64 results about "Pet detector" patented technology

The invention discloses a PET system scanning method, device and equipment and a PET system.The system comprises a PET detector ring with the variable aperture, and the method comprises the steps that the target aperture of the detector ring is determined according to a target scanning part; determining a target calibration file and a target reconstruction strategy according to the target aperture of the detector ring, and controlling the aperture of the detector ring to be adjusted to the target aperture; scanning the target scanning part based on the detector ring of the target aperture and the target calibration file and carrying out data acquisition; and reconstructing an image according to the target calibration file, the target reconstruction strategy and the PET original data. According to the scheme disclosed by the invention, the aperture of the detector ring is adjusted to be the target aperture matched with the target scanning part, scanning and data acquisition are carried out based on the target aperture and the calibration file matched with the target aperture, and imaging is reconstructed based on the calibration file matched with the target aperture and the reconstruction strategy. Therefore, the PET system can be better suitable for scanning of different parts, and the image quality is improved.

The invention discloses a PET detector signal simulation generation method based on artificial intelligence, and the method comprises the steps: generating an initial two-photon signal pair which meets the physical constraints of initial energy and time difference through a two-photon signal generator which fuses Transform and U-Net; decoupling the mixed noise into a plurality of independent physical noise components according to a PET noise physical priori library by using a multi-branch decoupling network based on an attention mechanism, and outputting a pure signal and a noise component map; performing linkage adjustment on the pure signal and the noise component according to a target parameter set by a user through a space-time-noise cooperative regulator; and finally, a customized signal data format is adaptively output according to the downstream task type. According to the method, high-fidelity, interpretable and adjustable coincidence event-level signal simulation is realized, the core problems of complex modeling, noise distortion, lack of relevance and poor scene adaptability of a traditional method are effectively solved, and the efficiency and precision of PET detector research, development and test are remarkably improved.

Disclosed herein are methods and apparatus for acquiring positron emission (or PET) data in the presence of ionizing radiation causing PET detector afterglow. In one variation, the method includes adjusting a coincidence trigger threshold of a PET detector during a treatment session. In one variation, the method includes adjusting a gain factor used in positron emission data acquisition (e.g., a gain factor used to multiply and / or shift an output(s) of a PET detector(s)) during a treatment session. In some variations, a method for acquiring positron emission data during a radiation treatment session includes suspending communication between a PET detector and a signal processor of a controller for a predetermined period of time after a radiation pulse is emitted by a linear accelerator.

The invention discloses a PET detector and a front-end circuit thereof, a scanner and PET-MR equipment, the PET detector comprises a plurality of groups of SiPM arrays, cathodes of the plurality of groups of SiPM arrays are connected, the front-end circuit comprises a first arithmetic unit, the first arithmetic unit is suitable for being connected with the cathodes of each group of SiPM arrays, and the first arithmetic unit is suitable for being connected with the cathodes of the plurality of groups of SiPM arrays; the trigger module is configured to determine trigger time information and energy information according to a total current signal of the multiple groups of SiPM arrays; the second arithmetic unit is configured to determine y-axis coordinate information according to the first anode current of the first target SiPM array and the second anode current of the second target SiPM array; the third arithmetic unit is configured to determine x-axis coordinate information according to the third anode current of the third target SiPM array and the fourth anode current of the fourth target SiPM array; and the data processing unit is configured to determine a crystal position code according to the energy information, the y-axis coordinate information and the x-axis coordinate information. The size of the front-end circuit is small, so that the structural size of the PET detector is reduced, and the effective aperture of the MR scanner is kept.

This application provides a PET detector and a method for analyzing the yellowing of optical adhesives. It relates to the field of optical technology. A light emitting module outputs light sources of at least two wavelengths, including a reference light source. A light receiving module includes light receiving devices configured for each light source, used to receive the light signals from the corresponding light sources and convert the light signals into a first electrical signal. A processing module controls the alternating illumination of different light sources in the light emitting module and collects the first electrical signal output by the light receiving module to determine the first optical parameters of the optical adhesive under the illumination of each light source. Based on the first and second optical parameters, the yellowing value of the optical adhesive is determined. The second optical parameter is determined when the optical adhesive is not in use, based on the first electrical signal collected from the optical adhesive under the illumination of each light source. This allows for real-time and reliable analysis of the yellowing degree of the optical adhesive, ensuring the reliability of the equipment operation.

The invention provides a DNN-based multiplexing PET detector event positioning method and system and a medium, and the method comprises the following steps: simulating and obtaining the spatial characteristics and statistical characteristics of inter-crystal scattering events in a PET detector, and dividing CP events into adjacent CP events and long-distance CP events; generating a training data set in combination with an optical simulation and analysis method, wherein the training data set comprises optical distribution data of CP events and optical distribution data of P events; constructing a multiplexing DNN model, training the multiplexing DNN model by using the data set, inputting optical distribution data to be processed into the trained multiplexing DNN model, and completing event classification; according to different event types, a first interaction crystal is selected, and high-precision event positioning is realized through crystal scattering identification.

The application provides a time correction method and system for inter-crystal scattering events of a PET detector based on SiPM, and the application instantiates multiple time-to-digital converters in a field programmable logic gate array device, performs pulse width measurement on the electrical signals output by each SiPM detector, since the pulse width is positively correlated with the energy of the signal, the non-inter-crystal scattering events and the inter-crystal scattering events can be determined by the pulse width, and the position of the inter-crystal scattering events is determined to reduce the position selection error. During the correction, firstly, the non-inter-crystal scattering events are generally corrected, then further, the time difference between the inter-crystal scattering events occurring in each crystal and the non-inter-crystal scattering events on the response line is counted offline, the additional time difference of each inter-crystal scattering event caused by the time walk effect is obtained, and then the inter-crystal scattering events are secondarily corrected in time online, so that the time resolution of the system is improved.

The application provides a PET detector. The PET detector comprises: a crystal array comprising a plurality of crystal units arranged in a single layer, the crystal units extending in a top-bottom direction and having a top surface, a bottom surface and a side surface between the top surface and the bottom surface; a light reflection film arranged on a surface of at least one crystal unit in the plurality of crystal units; and a semiconductor sensor array comprising a plurality of semiconductor sensors, only part of the crystal units in the crystal array being coupled with the semiconductor sensors, the number of the crystal units in the crystal array being greater than the number of the semiconductor sensors in the semiconductor sensor array. By arranging a light splitting structure on the crystal units, the transmission distance of photons can be effectively shortened relative to arranging a light guide sheet between the crystal array and the semiconductor sensors, and thus the light transmission loss caused by the light guide sheet can be avoided, so that the resolution of the PET detector can be improved.

The application relates to the field of positron emission tomography technology, in particular to a multi-channel high-precision PET circuit acquisition system and a use method thereof, and the system comprises the following: an FPGA control board, which is used for controlling bias voltage programming output voltage values, controlling current programming output voltage values and current values according to DAC bias voltage values received from an upper computer, and sending DUT board configuration information received from the upper computer to a DUT board; and the DUT board, which comprises multi-channel high-precision PET circuits, each circuit is configured through an SPI protocol according to DUT board configuration information received from the upper computer, 16 channels are adopted to collect time electric signal information output by a PET detector, and 64 channels are adopted to collect energy electric signal information output by the PET detector. In the application, the multi-channel high-precision PET circuit acquisition software and the hardware of the control system are portable, the upper computer software program is programmable, and the operation is simple.

The invention provides a PET detector and an optical glue yellowing analysis method. Relates to the technical field of optics. A light emitting module outputs light sources with at least two wavelengths, and the light sources with the at least two wavelengths comprise reference light sources; the light receiving module comprises light receiving devices configured corresponding to the light sources and is used for receiving light signals of the corresponding light sources and converting the light signals into first electric signals; the processing module is used for controlling the different light sources in the light emitting module to be alternately lightened, collecting the first electric signal output by the light receiving module and determining a first optical parameter corresponding to the optical glue under the irradiation of each light source; determining a yellowing value of the optical glue based on the first optical parameter and the second optical parameter; the second optical parameter is an optical parameter determined according to a first electric signal acquired when the optical glue is irradiated by each light source under the condition that the optical glue is not put into use. Therefore, the yellowing degree of the optical glue can be reliably analyzed in real time, and the reliability of equipment operation is ensured.

The invention relates to a scanning system and a scanning equipment control method, the scanning system comprises a control device, first scanning equipment and second scanning equipment, the first scanning equipment comprises an X-ray generator, and the second scanning equipment comprises a PET detector; wherein when the exposure signal generated by the first scanning device is not smaller than a preset value, the detection range of the PET detector contains X-rays generated by the X-ray generator; and the control device is used for responding to the exposure signal and controlling the disconnection of the circuit between the PET detector and the power supply. By adopting the scanning system, the power-off stability of the PET detector can be improved.

The present application discloses a PET detector monitoring method, apparatus, storage medium, and electronic device, wherein the method includes: setting an energy collection range of a target energy window based on target radiation emitted by a target component in a target detector, or target radiation emitted by a natural radioactive background; determining target response data based on the target radiation; based on the energy collection range of the target energy window, using each detector unit in a target PET detector to collect energy from the target radiation in real time, obtaining response data corresponding to each detector unit; and monitoring each detector unit based on the target response data and the response data of each detector unit to obtain monitoring results. The monitoring method of the present application does not require an additional radiation source, making monitoring of the PET detector more convenient and faster.

The application relates to a PET detector readout depth acquisition method, a PET image acquisition method, a computer device, a storage medium and a computer program product, which can improve the calibration operability of a detector crystal. The method comprises the following steps: scanning a scanning object in a field of view to obtain scanning data corresponding to the scanning object and received by a coincidence detector crystal; at least one of the coincidence detector crystals is divided into multiple layers, and each layer corresponds to a DOI readout depth; for each layer of the coincidence detector, image reconstruction is performed according to the scanning data received by the layer to determine a reconstruction effect; the reconstruction effect is related to the starting depth of the coincidence response line of the layer; based on the reconstruction effects of the scanning object, the starting depth of the coincidence response line is adjusted until the reconstruction effects of the scanning object in the reconstruction images match; and the DOI readout depth of each layer is obtained according to the current starting depth of the coincidence response line of each layer of the coincidence detector crystal.

The invention provides a detection method and device of a dual-channel PET detector and medical imaging equipment. The detection method of the dual-channel PET detector comprises the following steps: acquiring first detection energy and first detection depth of incident light; according to the first detection energy, the current temperature and a first fitting relation, the actual energy of the incident light is determined, and the first fitting relation represents the mapping relation between the energy gain and the temperature; according to the first detection depth, the current temperature and a second fitting relation, the actual depth of the incident light is determined, and the second fitting relation represents the mapping relation between the detection depth and the temperature. Through the detection method, the correction workload can be reduced, and the detection accuracy of the PET detector can be improved.

The disclosure relates to a device and positron emission tomography (PET) scanner for acquiring a PET image and a system for generating the PET image. The disclosure describes a device that may have one or more moveable portions. The device may comprise an upper portion and a lower portion. The upper portion and lower portion define a cavity for a patient. At least one of the upper portion or the lower portion may be movable. The upper and lower portions may comprise a cap and wings, respectively, At least one of the caps and / or wings may comprise one or more detection modules. The wings may also move with respect to a corresponding cap.

This invention discloses a polyhedral brain PET detector with adjustment function, belonging to the field of medical testing equipment technology. It includes an external support structure, a detection structure, semi-annular pads, and an adjustment module. The detection structure is installed within the external support structure. The detection structure includes a top mounting plate, detection module one, detection module two, detection module three, and a structural assembly frame. Multiple sets of detection modules one, two, and three are installed between the top mounting plate and the structural assembly frame. The top mounting plate, structural assembly frame, detection modules one, two, and three are distributed in a large rhomboid semi-cube shape. Two semi-annular pads are symmetrically installed on the lower side of the external support structure, forming a neck limiter between them. An adjustment structure is installed on the upper side of the external support structure. Through this method, while allowing for a certain degree of deformation adjustment and improving the user's head geometric fit, the peripheral field of vision is effectively reduced.

The invention provides a temperature self-regulation PET detector device which comprises a submodule assembly, the submodule assembly comprises a base, a support and a submodule carrier plate fixed to the base through the support, and the submodule carrier plate is connected with a bimetallic strip structure; the cold plate assembly is in contact with the sub-module carrier plate through the bimetallic strip structure, when the temperature of the sub-module carrier plate rises, the contact area of the bimetallic strip structure and the cold plate assembly is increased, and when the temperature of the sub-module carrier plate drops, the contact area of the bimetallic strip structure and the cold plate assembly is reduced. According to the invention, the temperature between the PET detectors and the temperature between the sub-modules in the detectors can be stabilized in a certain temperature range, and the temperature difference is reduced, so that the image quality of the PET detectors is improved.

The invention discloses a particle detection device and a manufacturing method thereof. The particle detection device includes: a scintillator array including a plurality of scintillator crystals; a plurality of detectors disposed at a first end of the scintillator array; and the plurality of quasi cylinders are arranged at the second end of the scintillator array. A pseudo-cylinder of the plurality of pseudo-cylinders is disposed as a particle that is redirected between the second ends of the crystals of the scintillator array. A first end of a first set of crystals of the scintillator array is disposed to direct particles to a first detector of the plurality of detectors, and a first end of a second set of crystals of the scintillator array is disposed to direct particles to a second detector substantially adjacent to the first detector.

A PET detector and method thereof are provided. The PET detector may include: a crystal array including a plurality of crystal elements arranged in an array and light-splitting structures set on surfaces of the plurality of crystal elements, the light-splitting structures jointly define a light output surface of the crystal array; a semiconductor sensor array, which is set in opposite to the light output surface of the crystal array and is suitable to receive photons from the light output surface, the semiconductor sensor array comprises a plurality of semiconductor sensors arranged in an array.

This invention relates to the field of positron emission tomography (PET) imaging technology, specifically to a PET detector imaging system and its application. The system includes a shield, a scintillation crystal LYSO array, a silicon photomultiplier tube (SiPM) array, a PET circuit array, an FPGA main control board, a level conversion module, a CameraLink protocol conversion module, and a PC host computer. This invention constructs a model of a large-scale PET detector imaging system, using a high-precision multi-channel PET circuit as the core component. The PET detector (shield + scintillation crystal LYSO array + silicon photomultiplier tube (SiPM) array) is modular. Pulse time window coincidence detection technology is used to encode the accurate location of annihilation, and the acquired energy information is converted and transmitted using the CameraLink protocol. This imaging system is scalable, fully domestically produced, and highly sensitive, and can be effectively applied to ring-type PET detectors in the nuclear medicine field, providing another implementation method and path for large-scale medical diagnostic imaging technology.

An imaging apparatus for imaging ex-vivo tissue specimens includes a positron emission tomography imaging module having at least one pair of PET detectors; a computed tomography imaging module including an X-ray source and an X-ray detector; a tissue specimen receiving element configured to receive the tissue specimen to be imaged.

The application discloses a PET detector signal simulation generation method based on artificial intelligence, comprising the following steps: generating an initial two-photon signal pair meeting initial energy and time difference physical constraints through a two-photon signal generator fusing a Transformer and a U-Net; decoupling mixed noise into multiple independent physical noise components according to a PET noise physical prior library by using a multi-branch decoupling network based on an attention mechanism, and outputting a pure signal and a noise component spectrum; performing linkage adjustment on the pure signal and the noise component according to target parameters set by a user through a space-time-noise collaborative regulator; and finally, outputting a customized signal data format according to a downstream task type. The application realizes high-fidelity, interpretable and controllable coincidence event level signal simulation, effectively solves the core problems of complex modeling, noise distortion, lack of correlation and poor scene adaptability of traditional methods, and significantly improves the efficiency and accuracy of PET detector research and testing.

The present application is applicable to the field of scanning imaging technology, and provides a method and device for automatically calibrating the DOI of a dual-ended PET detector. The method includes: collecting energy data through the dual-ended PET detector, determining the distribution relationship between the DOI ratio and the number of gamma events based on the energy data to obtain a DOI curve, performing equal-area segmentation processing on the DOI curve to obtain multiple DOI boundary values, thereby calibrating the DOI scale table, and when a gamma event is detected, looking up the DOI corresponding to the gamma event through the DOI scale table. The present application realizes that when a gamma event is detected, the corresponding DOI can be automatically found through the DOI scale table, and at the same time, automatic calibration for DOI curves of different shapes can be achieved, with a small amount of calculation, improving the calibration accuracy and efficiency.

Provided is a particle detection device and method of fabrication thereof. The particle detection device includes a scintillator array that includes a plurality of scintillator crystals; a plurality of detectors provided on a bottom end of the scintillator array; and a plurality of prismatoids provided on a top end of the scintillator array. Prismatoids of the plurality of prismatoids are configured to redirect particles between top ends of crystals of the scintillator array. Bottom ends of a first group of crystals of the scintillator array are configured to direct particles to a first detector of the plurality of detectors and bottom ends of a second group of crystals of the scintillator array are configured to direct particles to a second detector substantially adjacent to the first detector.

The invention provides a high-resolution depth coding PET detector device, and the device comprises a SiPM pixel module which comprises a SiPM pixel array; the scintillation crystal module comprises a scintillation crystal array, and the SiPM pixel array is optically coupled with the scintillation crystal array; the prismoid light guide module comprises a prismoid light guide array, the prismoid light guide array is optically coupled with the scintillation crystal array, the spatial resolution and DOI resolution of the PET detector module are remarkably improved, meanwhile, good energy resolution and timing resolution are kept, and commercialized popularization is facilitated.

The application discloses a PET detector testing method and device, electronic equipment and a storage medium. The method comprises the following steps: collecting a first dark current signal of a photomultiplier tube cluster of a PET detector, and determining a first state of the photomultiplier tube cluster according to the first dark current signal; or collecting a second dark current signal of a silicon photomultiplier of the PET detector, and determining a second state of the silicon photomultiplier according to the second dark current signal; collecting at least one group of coincidence signals of a detector ring of the PET detector, and determining a third state of a coincidence signal link according to the coincidence signals; and determining a test result of the PET detector by combining any one of the first state and the second state and the third state. The application realizes daily quality inspection testing of the PET detector by computer means without a radioactive source, that is, without a rod source system, and has high testing precision and is convenient to use.

The invention relates to the technical field of nuclear radiation detectors and positron emission tomography (PET) imaging, and discloses a PET detector, a depth positioning method based on the PET detector and a storage medium. The PET detector is composed of a photoelectric detection element array, a crystal array composed of N * M scintillation crystals, a reflecting material and a transparent optical material. The crystal array includes a first end and a second end, and at least one of N and M is greater than 1, at least one of N and M is an odd number, and the first end is coupled to the array of photodetection elements. A reflective material and a transparent optical material are added in gaps between the plurality of scintillation crystals of the crystal array so as to divide the first end into a plurality of first regions to form a first shared optical path and divide the second end into a plurality of second regions to form a second shared optical path. A target first region of the plurality of first regions and a target second region of the plurality of second regions each include a central crystal in the crystal array. And the multiplexing of the scintillation photons is realized through the shared light path.

A Positron Emission Tomography (PET) detector includes a sensor. The sensor includes a photodetector array, an anode summing circuit, a cathode summing circuit, and a processor. The photodetector array has a plurality of photodetectors arranged in a two-dimensional grid having rows and columns, each photodetector configured to generate an anode signal and a cathode signal in response to an event at the photodetector. The anode summing circuit is configured to determine a sum of anode currents generated by photodetectors within a column of the photodetector array. The cathode summing circuit is configured to determine a sum of cathode currents generated by photodetectors within a row of the photodetector array. The processor is configured to determine parameters of the event based on at least one of the sum of anode currents and the sum of cathode currents.

The application relates to a PET detector dead time correction method, a system and a PET system. The method comprises the following steps: adding a preset trigger signal to an input signal of a PET detector; determining a delay coincidence event of the trigger signal in an output signal of the PET detector; determining a dead time correction factor of the PET detector according to the number of events of the delay coincidence event; and performing dead time correction on the PET detector according to the dead time correction factor. The method can reduce the dead time correction error of the PET detector.

The invention discloses an integrated imaging device and method, and the device comprises a PET detection assembly and an SPECT detection assembly which respectively comprise a plurality of PET detectors and a plurality of SPECT detectors. The PET detection assembly and the SPECT detection assembly both have an initial state and a use state, when the PET detection assembly and the SPECT detection assembly are both in the initial state, the PET detector and the SPECT detector are arranged according to a preset rule, and only one of the PET detection assembly and the SPECT detection assembly is in the use state at the same detection moment. According to the invention, the integration level of the equipment can be improved, multiple purposes can be met, and the use efficiency of the equipment can be improved.