Scattering correction method and device, readable storage medium and electronic equipment
A technology of scatter correction and scatter distribution, applied in computerized tomography scanners, instruments for radiological diagnosis, medical science, etc., can solve problems such as image quality degradation, underestimation of scattering events, and under-correction of scatter, so as to avoid under-correction , optimize image quality, and improve the effect of scattering correction accuracy
Active Publication Date: 2020-04-28
SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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In this case, the estimate of the scatter distribution from the single scatter simulation will be lower than the actual situation, resulting in underestimation of scattering events and undercorrection of scatter, leading to image degradation
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[0028] As explained in the background technology, the conventional single-scattering simulation method does not consider multiple scattering, so it will cause under-correction when performing scatter estimation on larger objects (such as humans or other animals), result in reduced image quality.
[0029]In the related art, in order to supplement the multiple scattering part, a complete Monte Carlo simulation can be used for scattering estimation or a multiple scattering model can be added. However, whether the scattering distribution is estimated using a full Monte Carlo simulation or adding multiple scattering models to estimate the scattering distribution, both methods require more computational steps and simulation processes, which will greatly increase the required reconstruction time.
[0030] In this regard, the present disclosure provides a scatter correction method, device, computer-readable storage medium and electronic equipment, so as to improve the accuracy of scat...
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The invention relates to a scattering correction method and device, a readable storage medium and electronic equipment. The method comprises the following steps: for each target crystal pair in a plurality of target crystal pairs in a detector, acquiring an average attenuation coefficient of a scattering region of a detected body corresponding to the target crystal pair; according to the average attenuation coefficient of the scattering region corresponding to each target crystal pair, determining a target low-energy threshold value corresponding to each target crystal pair by using a pre-established corresponding relationship between attenuation coefficient and low-energy threshold value, wherein in the corresponding relationship, the larger the attenuation coefficient is, the smaller thecorresponding low-energy threshold value is; performing scattering distribution estimation of single scattering simulation by utilizing the corresponding target low-energy threshold of each target crystal pair; and performing scattering correction according to a scattering distribution estimation result. Therefore, more accurate scattering distribution can be obtained, the scattering correction accuracy is improved, the image quality is optimized, and the PET reconstruction imaging time is effectively saved.
Description
technical field [0001] The present disclosure relates to the technical field of positron emission tomography, and in particular, to a scattering correction method, device, readable storage medium and electronic equipment. Background technique [0002] Positron emission tomography (PET) is a nuclear medicine detector used to observe the body's metabolic process. The principle is to inject isotope-labeled drugs with positron emission into the human body. These drugs occur during the physiological metabolic process of the human body. The annihilation effect generates two back-to-back emitted gamma rays with an energy of 0.511 MeV. [0003] PET reconstruction imaging relies on projection data obtained by detecting simultaneously emitted photons. Ideally, when two photons are detected simultaneously within the coincidence time window, the annihilation location can be located along the coincidence line connecting the detection locations. In practice, gamma undergoes Compton scat...
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IPC IPC(8): A61B6/03
CPCA61B6/037A61B6/4411A61B6/4266A61B6/508A61B6/5282
Inventor 李新颖梁国栋王希赵健徐保伟
Owner SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD