Abstract: The present disclosure relates to a positron emission computed tomography (PET) imaging method, a device, a storage medium, and a product. The method includes: determining a target coincidence event of a to-be-detected object; and performing image reconstruction based on the PET raw data corresponding to the target coincidence event, to obtain a reconstructed image of the to-be-detected object.

Abstract: The present disclosure provides methods and systems for image reconstruction. The methods may include: obtaining background coincidence event data and target coincidence event data, the background coincidence event data being related to a first plurality of background coincidence events, the target coincidence event data being related to a target object; obtaining a target normalization correction factor; correcting the target coincidence event data based on the target normalization correction factor; and generating a target image by performing image reconstruction based on the background coincidence event data and the corrected target coincidence event data.

Abstract: A method for generating a medical data processing network. The method is performed by a medical imaging system, and the method includes: in response to receiving a training instruction, obtaining first medical data, the training instruction being triggered by a user on an application interface of a processing device of the medical imaging system; obtaining a second network by training a first network based on the first medical data, the training including an unsupervised training; generating a test result by inputting second medical data into the second network, the second medical data including a test sample set; determining an evaluation result of a performance of the second network based on the test result; and in response to the evaluation result indicating that the performance of the second network satisfies a requirement, storing a parameter of the second network.

Abstract: A method and a system for PET imaging may be provided. PET data of a subject collected by a PET scan of the subject and a physiological signal relating to a physiological motion of the subject during the PET scan may be obtained. Gated PET images corresponding to physiological phases of the subject may be generated based on the PET data and the physiological signal. Further, for each physiological phase, a first attenuation map of the subject corresponding to the physiological phase may be generated based on the gated PET image corresponding to the physiological phase, and an attenuation corrected gated PET image corresponding to the physiological phase may be generated based on the first attenuation map and a portion of the PET data corresponding to the physiological phase. A target PET image corresponding to a reference physiological phase may be generated based on the attenuation corrected gated PET images.

Abstract: The present disclosure relates to a medical image registration method, a computer apparatus and a storage medium. The method includes: obtaining a similarity weight distribution containing a similarity weight of each element; adjusting, based on the similarity weight of each element, a contribution of a corresponding element in a similarity term of a loss function to the loss function; the similarity weight of the element having a positive correlation relationship with a registration requirement accuracy associated with a region in which the element is located; obtaining, based on an optimized loss function obtained by the adjustment, a target deformation field.

Abstract: The present disclosure provides a PET system and a correction method and system thereof, a device, and a medium. The correction method includes: obtaining an initial NC factor of an initial LOR corresponding to a pair of coincident detector crystals in the PET system; determining, based on the DOI information, a target LOR corresponding to the pair of coincident detector crystals; obtaining a DOI compensating coefficient for the NC factor of the target LOR relative to the initial LOR; and obtaining, based on the initial NC factor and the DOI compensating coefficient for the NC factor, a target NC factor corresponding to the target LOR to correct the PET system.

Abstract: A method and system for myocardial information determination may be provided. Medical images of the heart of a target subject may be obtained. The medical images may be collected by performing a medical scan on the target subject when the target subject is injected with a first tracer. A target model that has been trained using training samples may be obtained. Each training sample includes label information collected using a second tracer. Blood flow information and/or cardiac function information of the heart of the target subject may be determined based on the medical images and the target model.

Abstract: An image registration method, a system, a device, and a medium are provided. The image registration method includes acquiring a to-be-registered image and a reference image of an object, performing registration on the to-be-registered image and the reference image. Either or both of the to-be-registered image and the reference image is a Histoimage with a PET mode.

Abstract: A galactoside compound of Formula (I) is disclosed. The galactoside compound of Formula (I) has the effect of inhibiting galectin-3 by having a structure in which a spiro ring is fused to C1, and appropriate substituents at other carbon positions. Therefore, the galactoside compound and a pharmaceutical composition containing the galactoside compound are effective in the prevention or treatment of diseases or disorders such as galectin-3-related fibrosis and cancer.

Abstract: The present invention introduces a breast milk collection device with a first shell, a second shell, and a membrane. The first shell has a milk suction passage and a milk accumulation chamber with an opening. The second shell is connected to the first shell and has a fixing seat. The membrane includes a negative pressure diaphragm and an annular one-way valve diaphragm connected to its outer edge. The membrane is adjustable, the negative pressure diaphragm tightly seals the milk suction passage, and the one-way valve diaphragm can block the opening. A negative pressure cavity forms between the negative pressure diaphragm and the second shell. The breast milk collection device features a durable, simple, and easily assembled one-way valve for efficient breast milk collection.

Abstract: The disclosure relates to a system and method for medical imaging. The method may include: move, by a motion controller, a phantom to a plurality of phantom positions; acquire, by a scanner of an imaging device, a first set of PET data relating to the phantom at the plurality of phantom positions; reconstructing a PET image at least based on the first set of PET data; acquiring calibration data; and correcting the PET image based on the plurality of phantom positions and the calibration data.

Abstract: A method for attenuation map generation may include obtaining first PET data relating to first background events occur during a first PET scan, which is performed by a PET scanner with no subject within a detection tunnel of the PET scanner; obtaining second PET data relating to second background events occur during a second PET scan, which is performed by the PET scanner with a subject within the detection tunnel; generating, based on the first PET data and the second PET data, a target attenuation map of the subject, wherein the first background events and the second background events may occur when a first particle and a second particle are detected by crystal units of the PET scanner within a background coincident window, and the first particle and the second particle may be different types of particles produced by a radioactive decay of a crystal material of the PET scanner.

Abstract: The present disclosure provides systems and methods for motion correction of a positron emission computed tomography (PET) image. The method may include: obtaining scanned images of a scanned object generated at a plurality of time points; and determining a parametric image by performing a correction processing on the scanned images, wherein the correction processing may be configured to correct an influence of a motion of the scanned object on the scanned images.

Abstract: The present disclosure provides a positron emission tomography (PET) system and an image reconstruction method thereof. The PET system may include a plurality of detector units arranged along an axial direction, each detector unit of the plurality of detector units being configured to generate a plurality of single event counts; a plurality of coincidence logic circuits, each coincidence logic circuit of the plurality of coincidence logic circuits being operably connected to at least one of the plurality of detector units; and a computing system configured to reconstruct an image by performing, based on a plurality of coincidence counts generated by the plurality of coincidence logic circuits, forward projection calculation and backward projection calculation.

Abstract: The present disclosure provides systems and methods for image generation. The methods may include obtaining a first medical image and a second medical image of a target subject. The first medical image may be generated based on first scan data collected using a first imaging modality, and the second medical image may be generated based on second scan data collected using a second imaging modality. The methods may include generating a pseudo-second medical image by transforming the first medical image. The pseudo-second medical image may be a simulated image corresponding to the second imaging modality. The methods may further include determining registration information between the first medical image and the second medical image based on the second medical image and the pseudo-second medical image.

Abstract: A preparation method of a bacterial cellulose-defective molybdenum disulfide (BC-MoS2-x) heterojunction material for treating radioactive wastewater is provided, including: preparing bacterial cellulose by the in situ growth technology of Acetobacter xylinum, and freeze-drying to obtain dried bacterial cellulose; carbonizing the dried bacterial cellulose to obtain carbonized bacterial cellulose; dispersing the carbonized bacterial cellulose into deionized water under an ultrasonic treatment; then adding thiourea and Na2MoO4.2H2O, dissolving under an ultrasonic treatment to obtain a reaction mixture, subjecting the reaction mixture to a hydrothermal reaction to obtain a BC-MoS2 heterojunction; and calcining the BC-MoS2 heterojunction in a tube furnace with an Ar/H2 atmosphere to obtain the BC-MoS2-x heterojunction.

Abstract: The present disclosure provides a positron emission tomography (PET) system and an image reconstruction method thereof. The PET system may include a plurality of annular detector units arranged along an axial direction. Each of the detector units may generate a plurality of single event counts. The PET system may further include a plurality of coincidence logic circuits connected to one or more of the detector units. The coincidence logic circuits may be configured to count coincidence events. Single event data generated by each of the detector units may be transmitted to the corresponding coincidence logic circuit. The plurality of coincidence logic circuits may synchronically generate coincidence counts relating to the plurality of detector units.

Abstract: This document describes methods and systems for training a machine learning model to segment digital breast images into key regions of interest, and also for using the model on a new digital breast image to assess whether the breast image exhibits adequate image quality, report the image quality, and/or to use these data to reconstruct or process the new breast image.

Abstract: The present disclosure provides a system and method for PET image reconstruction. The method may include processes for obtaining physiological information and/or rigid motion information. The image reconstruction may be performed based on the physiological information and/or rigid motion information.

Abstract: A method of creating an interactive emoticon includes receiving a selected basic emoticon, receiving input user text, displaying a preview of an interactive emoticon to be transmitted based on the selected basic emoticon and the input user text, and forming the interactive emoticon based on the selected basic emoticon and the input user text, wherein the displaying of a preview of an interactive emoticon includes performing a font size change or a line break based on a number of characters of the input user text.