Counts correcting method and device for PET detector

Abstract

The invention relates to the field of processing of images, and in particular relates to a counts correcting method for a PET detector. The method comprises the steps of acquiring correction events and acquiring the position information corresponding to reach correction event; acquiring the counts information of each counting area of the PET detector according to the position information corresponding to the correction event; acquiring correction coefficients corresponding to each counting area according to the counting information of each counting area; dividing the PET detector into a plurality of counting areas, wherein the quantity of the counting areas is corresponding to that of a photoelectric multiplying pipe channels of the PET detector; determining whether the correction coefficients of the counting areas are within the preset threshold range; if so, stopping correcting the counts of the PET detector; if not so, adjusting an output signal of the PET detector according to the correction coefficients corresponding to each counting area until the correction coefficients of reach counting area are within the preset threshold range. With the adoption of the method, the counts uniformity can be improved, the imaging uniformity of an image can be improved, and therefore, the high-quality image can be obtained.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and device for counting and correcting a PET detector. Background technique [0002] At present, PET-CT (full name in English is Positron Emission Tomography-Computed Tomography, full name in Chinese is Positron Emission Computed Tomography) detectors have been widely used in the medical field. The main working principle of PET-CT for PET scanning is: when nuclear radiation enters the scintillator, it will ionize and excite the scintillator to emit fluorescence in all directions, and project the photons to the photomultiplier connected to the scintillator through the light guide and light collector. Tube (English full name is Photo Multiplier Tube, English abbreviation is PMT). Due to the photoelectric effect, electrons are knocked out, and the electrons are multiplied and accelerated in the PMT, forming a current pulse output on the anode, and then collected b...

AI Technical Summary

Problems solved by technology

However, due to factors such as the non-uniform response of the crystal, the inconsistency of the gain of the photomultiplier tube, the influence of the coupling agent between the crystal and the light guide, the light guide and the PMT on the light output, and the differences in the channels of the electronic circuit, the PET detector plane Different positions detect different single-energy gamma-ray sources, which leads to uneven counts in various positions or areas inside the detector, and too few counts in a certain position or area will lead to imaging corresponding to this position or area poor quality

Therefore, the uneven counting inside the PET detector will greatly deteriorate the uniformity of the imaging, and it will not be possible to obtain high-quality images

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