| 甄琰明,张金铭,曲桂红,袁波,赵书俊.3D均中值滤波参数的选取对3D OSEM重建图像的影响[J].中国医学影像技术,2020,36(4): |
| 3D均中值滤波参数的选取对3D OSEM重建图像的影响 |
| Influence of 3D Mean-Median Filter Parameters Selection on 3D OSEM Reconstructed Images |
| 投稿时间：2019-10-15 修订日期：2020-04-13 |
| DOI： |
| 中文关键词: 正电子发射断层扫描 OSEM算法 滤波参数 |
| 英文关键词:Positron emission tomography OSEM algorithm Filtering parameters |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 目的 为了分析3D均值中值滤波参数的选取对OSEM重建图像的影响，采用3D均值中值滤波器对重建前的投影数据进行滤波处理，并调整参数进行定量分析。资料与方法 对分析模拟软件ASIM模拟的三维模体投影数据进行3D 均值中值滤波处理。利用开源断层图像重建软件STIR中的OSEM算法对滤波前后的投影数据进行重建，视觉和定量评估重建图像。结果 滤波参数与图像质量密切相关。值过大，重建图像边缘保持效果较差，图像过平滑。值过小，不能抑制噪声，导致重建图像细节模糊。 结论 重建图像的噪声大小以及边缘保持效果对滤波参数的选取是十分敏感的。可根据梯度分布直方图确定滤波参数选取范围，再结合梯度分布比从该范围内折中选择合适的参数，达到既去除噪声又保护图像边缘的目的。 |
| 英文摘要: |
| Purpose In order to analyze the influence of 3D mean-median filter parameter on OSEM reconstruction images. we applied 3D mean-median filter to process the projection data before reconstruction, and adjusted the parameter for quantitative analysis. Materials and Methods The 3D mean-median filter was applied to process the 3D phantom projection data simulated by the Analytical Simulator (ASIM). The OSEM algorithm of open source tomographic image reconstruction (STIR) is used to reconstruct the projection data before and after filtering. Finally, the reconstructed image was visually and quantitatively evaluated. Results The filter parameteris closely related to image quality. If thevalue is too large, the edge preservation capability of image is poor, and the image is too smooth. If thevalue is too small to suppress noise, resulting in blurred details of image. Conclusion In conclusion, the noise level and edge preservation effect of the image are very sensitive to the selection of filtering parameter. We could select the range of filtering parameter according to the distribution of gradient histogram .Then the appropriate parameter is choosed by combining with the gradient distribution ratio, so as to remove noise and retain edge characteristic. |
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