Method and apparatus for positron emission tomography

A PET system, comprising:

• a detector configured to receive radiation rays, the detector comprising a detecting module, the detecting module comprising:
• a scintillator array configured to receive a radiation ray and generate optical signals in response to the received radiation ray, the scintillator array having a plurality of rows of scintillators arranged in a first direction and a plurality of columns of scintillators arranged in a second direction, the second direction being approximately orthogonal to the first direction;
• a first group of light guides arranged on a top surface of the scintillator array;
• and
• a second group of light guides arranged on a bottom surface of the scintillator array;
• and
• at least one processor configured to cause the PET system to:
• determine an intensity of an output from the first group of light guides according to the optical signals;
• determine an intensity of an output from the second group of light guides according to the optical signals;
• and
• identify, within the scintillator array, a scintillator that has interaction with the received radiation ray based on an intensity of the output from the first group of light guides and an intensity of the output from the second group of light guides.

A method implemented on a computing device, the computing device including at least one processor, the method comprising:

• determining, by the at least one processor, an intensity of an output from a first group of light guides of a scintillator array according to optical signals generated by the scintillator in response to a received radiation ray, the first group of light guides arranged on a top surface of the scintillator array along a first direction, the scintillator array having a plurality of rows of scintillators arranged in the first direction, a plurality of columns of scintillators arranged in a second direction, the second direction being approximately orthogonal to the first direction;
• determining, by the at least one processor, an intensity of an output from a second group of light guides of the scintillator array according to the optical signals, the second group of light guides being arranged on a bottom surface of the scintillator array along the second direction;
• and
• identifying, by the at least one processor, within the scintillator array, a scintillator that has interaction with the received radiation ray based on the intensity of the output from the first group of light guides and the intensity of the output from the second group of light guides, wherein
• a light guide count of the first group of light guides is less than a row count of the plurality of rows of scintillators, a light guide count of the second group of light guides is less than a column count of the plurality of columns of scintillators.