Method for correcting image depth effect

Abstract

The invention discloses a method for correcting image depth effect which is used for correcting an original image which is obtained from a positron emission tomography by a filtered back projection rebuilding algorithm. In the method, probability distribution data used for image distribution rebuilding at each point within the visual range of a detector of the positron emission tomography is beforehand obtained; then the probability distribution data is processed by the filtered back projection rebuilding algorithm; the depth effect image removal is carried out on the probability distribution data in order of from an outermost ring to an innermost ring; and removed part is transformed into a corresponding exact image to compensate the original image, so as to finish the correction of the depth effect. According to the invention, original software kernel is not required to be amended at all, the correction of DOI effect can be finished just by the superaddition based on the original software, and the invention has flexible operation and also saves time.

Description

technical field [0001] The invention relates to a positron emission tomography scanner, in particular to an image depth effect correction method for the positron emission tomography scanner. Background technique [0002] When a positron emission tomography scanner (Position Emission Tomogramny, referred to as PET) is used for medical imaging, it is first necessary to inject a biological tracer drug containing a radionuclide into the patient's body. After the biological tracer drug is introduced into the human body, The internal nuclides participate in the life activities of organs, tissues, and cells in the body, and will decay to release a pair of gamma photons with the same energy and opposite direction, and then PET captures the pair of gamma photons for image reconstruction, so as to obtain Find the lesion in the patient's body. [0003] In traditional PET technology, the gamma photons are captured by the crystal strip in the PET detector. Generally, the inner end face ...

AI Technical Summary

Problems solved by technology

This software method needs to correct the data before it is input into the reconstruction algorithm, and the data correction and processing methods of different PET detector configurations are also different, so the kernel of the software part of PET needs to be modified for different PET detector configurations. Correction, this method is inflexible in operation and slow in calculation speed, which is not conducive to practical applications, and for those areas where the DOI effect is not obvious or the image value is 0, it must go through a complicated correction process, which is a waste of time and resources.

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