【摘要】 近年来发展的小波重建方法可以直接重建得到图像的小波系数,而且可以只利用通过感兴趣区域的局部投影数据进行重建,从而在进行局部重建时节省了计算时间。在进行小波重建时,不同的小波对重建效果有着不同的影响。主要讨论了Daubechies正交小波和双正交小波的重建效果,并总结了实际应用中小波选取的一些原则。更多还原

【Abstract】 The image reconstruction in the computed tomography is completed by the inverse Radon transform,and the normal method is called filtered backprojection. But in this method, all the projection data must be processed even if only the local image is reconstructed. The wavelet reconstruction developed in recent years can get the wavelet coefficients directly from the projection data and it can reconstruct the local wavelet coefficients only with the projection data passing through the objects of interest. In the reconstruction, the selection of different wavelets affects the effect of wavelet reconstruction. This paper analyzes the reconstruction with the Daubechies wavelets and the biorthogonal wavelets and proposes some principles for selecting the wavelet.更多还原