raw data of a target object. The systems and methods may determine, based on the raw data of the target object, a target phase. The systems and methods may generate a first image corresponding to the target phase. The systems and methods may determine, using a preset evaluation tool, an image quality evaluation result of the first image. In response to determining that the image quality evaluation result of the first image does not satisfy a preset condition, the systems and methods may generate a set of corrected raw sub-data of the target object corresponding to the target phase by correcting a set of raw sub-data of the target object corresponding to the target phase. The systems and methods may generate, based on the set of corrected raw sub-data of the target object, a corrected image corresponding to the first image.

Abstract: The present disclosure provides systems and methods for controlling an X-ray imaging device. The method may include causing an X-ray source to emit X-rays to irradiate a subject. The method may also include generating an X-ray image of the subject. The X-ray image may be generated using a detector that is arranged to face the X-ray source to detect a portion of the X-rays that pass through the subject. And the method may further include causing to project, using an optical projection device, the X-ray image of the subject on a surface of the subject.

Abstract: Systems and methods for data transmission may be provided. The system may at least include a data transmission module. The system may obtain MR signals from one or more RF coils. The system may generate, via a first portion of the data transmitting module, first data based on the MR signals. The system may generate, via a second portion of the data transmitting module, second data based on the first data. The second portion of the data transmitting module may connect to the first portion of the data transmitting module wirelessly. The system may further store the second data in a non-transitory computer-readable storage medium.

Abstract: A superconducting magnet may include magnet coils including at least one group of outer coils and at least one group of inner coils, a container including an accommodating space, at least one first chamber that is disposed within the accommodating space and houses the at least one group of the inner coils, and at least one second chamber that is disposed within the accommodating space and houses the at least one group of the outer coils. The at least one first chamber and the at least one second chamber may be configured to be filled with a cooling medium and are in fluid communication with each other. The cooling medium may be configured to cool the magnet coils to a superconducting state.

Abstract: The present disclosure provides systems and methods for processing a 3D image. A method may include for an orientation of the 3D image, obtaining, from the 3D image, a plurality of slices of the orientation; processing the plurality of slices of the orientation by applying a conversion model; and determining a converted 3D image of the orientation based on the plurality of processed slices of the orientation.

Abstract: A method for magnetic resonance imaging (MRI) may include obtaining imaging signals related to a region of interest (ROI) of a subject. The method may also include selecting a portion of the imaging signals as auxiliary signals associated with at least one temporal dimension of the ROI. The method may also include generating at least one target image associated with the at least one temporal dimension of the ROI based on the imaging signals and the auxiliary signals.

Abstract: The present disclosure is related to systems and methods for motion signal recalibration. The method includes obtaining a motion signal of a subject based on positron emission tomography (PET) data of the subject. The motion signal may represent a plurality of motion cycles. The method includes determining a distribution of the motion cycles. The distribution of the motion cycles may indicate a probability that each motion cycle of the plurality of motion cycles corresponds to an actual motion cycle. The method includes correcting the motion cycles of the motion signal based on the distribution of the motion cycles to obtain corrected motion cycles. The method includes reconstructing a PET image by gating the PET data based on the corrected motion cycles.

Abstract: The present disclosure relates to systems and methods for image processing. The methods may include obtaining imaging data of a subject, generating a first image based on the imaging data, and generating at least two intermediate images based on the first image. At least one of the at least two intermediate images may be generated based on a machine learning model. And the at least two intermediate images may include a first intermediate image and a second intermediate image. The first intermediate image may include feature information of the first image, and the second intermediate image may have lower noise than the first image. The methods may further include generating, based on the first intermediate image and at least one of the first image or the second intermediate image, a target image of the subject.

Abstract: The present disclosure relates to systems and methods for clock synchronization. The system may include a reset signal generator connected with a plurality of detectors. The reset signal generator may be configured to generate a set of preliminary reset signals to be detected and transmit the set of preliminary reset signals to the plurality of detectors. Each of the set of preliminary reset signals may have a different phase. Each of the plurality of detectors may be configured to generate first feedback data for each of the set of preliminary reset signals and transmit the first feedback data to the reset signal generator. The reset signal generator may be further configured to generate, for each of the plurality of detectors, a reset signal based on the first feedback data and transmit the reset signal to each of the plurality of detectors. Each of the plurality detectors may be further configured to execute a clock synchronization in itself based on the reset signal.

Abstract: The present disclosure provides computer-aided diagnosis systems and methods. The method may include obtaining multiple medical images of one or more bones; for at least one of the multiple medical images, detecting one or more bone fracture regions of the one or more bones in the medical image; causing a management list to be displayed for managing the one or more bones; receiving an instruction related to selecting at least one of the one or more bones, the instruction being generated through the management list; and upon receiving the instruction, causing the following to be displayed: at least one of one or more reconstructed bone images related to the at least one selected bone; or a marker of the one or more detected bone fracture regions related to the at least one selected bone.

Abstract: Systems and methods for image processing are provided in the present disclosure. The systems and methods may obtain an image; determine a current resolution level of the image; determine, based on the current resolution level of the image, from a group of resolution level ranges, a reference resolution level range corresponding to the image; determine a target processing model corresponding to the reference resolution level range; and/or determine a processed image with a target resolution level by processing the image using the target processing model, the target resolution level of the processed image being higher than the current resolution level of the image.