Image reconstruction from data over two orthogonal arcs of limited-angular ranges.
Image reconstruction from data over two orthogonal arcs of limited-angular ranges.
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作者：
在有限角度范围（LAR）上的计算机断层摄影（CT）扫描在可能减少成像剂量和时间以及在非标准扫描的设计中具有实际意义。这项工作的目的是研究图像重建的两个不重叠的弧的LAR，并证明他们可能允许更准确的图像重建比可能是一个单一的弧的LAR。我们考虑一种具有两个不重叠的LAR弧和的构型，其中心相隔90°，并将其称为两个正交弧构型。数据从具有两个正交弧配置的胸部体模在18°至180°的总角度覆盖范围内生成，并且随后通过使用方向全变差（DTV）算法来重建图像。为了比较，我们还考虑了角范围的单弧配置的图像重建。定量指标，如归一化均方根误差（nRMSE）用于评价图像重建精度。重建图像的视觉检查和定量分析表明，一个两个正交的弧配置一般产生更准确的图像重建比它的单弧对应。随着总角度范围的增加，DTV算法产生具有增强的精度的图像重建，如所期望的。此外，如果保持恒定，则双正交弧配置通常导致比双正交弧配置更准确的图像重建，因为前者的nRMSE可以比后者的nRMSE低多达一个数量级。适当设计的两个正交弧配置可以用于在具有减小的角度覆盖的CT成像中提高图像重建精度。这项研究可能会产生对创新CT扫描设计的见解，以降低扫描时间和辐射剂量，和/或避免扫描碰撞，例如，C形臂CT
Computed tomography (CT) scanning over limited-angular ranges (LARs) is of practical interest in possible reduction of imaging dose and time and in design of non-standard scans. This work aims to investigate image reconstruction for two non-overlapping arcs of LARs, and to demonstrate that they may allow more accurate image reconstruction than may a single arc of LAR. We consider a configuration with two non-overlapping arcs of LARs and , whose centers are separated by 90°, and refer to it as a two-orthogonal-arc configuration. Data are generated from a chest phantom with two-orthogonal-arc configurations over total angular coverage ranging from 18° to 180°, and images are reconstructed subsequently by use of the directional-total-variation (DTV) algorithm. For comparison, we also consider image reconstruction for a single-arc configuration of angular range . Quantitative metrics such as the normalized root-mean-square-error (nRMSE) are used for evaluation of image reconstruction accuracy. Visual inspection and quantitative analysis of images reconstructed reveal that a two-orthogonal-arc configuration generally yields more accurate image reconstruction than does its single-arc counterpart. As total angular range increases, the DTV algorithm yields image reconstruction with enhanced accuracy, as expected. Also, if remains constant, the two-orthogonal-arc configuration with generally leads to image reconstruction more accurate than those of two-orthogonal-arc configurations with , as the nRMSE of the former can be lower than that of the latter for up to more than one order of magnitude. Appropriately designed two-orthogonal-arc configurations may be exploited for improving image-reconstruction accuracy in CT imaging with reduced angular coverage. This study may yield insights into the design of innovative CT scans for lowering scan time and radiation dose, and/or for avoiding scan collision in, e.g., C-arm CT.
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