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In positron emission tomography the number of factors, which distort the tomogram being obtained, exists. One of these factors is the solid angle fraction. Using the numeric simulation the influence of the solid angle fraction on the reconstruction quality of spatial source distribution depending on the object dimensions and the radius of the position-sensitive detector has been studied. The new iterative method for the distortion correction in the reconstructed image has been proposed. The uniform deviation of the reconstructed image from the given one has been calculated depending on the number of the correction algorithm iterations. The results obtained can be used both to improve the quality of tomogram reconstruction for standard algorithms reconstructing the spatial distribution of radiation sources, and to develop a new software for existing tomographs.
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