Crystal bar position look-up table generation method and device

Abstract

The invention provides a crystal bar position look-up table generation method and device based on a local extremum relocation PET detector. The crystal bar position look-up table generation method is characterize by, to begin with, carrying out statistics on detected photon events to obtain a two-dimension position spectrum; then, obtaining rapid estimation of center positions of crystal bars with arrangement rules of a crystal cell array in actual space being constraint and through performing peak searching operation on projection data of the position spectrum; and at last, taking effective data fragments out of the position spectrum according to the estimation values of the center positions and performing local peak relocation on the effective data fragments to obtain accurate center positions of the crystal bars, and finishing boundary division based on the accurate center positions, and thus a crystal position look-up table is generated. The invention also discloses a PET detector crystal position rapid identification apparatus which comprises a position statistics and preprocessing module, a crystal center position calculating module and a look-up table writing back module. According to the crystal bar position look-up table generation method and device, the crystal position look-up table can be generated online rapidly and effectively, thereby providing accurate and reliable crystal unit position information for follow-up processing.

Description

technical field [0001] The invention relates to the field of radiation detection, in particular to a method and device for generating a crystal strip position look-up table for a positron emission tomography imaging system. Background technique [0002] Positron Emission Tomography (PET) is a non-invasive imaging method. The current mainstream PET detectors usually adopt the design method of scintillation crystal strip array coupled photoelectric conversion devices. For the detector with this design structure, the crystal is first cut into small crystal strips, and then the crystal strips are formed into a crystal array to form a module, and then coupled with a photoelectric conversion device. When gamma photons are incident on a scintillation crystal strip, they interact to generate energy deposition and generate visible light signals. The photomultiplier tube receives these light signals and converts them into corresponding electrical signal outputs. Using this electrical...

AI Technical Summary

Problems solved by technology

[0005] Although literature 5 [5] realizes the online generation of the crystal position lookup table, it takes a long time to obtain a relatively accurate crystal position lookup table due to the neural network implementation method.

Moreover, in the case of a lot of noise, it will affect the processing results of the method

In addition, the high complexity of engineering implementation and high resource consumption are also defects in this method

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