FDK算法中一种新的插值方法的研究

基金项目:

国家自然科学基金(60532080)

详细信息

A New Interpolation Method in the FDK Algorithm

摘要: 在FDK算法的反投影过程中,插值是关键的一步,它直接影响到重建图像的速度和质量。本文针对探测器的结构特点,提出了一种新的插值方法。该方法实现了快速求解射线所经过体素的长度,且考虑到射线与体素中心的距离对加权的影响,从而使得加权值更加精确。实验结果表明,在FDK算法中,这个新的插值方法比传统的插值方法重建出来的图像边缘清晰,且能更好地抑制噪声。
- FDK算法 /
- 插值 /
- 体素
Abstract: In the back-projection process of the FDK algorithm,interpolation is an important step, which affects the speed and quality of reconstructed image directly. Based on the detector’s structure, this paper gives a new interpolation method. This method gets the length that the ray passed through the voxel fast, and considers that the distance between the ray and the central of voxel has an effect on the weight, thus makes the value of weight more accurate. The experimental results show that the FDK algorithm of this new interpolation method gives a better result in the verge of the reconstructed image than the traditional interpolation methods, and this new interpolation method can restrain noise effect better.
- FDK algorithm /
- interpolation /
- voxel