在研究从投影重建图像的算法时，为了比较客观的评价各种重建算法的有效性，人们常选用公认的Sheep Logan 头模型,本文就是用CT重建的理论模型，希望对大家有用-In the study from the projection image reconstruction algorithm, in order to more objective evaluation of the effectiveness of the various reconstruction algorithms, it is often used in a recognized Sheep Logan head model, this paper is to use CT reconstruction of the theoretical model and hope for all of us