Online real-time correction method and system for positron emission tomography detector

An on-line real-time correction system for a positron emission tomography (PET) detector, comprising:

• at least a processor;
• and
• at least a computer readable storage medium containing instructions of programs executed by the processor, wherein the instructions comprises:
• a first acquisition module, a second acquisition module, a calculation module and an adjustment module, wherein the first acquisition module is configured to acquire a drifted channel number of a peak position of a full-energy peak which is generated by self-decay of a scintillator containing a radioactive isotope in a PET detector system, in a drifted energy spectrum diagram after a gain value of the PET detector system has changed, i.e., a current total peak position of a module;
• the second acquisition module is configured to acquire a ratio of a currently accumulated energy of each signal channel to a total currently accumulated energy of all signal channels in the PET detector system, i.e., a proportion of a current energy of each signal channel to a total energy, after the gain value of the PET detector system has changed;
• the calculation module is configured to substitute the current total peak position of the module, the proportion of the current energy of each signal channel to the total energy and a target total peak position of the module, and a proportion of a target energy of each signal channel to the total energy into the following formula to calculate a gain adjustment ratio of each signal channel:
• A
• ⁢
• (
• x
• )
• =
• Pref
• *
• Gref
• ⁡
• (
• x
• )
• Pcur
• *
• Gcur
• ⁡
• (
• x
• )
• ,
• wherein, x represents a signal channel number which is an integer from 1 to N, and N is a total signal channel number in the PET detector system;
• A(x) is a gain adjustment ratio of a signal channel x;
• Pref is a target total peak position of the module;
• Gref(x) is a proportion of the target energy of the signal channel x to the total energy;
• Pcur is a current total peak position of the module;
• Gcur(x) is a proportion of the current energy of the signal channel x to the total energy;
• the target total peak position of the module is an initial channel number of a peak position of a full-energy peak which is generated by self-decay of the scintillator containing the radioactive isotope in the PET detector system, in an initial energy spectrum diagram;
• the proportion of the target energy of each signal channel to the total energy is a ratio of an initially accumulated energy of each signal channel to a total initially accumulated energy of all of the signal channels in the PET detector system;
• and
• the adjustment module is configured to, perform gain adjustment for each signal channel respectively according to the gain adjustment ratio of each signal channel.