Brain PET attenuation correction method and device based on sinogram, equipment and medium

The invention provides a sinogram-based brain PET (positron emission tomography) attenuation correction method, device and equipment and a medium, and the method directly uses a PET image to carry out attenuation correction without additional CT assistance of other equipment, so that the cost is greatly reduced, and artifacts caused by registration errors are avoided; the initial three-dimensional PET image is subjected to layer cutting projection to form the brain contour sinogram, the brain contour sinogram is subjected to filtering back projection, the skull image is obtained, the contour size of each preset area in the skull image is calculated according to the attenuation model, and the two-dimensional attenuation image is generated, so that direct use of PET image segmentation is avoided, and the problems of low resolution of the PET image and high resolution of the skull image are solved. Therefore, the segmentation result of the PET image is more accurate and clearer; through the OSEM iterative algori