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A three-dimensional (3-D) phantom for the density distribution of the plasmasphere is established.The imaging processes of the extreme ultraviolet (EUV) Imager are computer-simulated,in which the Earth shelter is treated as a main problem.A modified ART method is devised to resolve the incomplete data reconstruction problem to validate and evaluate the proposed methods.The cone-beam EUV data are simulated based on the 3-D phantom from both a circular and semi-circular trajectodes.Quantitative reconstruction results demonstrate the correctness of the proposed modified ART algorithm.The CT technique can be used to calculate the global density of the plasmasphera from the EUV data.