To solve the problem that metal artifacts severely damage the clarity of the organization structure in computed tomography（CT） images, a sinogram fusion-based metal artifact correction method is proposed. First, the...
详细信息
To solve the problem that metal artifacts severely damage the clarity of the organization structure in computed tomography（CT） images, a sinogram fusion-based metal artifact correction method is proposed. First, the metal image is segmented from the original CT image by the pre-set threshold. The original CT image and metal image are forward projected into the original projection sinogram and metal projection sinogram, respectively. The interpolation-based correction method and mean filter are used to correct the original CT image and preserve the edge of the corrected CT image, respectively. The filtered CT image is forward projected into the filtered image sinogram. According to the position of the metal sinogram in the original sinogram and filtered image sinogram, the corresponding sinograms PM^D （ in the original sinogram） and PM^C （ in the filtered image sinogram）can be acquired from the original sinogram and filtered image sinogram, respectively. Then, PM^D and PM^C are fused into the fused metal sinogram PM^F according to a certain *** final sinogram can be acquired by fusing PM^F , PM^D and the original sinogram P^O. Finally, the final sinogram is reconstructed into the corrected CT image and metal information is compensated into the corrected CT *** on clinical images demonstrate that the proposed method can effectively reduce metal artifacts. A comparison with classical metal artifacts correction methods shows that the proposed metal artifacts correction method performs better in metal artifacts suppression and tissue feature preservation.
社会网络中节点的移动特点可以归结为强移动性和弱移动性两种类型。提出的MTBR(Mobile-Tendency Based Routing)算法引入了移动倾向的概念,将人的移动习惯与节点的移动规律进行关联。该算法通过检测出社会网络中强移动性节点的移动倾向...
详细信息
社会网络中节点的移动特点可以归结为强移动性和弱移动性两种类型。提出的MTBR(Mobile-Tendency Based Routing)算法引入了移动倾向的概念,将人的移动习惯与节点的移动规律进行关联。该算法通过检测出社会网络中强移动性节点的移动倾向,并利用强移动节点来携带数据并进行数据转发。实验数据表明,节点移动性越强其移动倾向越明显;相较于同类算法,MTBR算法可以有效地将消息向较远的目的地转发,其产生的转发能耗较低,送达率更稳定。
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