Dual-energy CT imaging with limited-angular-range data.
Dual-energy CT imaging with limited-angular-range data.
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DOI：
10.1088/1361-6560/ac1876
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发表时间：
2021-09-17
影响因子：
3.5
通讯作者：
Pan X
中科院分区：
文献类型：
--
作者：
Chen B;Zhang Z;Xia D;Sidky EY;Pan X
在双能量计算机断层扫描（DECT）中，通常在360°的全角度范围（FAR）内收集低kVp和高kVp数据。虽然存在强烈的兴趣，在DECT与低和高kVp的数据采集有限的角度范围（LARs），仍然很少有调查的图像重建DECT与LAR数据。我们通过使用方向全变分（DTV）算法，研究了在180° LAR范围内，从低和高kVp数据中最小化LAR伪影的图像重建。从LAR数据的图像重建被公式化为凸优化问题，其中在沿着正交轴对图像的DTV进行约束的情况下使数据最小化。然后，我们通过应用DTV算法来解决优化问题，实现图像重建。我们进行数值研究，从弧的LARs，范围从14°到180°，并进行视觉检查和定量分析重建的图像生成的数据。利用DTV算法从LAR数据获得的感兴趣的单色图像显示出在利用现有算法获得的图像中经常观察到的显著减少的伪影。改进的图像质量还导致对感兴趣的物理量的准确估计，诸如有效原子序数和碘造影剂浓度。我们的研究表明，从低-和高-kVp的LAR数据，单色图像可以获得视觉上，和物理量可以估计是定量的，在FAR DECT中获得的。由于LAR DECT具有很高的实际应用价值，本文的研究结果对LAR DECT的设计具有实际应用意义。
In dual-energy computed tomography (DECT), low- and high-kVp data are collected often over a full-angular range (FAR) of 360°. While there exists strong interest in DECT with low- and high-kVp data acquired over limited-angular ranges (LARs), there remains little investigation of image reconstruction in DECT with LAR data. we investigate image reconstruction with minimized LAR artifacts from low- and high-kVp data over LARs of ⩽180° by using a directional-total-variation (DTV) algorithm. image reconstruction from LAR data is formulated as a convex optimization problem in which data-ℓ2 is minimized with constraints on image’s DTVs along orthogonal axes. We then achieve image reconstruction by applying the DTV algorithm to solve the optimization problem. We conduct numerical studies from data generated over arcs of LARs, ranging from 14° to 180°, and perform visual inspection and quantitative analysis of images reconstructed. monochromatic images of interest obtained with the DTV algorithm from LAR data show substantially reduced artifacts that are observed often in images obtained with existing algorithms. The improved image quality also leads to accurate estimation of physical quantities of interest, such as effective atomic number and iodine contrast concentration. our study reveals that from LAR data of low- and high-kVp, monochromatic images can be obtained that are visually, and physical quantities can be estimated that are quantitatively, comparable to those obtained in FAR DECT. as LAR DECT is of high practical application interest, the results acquired in the work may engender insights into the design of DECT with LAR scanning configurations of practical application significance.
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