Scout-view assisted interior micro-CT.

Scout-view assisted interior micro-CT.
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DOI:
10.1088/0031-9155/58/12/4297
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发表时间:
2013-06-21
影响因子:
3.5
通讯作者:
Wang G
Wang G
中科院分区:
工程技术2区
文献类型:
--
作者:
Sen Sharma K;Holzner C;Vasilescu DM;Jin X;Narayanan S;Agah M;Hoffman EA;Yu H;Wang G

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微型计算机断层扫描(micro-CT)是一种广泛使用的成像技术。微型 CT 的一个挑战是定量重建大于探测器视场 (FOV) 的样本。这种场景的特点是投影被截断和相关的图像伪影。然而,对于这种截断的扫描,经常采集具有增加的视场的低分辨率侦察扫描,以便正确定位样本。这项研究表明,否则被丢弃的侦察扫描可以提供足够的附加信息来独特且稳定地重建感兴趣的内部区域。设计了两种内部重建方法来利用多分辨率数据,而不需要大量的计算开销。虽然大多数先前的研究使用数字截断的全局投影作为内部数据,但本研究使用真正的混合扫描,其中全局和内部扫描以不同的分辨率进行。此外,由于缺乏标准的内部微型 CT 模型,我们为本研究设计和制造了新型内部微型 CT 模型,为我们的算法提供验证手段。最后,扫描了来自不同研究的两个特征样本,以显示我们重建的效果。所提出的方法比现有的重建算法有显着的改进。
Micro computed tomography (micro-CT) is a widely-used imaging technique. A challenge of micro-CT is to quantitatively reconstruct a sample larger than the field-of-view (FOV) of the detector. This scenario is characterized by truncated projections and associated image artifacts. However, for such truncated scans, a low resolution scout scan with an increased FOV is frequently acquired so as to position the sample properly. This study shows that the otherwise discarded scout scans can provide sufficient additional information to uniquely and stably reconstruct the interior region of interest. Two interior reconstruction methods are designed to utilize the multi-resolution data without a significant computational overhead. While most previous studies used numerically truncated global projections as interior data, this study uses truly hybrid scans where global and interior scans were carried out at different resolutions. Additionally, owing to the lack of standard interior micro-CT phantoms, we designed and fabricated novel interior micro-CT phantoms for this study to provide means of validation for our algorithms. Finally, two characteristic samples from separate studies were scanned to show the effect of our reconstructions. The presented methods show significant improvements over existing reconstruction algorithms.
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