Reduction of coil mass artifacts in high-resolution flat detector conebeam CT of cerebral stent-assisted coiling.
Reduction of coil mass artifacts in high-resolution flat detector conebeam CT of cerebral stent-assisted coiling.
复制标题
在高分辨率的扁平探测器圆锥体CT中，脑支架辅助盘绕的圆锥形构造减少了线圈。
DOI：
10.3174/ajnr.a3561
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发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
Wakhloo AK
中科院分区：
文献类型：
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作者：
van der Bom IM;Hou SY;Puri AS;Spilberg G;Ruijters D;van de Haar P;Carelsen B;Vedantham S;Gounis MJ;Wakhloo AK
平板血管造影C形臂系统的发展使得神经血管支架和宿主动脉都能够非常详细地可视化，除了传统DSA之外还提供了补充的空间信息。然而，这些结构的可见性可能受到由相邻的无线电衰减对象生成的伪影的阻碍。我们报告了使用金属伪影减少（MAR）算法进行高分辨率对比增强CBCT（VasoCT），以进行支架辅助弹簧圈栓塞的随访成像。在接受支架辅助弹簧圈栓塞术的25例患者中采集了VasoCT数据。在有和没有MAR的情况下生成重建，并由三名经验丰富的神经放射科医生使用3分制进行审查。使用MAR时，观察者一致认为，在超过40%的病例中（κ = 0.6），可见性在评分量表上至少提高了一个点，并且在所有病例中，64%的病例中（κ = 0.6）条纹伪影未模糊周围结构。MAR改善了图像质量，在65%的病例中允许足够的可见性进行评价，在92%的病例中优于无MAR（κ = 0.9）。MAR评分显著较高（p < 0.0001）。尽管MAR无法完全消除由具有高X射线吸收的植入物引起的伪影，但我们已经证明VasoCT数据的图像质量得到了显著改善。伪影对可见性的影响因病例而异，但在大多数病例中，使用MAR的对比增强CBCT的整体可见性得到改善。
Developments in flat-panel angiographic c-arm systems have enabled visualization of both the neurovascular stents and host arteries in great detail, providing complementary spatial information in addition to conventional DSA. However, the visibility of these structures may be impeded by artifacts generated by adjacent radio-attenuating objects. We report on the use of a metal artifact reduction (MAR) algorithm for high resolution contrast-enhanced CBCT (VasoCT) for follow-up imaging of stent-assisted coil embolization. VasoCT data was acquired in 25 patients that underwent stent-assisted coiling. Reconstructions were generated with and without MAR and were reviewed by three experienced neuroradiologists using a 3-point scale. With MAR, the observers agreed that the visibility had improved by at least one point on the scoring scale in more than 40% of the cases (κ = 0.6) and that the streak artifact was not obscuring surrounding structures in 64% of all cases (κ = 0.6). MAR improved the image quality which allowed for visibility sufficient for evaluation in 65% of the cases, and was preferred over no MAR in 92% (κ = 0.9). Significantly higher scores were given with MAR (p < 0.0001). Although MAR is not capable of fully removing artifacts caused by implants with high x-ray absorption, we have shown that the image quality of VasoCT data is improved drastically. The impact of the artifacts on the visibility varied between cases, and yet the overall visibility of the contrast-enhanced CBCT with MAR improved in the majority of the cases.