The present disclosure is related to systems and methods for reconstructing a positron emission tomography (PET) image. The method includes obtaining PET data of a subject. The PET data may correspond to a plurality of voxels in a reconstructed image domain. The method includes obtaining a motion signal of the subject. The method includes obtaining motion amplitude data. The motion amplitude data may indicate a motion range for each voxel of the plurality of voxels. The method includes determining gating data based at least in part on the motion amplitude data. The gating data may include useful percentage counts each of which corresponds to at least one voxel of the plurality of voxels. The method includes gating the PET data based on the gating data and the motion signal. The method includes reconstructing a PET image of the subject based on the gated PET data.

Systems and methods to estimate 3D TOF scatter include acquisition of 3D TOF data, determination of 2D TOF data from the first TOF data, determination of first estimated scatter based on the second TOF data, reconstruction of a first estimated image based on the first estimated scatter and the second TOF data, determination of attenuated unscattered true coincidences based on the first estimated image, determination of second estimated scatter based on the first TOF data and the attenuated unscattered true coincidences, and reconstruction of an image of the object based on the first TOF data and the second estimated scatter.

Systems and methods to estimated mean randoms include acquisition of list mode data describing true coincidences and delay coincidences detected by a positron emission tomography scanner during a scan of an object, determination, for each crystal of the positron emission tomography scanner and for each of a plurality of time periods of the scan, of delay coincidences including the crystal based on the list mode data, determination, each crystal, of determine a singles rate associated with each time period based on the delay coincidences determined for the crystal over the time period, determination, for each time period, of determine estimated mean randoms for each of a plurality of pairs of the crystals based on the singles rate associated with the time period for each crystal of the crystal pair, and reconstruction of an image of the object based on the estimated mean randoms for each time period and the detected true coincidences.

One embodiment provides a method for three-dimensional imaging by determining distances of objects within scenes, the method including: emitting a light onto an object within a scene for a predetermined length of time; receiving a plurality of reflections of the light from the object, wherein each of the plurality of reflections is received for a predetermined length of time less than an exposure time for a frame of the scene, wherein the photon detector generates an electrical signal; determining depth location information of at least a portion of the object within the scene corresponding to the given of the electrical signals; and generating, from the depth location information of portions of the object within the scene, a three-dimensional image for the frame of the scene.

A signal sampling method comprising: sampling an electrical signal to be measured using a pre-determined sampling method to obtain a plurality of first sampling points, each of which is represented by a first amplitude and a corresponding first time; measuring a second amplitude of the electrical signal to be measured, wherein the second amplitude is different from the plurality of the first amplitudes; and delaying the electrical signal to be measured, and using the delayed electrical signal to determine a second time when the amplitude of the electrical signal to be measured reaches the second amplitude in order to obtain a second sampling point, which is represented by the second amplitude and the second time. A greater number of sampling points can be sampled, such that the precision of sampling and also the accuracy of subsequent signal restoration may be improved.

Embodiments of the present invention provide a phantom and radiation detection system (100) comprising a vessel for containing a tissue equivalent liquid and adapted to pass a beam of test radiation into the vessel (110), a detector (140) adapted to determine the intensity of the beam of test radiation, the detector (140) being supported within the vessel (110) and movable therein along an expected path of the beam of test radiation, wherein the detector (140) is a 2-dimensional detector adapted to determine the spatial intensity and energy deposition of the beam.

Embodiments of the present invention provide a phantom and radiation detection system (100) comprising a vessel for containing a tissue equivalent liquid and adapted to pass a beam of test radiation into the vessel (110), a detector (140) adapted to determine the intensity of the beam of test radiation, the detector (140) being supported within the vessel (110) and movable therein along an expected path of the beam of test radiation, wherein the detector (140) is a 2-dimensional detector adapted to determine the spatial intensity and energy deposition of the beam.

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 potion 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.

A device for imaging radiation source in a decommissioning area of a nuclear power plant includes a detecting unit including a plurality of pixels for detecting an X-ray spectrum generated from a decommissioning area of a nuclear power plant, a processing unit connected to the detecting unit and configured to analyze the X-ray spectrum detected from the plurality of pixels and fuse a first element image displaying first pixels from which a first characteristic X-ray energy of a first element, among the plurality of pixels, is detected and a second element image displaying second pixels from which a second characteristic X-ray energy of a second element, among the plurality of pixels, is detected, into a fused image, and a display unit connected to the processing unit and configured to display the fused image corresponding to the decommissioning area.

Provided is a system for monitoring radiation based on a monitoring post, the system implemented to perform aerial radiation measurement for the altitude in the vertical direction based on the location in which monitoring posts are installed, thereby efficiently predicting the movement path and the contaminated area of radioactive materials, and efficiently distinguishing radioactive leakage from the ground surface and radioactive materials that float and move from the outside.