Systems and methods for correcting positron emission tomography devices

A system for correcting a positron emission tomography (PET) device, comprising:

• at least one storage device including a set of instructions;
• and
• at least one processor configured to communicate with the at least one storage device, wherein when executing the set of instructions, the at least one processor is configured to direct the system to perform operations including:
• obtaining data associated with coincidence events related to intrinsic background radiations of a plurality of crystals of the PET device, wherein each of the coincidence events is detected by two crystals of the plurality of crystals of the PET device, and the data associated with each coincidence event includes first time information and second time information;
• determining a first time of flight (TOF) difference corresponding to the each coincidence event based on the first time information and the second time information;
• determining a second TOF difference corresponding to the each coincidence event based on locations of the two crystals that detect the each coincidence event;
• correcting the PET device based on the first TOF difference and the second TOF difference;
• generating a reference energy spectrum based on energy information of the each coincidence event;
• determining a reference peak position in the reference energy spectrum;
• determining a target peak position based on the reference peak position in the reference energy spectrum;
• and
• correcting the PET device based on the target peak position and a corrected peak position.

A method for correcting a positron emission tomography (PET) device, which is implemented on a computing device including at least one processor and at least one storage device, comprising:

• obtaining data associated with coincidence events related to intrinsic background radiations of a plurality of crystals of the PET device, wherein each of the coincidence events is detected by two crystals of the plurality of crystals of the PET device, and the data associated with each coincidence event includes first time information and second time information;
• determining a first time of flight (TOF) difference corresponding to the each coincidence event based on the first time information and the second time information;
• performing a time walk effect correction and/or a position correction on the first TOF difference;
• determining a second TOF difference corresponding to the each coincidence event based on locations of the two crystals that detect the each coincidence event;
• and
• correcting the PET device based on the first TOF difference and the second TOF difference.