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中文摘要：
联合代数迭代方法（sART）对重建图像空间是无约束的，其迭代到一定次数后，图像空间的噪声会不断增加。为了解决这一问题，针对三维锥束CT情况，研究了一种增加惩罚项的联合代数迭代算法，同时研究了该算法与有序子集结合的方法。计算机仿真试验表明：在锥束CT图像重建中，该方法能够在抑制噪声的同时提高重建图像的收敛速度。
英文摘要：
In SART （Simultaneous Algebraic Reconstruction Technique）,there is no restrict to image space,so the image space＇s noise will increase after the definite number of iteration.In order to solve this problem,for three dimensional cone-beam CT,a penalty SART is researched,at the same time,this means combined with ordered subsets is also researched.Computer simulation experiment results show that,in cone-beam CT image reconstruction,this means can improve the convergence speed of image reconstruction and reduce the effect coming from the noise.
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The construction of 2D rotationally invariant wavelets and their application in image edge detection
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