Frequency selective signal extrapolation for compensation of missing data in sinograms
Frequency selective signal extrapolation for compensation of missing data in sinograms
复制标题
用于补偿正弦图中缺失数据的频率选择性信号外推
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Udías
中科院分区：
文献类型：
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作者：
J. Herraiz;S. España;E. Vicente;E. Herranz;M. Desco;J. Vaquero;J. Udías
我们提出了一种方法来补偿正电子发射断层扫描（PET）中丢失的投影数据，这可能是由于相邻探测器之间的间隙或探测器故障造成的。为了防止在使用傅立叶重组 (FORE) 或分析重建算法时重建中出现伪影，需要填充数据间隙。这种在重建之前对正弦图数据插值的新方法基于最初提出的简单迭代频率选择性信号外插方法，并成功应用于图像和视频通信中的错误隐藏。在这项工作中，利用正弦图频率允许区域中众所周知的限制对该方法进行了改进。我们在正弦图及其重建图像中定量比较该技术的结果与先前提出的间隙填充程序。所提出的技术优于这些方法，并且不需要太多的计算时间。
We present a method to compensate for missing projection data in positron emission tomography (PET), which may result from gaps between adjacent detectors or from malfunctioning detectors. To prevent artifacts in the reconstruction when using Fourier rebinning (FORE) or analytical reconstruction algorithms, filling the data gaps is required. This new approach for sinogram data interpolation prior to reconstruction is based on a simple iterative frequency selective signal extrapolation method initially proposed and successfully applied for error concealment in image and video communication. In this work the method has been improved taking advantage of well known restrictions in the allowed region of frequencies of the sinograms. We compare quantitatively the results of this technique with previously proposed gap filling procedures in both the sinograms and in their reconstructed images. The proposed technique outperforms those methods without requiring too much computational time.