iMinds-Vision Lab, University of Antwerp, Antwerpen, Belgium.
iMinds-Vision Lab, University of Antwerp, Antwerpen, Belgium Centrum Wiskunde & Informatica (CWI), Amsterdam, The Netherlands.
J Xray Sci Technol. 2014;22(1):77-89. doi: 10.3233/XST-130410.
In computed tomography (CT), the source-detector system commonly rotates around the object in a circular trajectory. Such a trajectory does not allow to exploit a detector fully when scanning elongated objects.
Increase the spatial resolution of the reconstructed image by optimal zooming during scanning.
A new approach is proposed, in which the full width of the detector is exploited for every projection angle. This approach is based on the use of prior information about the object's convex hull to move the source as close as possible to the object, while avoiding truncation of the projections.
Experiments show that the proposed approach can significantly improve reconstruction quality, producing reconstructions with smaller errors and revealing more details in the object.
The proposed approach can lead to more accurate reconstructions and increased spatial resolution in the object compared to the conventional circular trajectory.
在计算机断层扫描（CT）中，源探测器系统通常围绕物体以圆形轨迹旋转。这种轨迹在扫描细长物体时无法充分利用探测器。
通过扫描时的最佳缩放来提高重建图像的空间分辨率。
提出了一种新方法，该方法在每个投影角都充分利用探测器的全宽度。该方法基于使用有关物体凸包的先验信息来使源尽可能靠近物体，同时避免投影的截断。
实验表明，所提出的方法可以显著提高重建质量，产生具有较小误差的重建结果，并显示物体中更多的细节。
与传统的圆形轨迹相比，所提出的方法可以在物体中实现更准确的重建和更高的空间分辨率。
