Abstract: An imaging device is provided. The imaging device includes: one or more imaging sources; and a plurality of detectors combined by joining, the plurality of detectors being configured to receive one or more imaging beams emitted by the one or more imaging sources.

Abstract: An imaging phantom assembly includes a phantom body and one or more coils. At least one part of at least one of the one or more coils is arranged in the phantom body.

Abstract: Systems and methods for four-dimensional CT scan are provided. The methods may include determining a first region of a subject and a second region. A movement of the subject may occur within the second region. The methods may further include generating a first image set by performing, based on a first operation parameter corresponding to a first scan, the first scan on the first region of the subject, and generating a second image set by performing, based on a second operation parameter corresponding to a second scan, the second scan on a second region of the subject. The methods may further include obtaining movement information corresponding to the movement of the subject and determining a final image set based on the first image set, the movement information, and the second image set.

Abstract: The present disclosure is related to systems and methods for radiation. The method may include obtaining a plurality of reference images of a target of a subject and reference physiological motion information of the subject. The plurality of reference images and the reference physiological motion information may be acquired in a radiation period. The method may include establishing a correlation model based on the plurality of reference images and the reference physiological motion information. The method may include monitoring real-time motion information of the target based on the correlation model during a radiation operation performed during the radiation period.

Abstract: The present disclosure may provide a radiation system including a first rotation portion, a second rotation portion, a treatment head, one or more imaging sources, and at least one detector. At least a portion of the treatment head may be disposed in the first rotation portion. At least one of the one or more imaging sources may be disposed in the second rotation portion. The second rotation portion may be able to rotate independently from the first rotation portion.

Abstract: The present disclosure is related to systems and methods for radiation. The method may include obtaining a plurality of reference images of a target of a subject and reference physiological motion information of the subject. The plurality of reference images and the reference physiological motion information may be acquired in a radiation period. The method may include establishing a correlation model based on the plurality of reference images and the reference physiological motion information. The method may include monitoring real-time motion information of the target based on the correlation model during a radiation operation performed during the radiation period.

Abstract: A quality assurance (QA) method for a radiotherapy device, a QA device for a radiotherapy device, and a computer device. The radiotherapy device includes an electronic portal imaging device (EPID). The QA method for the radiotherapy device includes: obtaining an image sequence based on acquirement of EPID, the image sequence comprising one or more correction images for correcting the EPID, and one or more portal images for a QA object; and determining a QA result of the QA object of the radiotherapy device according to a calibration parameter corresponding to the one or more correction images and according to the one or more portal images.

Abstract: Embodiments of the present disclosure provide a radiotherapy system, comprising a first imaging component, a second imaging component, and a treatment component. The first imaging component and second imaging component may be used to determine a target region of an object and/or to guide an emission of treatment rays. The treatment component may be used to emit the treatment rays toward the target region. An isocenter of the treatment component may coincide with an isocenter of the second imaging component.

Abstract: A method for calibrating a medical device is provided. The medical device may include a magnetic resonance (MR) device. The method may include switching a gradient field in at least one gradient direction of the MR device; obtaining a magnetic flux variation in the at least one gradient direction in at least one portion of a spatial region within a gradient field domain of the MR device using a magnetic flux measurement component; determining a center of the gradient field domain of the MR device based on the magnetic flux variation; and performing a mechanical adjustment on the MR device to locate the center of the gradient field domain at a target position based on the center of the gradient field domain, or adjusting an image reconstruction process to correct or eliminate an impact of inaccuracy of the center of the gradient field domain on a reconstructed image.

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: 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 may provide a radiation system including a first rotation portion, a second rotation portion, a treatment head, one or more imaging sources, and at least one detector. At least a portion of the treatment head may be disposed in the first rotation portion. At least one of the one or more imaging sources may be disposed in the second rotation portion. The second rotation portion may be able to rotate independently from the first rotation portion.

Abstract: The present disclosure provides systems and methods for dynamic multileaf collimator (MLC) tracking. A method may include identifying a plurality of working leaves of the MLC at a control point; determining, for the control point, a signal acquisition region of an electronic portal imaging device (EPID) based on a plurality of planned position trajectories of the plurality of working leaves, wherein the signal acquisition region is part of an imaging plane of the EPID and includes a plurality of acquisition rows; and obtaining an image from the EPID at the control point, wherein the image includes information acquired in the signal acquisition region.

Abstract: The present disclosure is related to systems and methods for radiation. The method may include obtaining a plurality of reference images of a target of a subject and reference physiological motion information of the subject. The plurality of reference images and the reference physiological motion information may be acquired in a radiation period. The method may include establishing a correlation model based on the plurality of reference images and the reference physiological motion information. The method may include monitoring real-time motion information of the target based on the correlation model during a radiation operation performed during the radiation period.

Abstract: A fast DTMF detector for filtering a packetized linear voice signal to identify whether the voice signal contains a DTMF tone. The detector includes a plurality of parallel notch filters for knocking down DTMF tones. The energies of the filtered signals output by the notch filters are calculated and criteria based upon the calculated energies are applied to determine if the voice signal contains a DTMF tone. The criteria include an energy differential test, a twist test, a low frequency tolerance test, a high frequency tolerance test, a packetized linear voice signal energy level test, a dial tone filtered signal energy level test, and a 1004 Hz filtered signal energy level test.

Abstract: A fast DTMF detector for filtering a packetized linear voice signal to identify whether the voice signal contains a DTMF tone. The detector includes a plurality of parallel notch filters for knocking down DTMF tones. The energies of the filtered signals output by the notch filters are calculated and criteria based upon the calculated energies are applied to determine if the voice signal contains a DTMF tone. The criteria include an energy differential test, a twist test, a low frequency tolerance test, a high frequency tolerance test, a packetized linear voice signal energy level test, a dial tone filtered signal energy level test, and a 1004 Hz filtered signal energy level test.

Abstract: The present invention provides a multi-conditioner arrangement of a CMP system. The CMP system according to the present invention comprises a polishing table, a polishing pad positioned on the polishing table, a plurality of carrier heads on the polishing pad functioning in holding semiconductor wafers, and a plurality of conditioners positioned between the two neighboring carrier heads on the polishing pad for recovering the surface texture of the polishing pad. Herein, a plurality of conditioners are in a one-to-one arrangement to a plurality of carrier heads, each conditioner producing a back and forth motion in a radiant direction. Therefore, the lifetime of the polishing pad is extended, the wafer-to-wafer difference is reduced, and spatial coverage is increased.