| 基于特殊窗函数的局部CT图像重建算法及其分析 |
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| 引用本文： | 宋沛然,渠刚荣.基于特殊窗函数的局部CT图像重建算法及其分析[J].CT理论与应用研究,2009,18(3). |
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| 作者姓名： | 宋沛然 渠刚荣 |
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| 作者单位： | 北京交通大学,理学院,北京,100044 |
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| 基金项目： | 国家自然科学基金(60772041) |
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| 摘 要： | 为了减少X射线对人体的伤害,局部图像重建成为人们研究的重点之一.本文研究了基于一种特殊窗函数的局部图像重建算法.通常,直接用局部区域的投影数据重建局部图像,会使重建图像产生常数偏移,我们将局部区域边缘的投影数据延拓为相应沿径向未知投影数据的方法,改进了局部重建图像,并给出了基于特殊窗函数重建时,该方法的误差分析.另外,本文将该算法应用于扇形束图像重建,并通过数值实验验证了此特殊窗函数应用于扇形束重建时同样有效.
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| 关 键 词： | 局部重建 误差分析 扇形束 特殊窗函数 |
Local Reconstruction Algorithm Based on the Special Filter and Its Analysis |
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| SONG Pei-ran,QU Gang-rong.Local Reconstruction Algorithm Based on the Special Filter and Its Analysis[J].Computerized Tomography Theory and Applications,2009,18(3). |
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| Authors: | SONG Pei-ran QU Gang-rong |
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| Institution: | SONG Pei-ran,QU Gang-rong(School of Science,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | In order to reduce the harm of X-ray on human body,local reconstruction is becoming one of the important studies in image reconstruction.The local reconstruction algorithm based on the special filter is studied.Reconstructing the local image by using the projection data through the region of interest(ROI),generates the unknown constant bias in the reconstructed image in general.By making continuation along the radial direction,the unknown projections are derived from the projections in the ROI.And by recons... |
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| Keywords: | local reconstruction error analysis fan beam special filter |
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