Abstract: The present disclosure may provide a system. The system may include a magnetic resonance imaging (MRI) device configured to perform an imaging of a subject. The MRI device may includes a cryostat. The cryostat may include a first cooling chamber and a second cooling chamber that are in fluid communication through a connection conduit. The connection conduit may be located on a side of a central axis of the first cooling chamber or a central axis of the second cooling chamber. The system may include a radiation source configured to emit a radiation beam toward the subject. The radiation source may be positioned between the first cooling chamber and the second cooling chamber such that the first cooling chamber and the second cooling chamber are outside of a radiation range of the radiation beam.

Abstract: The embodiments of the present disclosure provide a method for dose verification. The method may include obtaining a predicted radiation auxiliary image of a target object at a target radiation time point; determining a target dose strategy based on the predicted radiation auxiliary image; performing, based on the target dose strategy, treatment in a current radiation fraction on the target object.

Abstract: A method for generating a radiation treatment plan is provided. The method may include determining a set of one or more optimization goals for radiation delivery by a therapeutic radiation delivery apparatus. The method may also include determining a plan for radiation delivery from a radiation source of the therapeutic radiation delivery apparatus. The radiation source may be capable of continuously rotating around a subject. The plan may include a plurality of radiation segments. Each radiation segment may be characterized by at least one parameter selected from a start angle, a stop angle, a two-dimensional segment shape, or a segment MU value such that the plurality of radiation segments satisfy the set of one or more optimization goals by superimposing at least two radiation segments from at least two different rotations into a target volume of the subject.

Abstract: The present disclosure relates to a system and a method. The system may include a magnetic resonance imaging (MRI) apparatus configured to acquire MRI data with respect to a region of interest (ROI) and a therapeutic apparatus configured to apply therapeutic radiation to at least one portion of the ROI. The MRI apparatus may include a plurality of main magnetic coils arranged coaxially along an axis, a plurality of shielding magnetic coils arranged coaxially along the axis, and a cryostat in which the plurality of main magnetic coils and the plurality of shielding magnetic coils are arranged.

Abstract: An artificial tanzanite comprises aluminosilicate and vanadium, wherein the content of the aluminosilicate is in a range from 1 mass % to 30 mass % and the content of the vanadium is in a range from 1000 ppm to 40000 ppm. The artificial tanzanite is prepared by a method comprising: providing a synthetic raw material, wherein the synthetic raw material comprises the aluminosilicate, silicon-containing oxide, vanadium-containing oxide, and calcium-containing salt; and heating the synthetic raw material to a synthetic temperature, and keeping the synthetic raw material under a synthetic pressure to carry out synthetic reaction to form the artificial tanzanite after a period of synthetic time.

Abstract: The present disclosure is related to a microwave source. The microwave source may include a cathode heater and a thermionic emitter. The cathode heater may include a first component, and a second component enclosing at least a portion of the first component. The thermionic emitter may be configured to release electrons when the thermionic emitter is heated by the cathode heater. At least a portion of the second component of the cathode heater may be in contact with the thermionic emitter.

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 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: A radiation therapy system is disclosed. The radiation therapy system includes a gantry, a first radiation source, and a second radiation source. The gantry is configured to have a cavity extending in a direction along a rotation axis, and the cavity is configured to house a target object. The first radiation source is mounted on the gantry, and configured to emit a treatment beam to a treatment area of the target object. The second radiation source is mounted on the gantry, and configured to emit an imaging beam to an imaging area of the target object. The treatment area partially overlaps the imaging area. A rotation plane of the first radiation source and a rotation plane of the second radiation source are distributed in a direction along the rotation axis.

Abstract: The present disclosure relates to a radiation system. The system may include a treatment assembly, an imaging assembly, a first gantry, and a second gantry. The treatment assembly may include a first radiation source configured to deliver a treatment beam and have a treatment region. The first gantry may be configured to support the first radiation source. The imaging assembly may include a second radiation source and a radiation detector. The second radiation source may be configured to deliver an imaging beam and the radiation detector may be configured to detect at least a portion of the imaging beam. The imaging assembly may have an imaging region. The second gantry may be configured to support the second radiation source and the radiation detector, wherein the second radiation source is located within the second gantry. The treatment region and the imaging region at least partially overlap.

Abstract: The present disclosure provide a device. The device may include: a pedestal; a rotation base disposed on the pedestal; an imaging component disposed on the rotation base; and a treatment component disposed on the rotation base. The imaging component and the treatment component may be disposed on a same side of the rotation base, and the imaging component and the treatment component may be configured to rotate around a first rotation axis of the rotation base.

Abstract: The present disclosure relates to a system and a method. The system may include a first device including a treatment head configured to emit a radiation beam. The system may include a second device comprising a body. The body may include one or more openings at a bottom of the recess that allow passage of the radiation beam substantially free of the interference by the body.

Abstract: The present disclosure provides a magnetic resonance imaging (MRI) device. The MRI device may include a main magnet configured to generate a main magnetic field. The main magnet may form an accommodation space configured to accommodate a target object. The main magnet may include at least one group of main field coils. A direction of the main magnetic field generated by the at least one group of main field coils may form a preset angle with an axial direction of the accommodation space. The at least one group of main field coils may include a first group of main field coils and a second group of main field coils that are arranged oppositely along a radial direction of the accommodation space. Each of the first group of main field coils and the second group of main field coils may bend towards each other.

Abstract: A method for quality assurance may include obtaining a state of a medical device. The method may also include obtaining a target plan of a target subject. The method may also include determining a prediction result based on the state of the medical device and the target plan of the target subject. The method may also include determining whether a quality assurance test passes based on the prediction result.

Abstract: The present disclosure relates to a slip ring assembly. The slip ring assembly may include a first slip ring, a second slip ring, and a transmission component. The transmission component may be configured to facilitate at least one of: data transmission of the first slip ring, data transmission of the second slip ring, power transmission of the first slip ring, or power transmission of the second slip ring.

Abstract: A heat dissipation device includes a housing assembly, a sliding assembly, and a linkage assembly. The housing assembly includes a receiving cavity and a cooling hole communicating with the receiving cavity. The sliding assembly includes a sliding member and a rack. The sliding member is located in the receiving cavity and slidably connected to a side of the housing assembly with the cooling hole, the rack is fixedly connected to the sliding member. The linkage assembly includes a rotating shaft and a gear. The rotating shaft and the gear are located on the same side of the sliding member, the rotating shaft is fixed on the housing assembly and extends through the gear, the gear is rotatably sleeved on the rotating shaft and is engaged with the rack to drive the sliding member to slide, thereby adjusting an area of the cooling hole blocked by the sliding member.

Abstract: The embodiments of the present disclosure provide a radiation therapy device. The radiation therapy device may comprise a beam generating device, a scanning magnet, and one or more focusing magnets. The beam generating device may be configured to generate a charged particle beam. The scanning magnet may be configured to diverge the charged particle beam. The one or more focusing magnets may be configured to deflect the charged particle beam diverged by the scanning magnet.

Abstract: This present disclosure provides methods and systems processing a three-dimensional image. The method may include: generating a three-dimensional medical image of a target object based on medical imaging data of the target object, and displaying the three-dimensional medical image in a three-dimensional space; obtaining one or more processing instructions of a user; and generating a target medical model by contouring, in the three-dimensional space, based on the one or more processing instructions, the three-dimensional medical image. The three-dimensional medical image may be generated based on medical imaging data of the target object. The target medical model may include three-dimensional contour information.

Abstract: The present disclosure relates to a therapeutic apparatus including an MRI apparatus configured to acquire MRI data with respect to a region of interest. The MRI apparatus may include a plurality of main magnetic field coils coaxially arranged along an axis. The MRI apparatus may also include a plurality of shielding coils arranged coaxially along the axis. A current within at least one of the shielding coils may be in the same direction with a current within the main magnetic field coils.

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.