Abstract: Embodiments of the present disclosure provide a method, a system and a non-transitory computer readable medium for imaging. The method may include: obtaining historical configuration information; adjusting the historical configuration information to generate target configuration information matching a current scanning condition; and performing, using a first device, an imaging operation on the detection object based on the target configuration information, wherein an account, a current scanning device, an operator, or a detection object under the current scanning condition is different from an account, the historical scanning device, an operator, or a detection object under the historical scanning condition, respectively.

Abstract: The present disclosure relates to systems and methods for image reconstruction. The system may obtain an initial image to be processed. The system may generate a reconstructed image by performing a plurality of iteration steps on the initial image. Each of the plurality of iteration steps may include a first optimization operation and at least one second optimization operation. The first optimization operation and the at least one second optimization operation may be executed sequentially. The first optimization operation may include receiving an image to be processed in the iteration step and determining an updated image by preliminarily optimizing the image to be processed. The at least one second optimization operation may include determining an optimized image by reducing interference information of the updated image and designating the optimized image as a next image to be processed in a next iteration step. The interference information may include noise information and/or artifact information.

Abstract: The embodiments of the present disclosure provide an imaging system, the imaging system may include a volume coil; a support assembly, wherein the volume coil is configured to surround an outer side of the support assembly or the support assembly is configured to surround an outer side of the volume coil; and a detector, installed on the support assembly and configured to receive gamma photons generated by radionuclides from a subject.

Abstract: The present disclosure relates to systems and methods for image generation. The methods may include obtaining projection data generated by a scanner; generating, based on a first weighting function, a first image by back-projecting the projection data, the first image having a first region corresponding to a first part of the object; generating, based on a second weighting function, a second image by back-projecting the projection data, the second image having a second region corresponding to the first part of the object, the second region of the second image presenting a better CT number uniformity than the first region of the first image; and generating a third image based on the first image and the second image.

Abstract: The embodiments of the present disclosure provide a method for radiation therapy guidance. The method may include obtain first surface data of a target object to be treated by using an optical camera, wherein the first surface data may reflect the body surface condition of the target object before a treatment fraction; obtain a historical anatomical image of the target object; and determine whether an anatomical image of the target object needs to be reshot for the treatment fraction based on the historical anatomical image and the first surface data.

Abstract: The embodiments of the present disclosure provide systems and methods for controlling medical operations. The system may include: at least one storage medium including a set of instructions; and at least one processor in communication with the at least one storage medium, wherein when executing the set of instructions, the at least one processor is directed to cause the system to perform operations including: obtaining a call instruction of virtual caregiver information, wherein the virtual caregiver information includes accompany information associated with a caregiver, the caregiver is related to an object, and the accompany information includes at least one of visual information, auditory information, or tactile information; and directing a display device to display the virtual caregiver information based on the call instruction.

Abstract: A method may include obtaining a first acquisition time period related to a scan of a first modality performed on an object. The method may also include obtaining one or more second acquisition time periods related to a scan of a second modality performed on the object. The method may also include obtaining, based on the first acquisition time period and the one or more second acquisition time periods, target data of the object acquired in the scan of the first modality. The method may also include generating one or more target images of the object based on the target data.

Abstract: Systems and methods for motion correction in medical imaging are provided in the present disclosure. The systems may obtain at least two image sequences relating to a subject. Each of the at least two image sequences may be reconstructed based on image data that is acquired by a medical imaging device during one of at least two time periods. The subject may undergo a physiological motion during the at least two time periods. The systems may generate, based on the at least two image sequences, at least one corrected image sequence relating to the subject by correcting, using a motion correction model, an artifact caused by the physiological motion.

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: An anti-scatter grid, a detector with such an anti-scatter grid and a radiation imaging system including such a detector with an anti-scatter grid are provided. The anti-scatter grid includes at least one grid wall. The parameters of the grid wall may be adjusted to arrive a uniform scatter-to-primary ratio. The parameters of the grid wall comprise thickness, height, shape, or position of the grid wall, or width of interspace between two grid walls. The detector includes the anti-scatter grid, at least one photosensor, and at least one scintillator. The radiation system includes a radiation generator, a radiation detector with the anti-scatter grid, and a processor.

Abstract: The present disclosure relates to a medical system. The medical system may determine a working phase of the medical system. The working phase of the medical system may include a positioning phase, a scanning phase, and/or a scanning completion phase. The medical system may determine a position of a target portion of an object in the medical system based on one or more images associated with the object captured by an imaging sensor. The medical system may further control an operation of a positioning lamp of the medical system based on the working phase of the medical system and the position of the target portion of the object in the medical system.

Abstract: The present disclosure provides systems and methods for adjusting a multi-leaf collimator (MLC) in a treatment process according to a treatment plan or a portion thereof. The method may comprise: moving one or more leaves of a multi leaf collimator (MLC), and forming one or more closed leaf pairs in moving process, the moving including: obtaining an offset for each closed leaf pair of the one or more closed leaf pairs, wherein the offset is no larger than a predetermined threshold, and the predetermined threshold is determined in a treatment planning process that generates a radiation treatment plan; and causing the one or more closed leaf pairs to move based on one or more offsets corresponding to the one or more closed leaf pairs, before or during a implementation of the radiation treatment plan.

Abstract: The present disclosure provides methods and systems for image processing. The methods may include obtaining original projection data of a target subject. For each of at least one slice location of the target subject, the methods may include generating a plurality of candidate slice images of the slice location based on a plurality of distance-weight relationships and the original projection data. Each of the plurality of distance-weight relationships may indicate a weight of a portion of the original projection data acquired by the radiation source and a distance from the radiation source to the slice location when acquiring the portion of the original projection data. The methods may further include generating at least one target medical image of the target subject based on the plurality of candidate slice images of each of the at least one slice location.

Abstract: The disclosure relates to a system and method for correcting PET image data. PET image data of a first part of a subject may be obtained. CT image data of a second part of the subject may be obtained. The first part may include the second part. PET voxel data of the first part may be obtained based on the PET image data of the first part. A relationship between the CT image data and PET voxel data of the second part may be determined. CT image data of a third part of the subject may be determined based on the relationship and PET voxel data of the third part. The first part may include the third part. An attenuation map may be determined based on the CT image data of the second part and the third part. The PET image data of the first part may be corrected based on the attenuation map.

Abstract: A high-voltage generator may be provided. The high-voltage generator may include a rectifying unit, a grid-controlled unit, and a shielding device. The rectifying unit may be configured to rectify an electric current generated in the high-voltage generator. The grid-controlled unit may be configured to generate a high voltage and electrically connected to the rectifying unit. The grid-controlled unit may have a conductive surface that opposes the rectifying unit. The shielding device may be located between the rectifying unit and the conductive surface of the grid-controlled unit. The shielding device may be spaced apart from the rectifying unit and the conductive surface of the grid-controlled unit. The shielding device may be electrically connected to the rectifying unit.

Abstract: A method for irradiation based on a fluence map includes determining a shield type of each row of a fluence map. The method also includes determining, for each of the two rows, a movement curve indicating a relationship between an irradiation dose in the each of the two rows and a moving position of a leaf pair corresponding to the each of the two rows. The method further includes determining an initial irradiation dose for each of the movement curves and synchronizing one of the movement curves based on the shield types of the two rows. The method also includes selecting at least one irradiation dose of at least one point on an irradiation dose axis and generating a control point according to the selected irradiation dose.

Abstract: Methods and systems for medical imaging are provided. A method may include: obtaining radiation events; determining first response information based on the radiation events, the first response information including first time information of the radiation events; determining second response information based on the radiation events, the second response information including response information corresponding to an anomaly detection unit and lacking time information; and generating an image based on the first response information and the second response information.

Abstract: The present disclosure provides a system and method for image reconstruction. The method may include obtaining image raw data; determining, based on a complexity of a reconstruction task of the image raw data and processing capacities of one or more workstations, from the one or more workstations, one or more hardware resources for processing the image raw data; generating, based on the image raw data and the one or more hardware resources, one or more sub tasks of the reconstruction task; assigning the one or more sub tasks to the one or more hardware resources; obtaining one or more intermediate results corresponding to the one or more sub tasks, the one or more intermediate results being generated by the one or more hardware resources; and generating, based on the one or more intermediate results, a reconstruction result of the image raw data.

Abstract: The embodiments of the present disclosure provide a method for classifying a tracer, a system and a device, and a storage medium. The method for classifying the tracer comprises obtaining imaging data related to an emission computed tomography (ECT) scan of a target object, the target object being injected with a tracer during the ECT scan; and determining classification information of the tracer by processing the imaging data using a tracer classification model, the tracer classification model being a trained machine learning model.

Abstract: A method and a system for noise analysis may be provided. A plurality of signals of a target object may be obtained. A first value of a first signal representation and a second value of a second signal representation of the target object may be determined based on the plurality of signals. A value of a noise parameter may be determined based on the first value of the first signal representation and the second value of the second signal representation.