Abstract: An apparatus for collecting data is provided. According to an example, the apparatus for collection data may include: n number of detector arrays, n number of DAS circuits and a back-end processor. Each of the DAS circuits may include an analog-to-digital converter and a front-end processor coupled with the analog-to-digital converter. Each of front-end processors is coupled with the back-end processor via an independent transmission line. For each of the detector arrays, the detector array may be configured to output analog signals based on detected scanning rays penetrating through a subject. The analog-to-digital converter may be configured to perform an analog-to-digital conversion on the analog signals to generate raw data. The front-end processor may be configured to logarithmically compress the raw data and transmit the logarithmically-compressed raw data to the back-end processor via the transmission line.

Abstract: Methods, devices, and apparatus, including computer programs encoded on a computer storage medium for reconstructing image are provided. In one aspect, a method of reconstructing image includes obtaining scanning data for a subject in a continuous incremental scanning of medical equipment including real crystals for detection, associating each of the real crystals with one or more virtual crystals in a virtual scanning system, determining delay random coincidence data of two virtual crystals connected by a response line in the virtual scanning system, obtaining random coincidence data by denoising the delay random coincidence data based on crystal receiving efficiency for each of the real crystals, and reconstructing an image with the scanning data by taking the random coincidence data into account.

Abstract: An apparatus for collecting data is provided. According to an example, the apparatus for collection data may include: n number of detector arrays, n number of DAS circuits and a back-end processor. Each of the DAS circuits may include an analog-to-digital converter and a front-end processor coupled with the analog-to-digital converter. Each of front-end processors is coupled with the back-end processor via an independent transmission line. For each of the detector arrays, the detector array may be configured to output analog signals based on detected scanning rays penetrating through a subject. The analog-to-digital converter may be configured to perform an analog-to-digital conversion on the analog signals to generate raw data. The front-end processor may be configured to logarithmically compress the raw data and transmit the logarithmically-compressed raw data to the back-end processor via the transmission line.

Abstract: An RT-CT integrated device comprising an RT system and a CT system is disclosed. The radiation-therapy centerline of the RT system and the scanning centerline of the CT system are on a same axis, and the RT system and the CT system are located at a same end of a treatment table.

Abstract: A method and device for multi-sequence scanning are provided. According to an example of the method, when at least two mergeable scanning sequences are obtained from a plurality of scanning sequences, a target scanning area including respective scanning areas of the at least two mergeable scanning sequences may be determined; and then a scanning on the target scanning area may be performed with the at least two mergeable scanning sequences. As at least two scanning sequences satisfying a preset mergeable condition may be extracted from a plurality of scanning sequences, the at least two scanning sequences satisfying the preset mergeable condition may be performed at once.

Abstract: The disclosure includes: judging whether a center line of an object to be scanned is deviated from a rotation axis of a gantry of a CT scanning device; determining a first distance by which the center line of the object to be scanned is deviated from the rotation axis in a case that the center line of the object to be scanned is deviated from the rotation axis; determining according to the first distance a second distance by which the shape filter is to be translated in each projection angle; and controlling the shape filter to make it translate by the second distance in each corresponding projection angle.

Abstract: Methods, devices, and systems for reconstructing Positron Emission Computed Tomography (PET) images are provided. In one aspect, a method includes: for each of coincidence events including at least one true coincidence event and at least one scattering coincidence event, determining an emission path of the coincidence event according to photon information of the coincidence event, the photon information of the coincidence event including time data, position data, and angle data of each of two photons involved in the coincidence event, determining an annihilation position of the coincidence event according to the emission path of the coincidence event and the time data of each of the two photons involved in the coincidence event, and reconstructing a PET image according to the annihilation position, the emission path and the photon information of each of the coincidence events.

Abstract: A method for optimizing CT scanning parameter is disclosed. A target group may be generated from a plurality of reference information samples. Each of the reference information samples may include subject information, information indicating a scanning protocol, one or more scanning parameter values and information indicating reconstructed image quality; the target group can consist of one or more reference information samples with the same subject information and the same scanning protocol. A scanning parameter optimization may be performed according to reconstructed image qualities and scanning parameter values of reference information samples in the target group, so as to acquire a target scanning parameter value of the target group. And according to the target scanning parameter value, a reference X-ray irradiation dose corresponding to the scanning protocol and the subject information of the target group may be determined.

Abstract: Methods of reconstructing a CT image and CT devices are provided in examples of the present disclosure. In one aspect, scanning parameters for a CT device is obtained to perform a scan on a subject, a target reference detector is determined from the reference detectors according to the scanning parameters; the scan is performed on the subject according to the scanning parameters to obtain detection data outputted by the detector and reference detection data outputted by the target reference detector; energy data of the original X-rays emitted by the bulb tube with the scanning parameters is determined according to the reference detection data outputted by the target reference detector; the detection data outputted by the detector is corrected based on the energy data of the original X-rays to obtain scanning data; and the CT image of the subject is reconstructed by performing image reconstruction based on the scanning data.

Abstract: Method, systems and machine-readable storage mediums for reconstructing images are provided. In one aspect, a method includes: acquiring data of a response line, the data including an actual energy parameter of each of photons in a photon pair corresponding to the response line, the actual energy parameter being detected by a detector and within a preset energy range, determining an energy factor of the response line according to the actual energy parameter of each of the photons in the photon pair and a theoretical energy parameter of the photon, obtaining a system parameter according to the energy factor, the system parameter including an element indicating a probability that a photon pair generated in a region of a subject corresponding to an image voxel is received by the detector, constructing a system response model with the system parameter, and reconstructing an image based on the system response model.

Abstract: A method of reconstructing an image that may include in at least one example: determining coincidence events based on detection by a detector during a continuous incremental scanning; determining an axial position for each of the coincidence events; storing data for each of the coincidence events including the axial position in a list mode; sorting the data for each of the coincidence events according to a spatial order; and obtaining an image by performing iterative reconstruction with the sorted data for each of the coincidence events.

Abstract: An accelerator system is provided. According to an example, the accelerator system includes a ray source, a multi-leaf collimator including leaves, a multi-leaf collimator controller and a leaf position determining device. The multi-leaf collimator controller is configured to control each of the leaves to move according to a predetermined position. The leaf position determining device is configured to obtain a three-dimensional image of the multi-leaf collimator, determine a sub-field shape and a sub-field size of the multi-leaf collimator according to the three-dimensional image, determine an actual position of each of the leaves according to the sub-field shape and the sub-field size and obtain an error value for each of the leaves by comparing the actual position with the predetermined position for each of the leaves. In this way, the error value for each of the leaves may be used to control operation of the accelerator system.

Abstract: An image brightness adjustment method and an image brightness adjustment device are provided in the present disclosure. A brightness of a fluoroscopic image obtained by irradiating an object with an initial fluoroscopic dose of X-rays is acquired as an initial brightness. A current load corresponding to the initial brightness is determined according to a relationship between image brightness and loads for the initial fluoroscopic dose, where the current load indicates an X-ray blocking ability of the object. Then, a stable fluoroscopic dose corresponding to the current load is determined according to a relationship between load and stable fluoroscopic dose, where the stable fluoroscopic dose is used to obtain a fluoroscopic image of a predetermined brightness for the object.

Abstract: A Position Emission Tomography (PET) system is provided in the present disclosure. According to an example, the PET system includes a detector and a host computer, where the detector includes: a plurality of detector rings; each of the detector rings including n number of collecting modules arranged in a circumferential direction of the detector ring, where n is an integer greater than 1; a first collecting module of the n number of collecting modules coupled with the host computer; an n-th collecting module of the n number of collecting module coupled with a (n?1)-th collecting module; and an i-th collecting module coupled with an (i?1)-th collecting module, where i is an integer greater than 1 and less than n.

Abstract: Methods for correcting a count loss and PET systems are provided according to examples of the present disclosure. In one aspect, the PET system obtain scanning data of a subject to be detected for which random correction has been performed, obtain a first correction factor corresponding to the true coincidence count according to the single-photon count rates of the two Blocks corresponding to the true coincidence count, obtain a second correction factor corresponding to the true coincidence count according to the system single-photon count rate, and correct the true coincidence count according to the first correction factor and the second correction factor corresponding to the true coincidence count.

Abstract: Methods of generating a gradient signal, gradient signal generators and magnetic resonance imaging systems are provided. In one aspect, a method includes obtaining a target amplitude and a target duration associated with a target precision corresponding to the gradient signal; generating a first actual amplitude by intercepting the target amplitude according to an actual precision of a DAC; generating a second actual amplitude according to the first actual amplitude, wherein a difference between the second actual amplitude and the first actual amplitude is 1; determining a first actual duration of outputting the first actual amplitude and a second actual duration of outputting the second actual amplitude according to the target amplitude, the target duration, the first actual amplitude and the second actual amplitude; controlling the DAC to output the first actual amplitude according to the first actual duration and output the second actual amplitude according to the second actual duration.

Abstract: Methods, systems, and computer-readable storage mediums for image reconstruction are provided. An example of the methods includes obtaining an auxiliary scanning condition, performing an auxiliary scanning using the auxiliary scanning condition to generate an auxiliary image, and in response to a determination to perform a primary scanning based on the auxiliary image, determining a first primary scanning condition using the auxiliary scanning condition and performing the primary scanning using the first primary scanning condition to generate a primary image.

Abstract: A system and method of a PET imaging are provided. According to an example, a detector, a movement control module, a power control module and a reconstructing computer may be connected to a switch in a form of a star-shaped network topology. The detector may include M*N detector units distributed in an annular structure, each detector unit may be allocated with an IP address, M detector units are evenly distributed on each circumferential direction of the annular structure, and N detector units are evenly distributed on each axial direction of the annular structure. Each of the detector units may transmit a set of acquired data to the reconstructing computer through the switch via a network bus; and the set of data may include location information, acquiring time information and IP address.

Abstract: A method for determining a position of an RF coil in a magnetic resonance imaging (MRI) system is disclosed. As an example, a center of a field of view (FOV) to be scanned may be adjusted to a magnetic field center of an MRI system, and coordinate values in a coordinate system for shape-characteristic points of the FOV may be determined, where an origin of the coordinate system is located at the magnetic field center of the MRI system. A preset gradient magnetic field may be applied to the FOV, and coil units respectively covering the shape-characteristic points may be determined. An effective region may be obtained by connecting the determined coil units according to the shape of the FOV, and a coil unit located in the effective region may be determined as an effective coil unit for imaging the FOV by the MRI system.

Abstract: A method for determining a pair of compliance events is provided. A set of event data collected by a PET detector may be divided into N sub-sets, and each of the N sub-sets of event data may be sorted according to an occurrence time of each event included in the event data, wherein N is an integer greater than or equal to 2. A K stage heapsort may be performed on the sorted N sub-sets of event data according to the occurrence time of each event, so as to sequentially output data of each event in the sorting order, wherein K is an integer greater than or equal to 1. A time compliance determination and a space compliance determination may be performed on the sequentially-outputted event data, and a pair of compliance events may be determined if both the time compliance determination and the space compliance determination are passed.