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首页> 外文会议>Physics of Medical Imaging pt.1; Progress in Biomedical Optics and Imaging; vol.8 no.29; Proceedings of SPIE-The International Society for Optical Engineering; vol.6510 pt.1 >Scattered radiation in flat-detector based cone-beam CT: propagation of signal, contrast and noise into reconstructed volumes
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Scattered radiation in flat-detector based cone-beam CT: propagation of signal, contrast and noise into reconstructed volumes

机译：基于平面探测器的锥束CT中的散射辐射：信号，对比度和噪声在重建体积中的传播

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This paper presents a novel framework for the systematic assessment of the impact of scattered radiation in flat-detector based cone-beam CT. While it is well known that scattered radiation causes three different types of artifacts in reconstructed images (inhomogeneity artifacts such as cupping and streaks, degradation of contrast, and enhancement of noise), investigations in the literature quantify the impact of scatter mostly only in terms of inhomogeneity artifacts, giving little insight, e.g., into the visibility of low contrast lesions. Therefore, for this study a novel framework has been developed that in addition to normal reconstruction of the CT (HU) number allows for reconstruction of voxelized expectation values of three additional important characteristics of image quality: signal degradation, contrast reduction, and noise variances. The new framework has been applied to projection data obtained with voxelized Monte-Carlo simulations of clinical CT data sets of high spatial resolution. Using these data, the impact of scattered radiation was thoroughly studied for realistic and clinically relevant patient geometries of the head, thorax, and pelvis region. By means of spatially resolved reconstructions of contrast and noise propagation, the image quality of a scenario with using standard anti-scatter grids could be evaluated with great detail. Results show the spatially resolved contrast degradation and the spatially resolved expected standard deviation of the noise at any position in the reconstructed object. The new framework represents a general tool for analyzing image quality in reconstructed images.
机译：本文提出了一个新的框架，用于系统评估基于平板探测器的锥束CT中的散射辐射。众所周知，散射辐射会在重建的图像中导致三种不同类型的伪影（不均匀伪影，例如拔罐和条纹，对比度下降以及噪声增强），但文献中的研究仅在以下方面量化了散射的影响：不均匀的伪影，几乎看不到例如低对比度病变的可见性。因此，对于本研究，已经开发出一种新颖的框架，除了可以正常重建CT（HU）数外，还可以重建三维图像质量的三个附加重要特征的体素化期望值：信号降级，对比度降低和噪声方差。新框架已应用于通过体格化蒙特卡洛模拟获得的投影数据，这些模拟是对高空间分辨率的临床CT数据集的模拟。使用这些数据，对于头部，胸部和骨盆区域的实际和临床相关患者几何形状，已彻底研究了散射辐射的影响。通过对分辨率和噪声传播进行空间分辨的重构，可以非常详细地评估使用标准防散射网格的场景的图像质量。结果表明，在空间上分辨的对比度下降以及在空间上的噪声在重构对象中任何位置的预期标准偏差。新框架代表了一种用于分析重建图像中图像质量的通用工具。

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