Shenyang Neusoft Medical Systems Co., Ltd.

Shanghai Neusoft Medical Technology Co., Ltd.

Jie Chang

Ming Li

Shaolian Liu

Zhipeng Sun

Methods, devices and systems for correcting a count loss in a Position Emission Computed Tomography (PET) system are provided. In one aspect, a method includes: constructing a virtual system including a plurality of virtual crystals, determining, for each of virtual Lines of Response (LORs) in the virtual system, a plurality of real LORs corresponding to the virtual LOR in the PET system, each of the real LORs corresponding to a scanning state of the PET system with a continuous incremental scanning mode, determining a count loss correction factor of the corresponding real LOR in each of the scanning states, determining a count loss correction factor of the virtual LOR according to the determined count loss correction factors of the plurality of real LORs corresponding to the virtual LOR, and performing count loss correction for the virtual LOR according to the determined count loss correction factor of the virtual LOR.

Correcting count loss in pet system

Methods, devices and apparatus for reconstructing an image are provided. In an aspect, a method includes: obtaining coincidence events detected by crystal pairs in a detector of a PET device by scanning a phantom, reconstructing a phantom image according to the coincidence events, and obtaining a time calibration amount of each of crystals in the detector by determining a crystal based source position deviation and a crystal based source time difference of a crystal pair including the crystal according to the phantom image, determining a time difference of the crystal pair according to respective time differences for the crystal pair detecting a plurality of coincidence events, pre-calibrating the time difference of the crystal pair with the crystal based source time difference, and obtaining the time calibration amount of the crystal according to the pre-calibrated time difference of the crystal pair.

Reconstructing image

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.

Correcting count loss

Methods, systems, and machine-readable storage mediums for reconstructing a PET image are provided. In one aspect, a method includes: determining a plurality of LORs associated with multiple-coincidence data in coincidence data detected by a PET device through scanning, obtaining a respective line integral value along each of the LORs according to a time difference between two single events corresponding to the LOR, allocating the multiple-coincidence data to the LORs according to the respective line integral values of the LORs to obtain respective multiple allocation data on the LORs, correcting respective double-coincidence data in the coincidence data corresponding to each of the LORs based on the respective multiple allocation data on the LOR to obtain data of the LOR, and reconstructing an image according to the data of each of the LORs.

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Shenyang, China

Jie Chang