Cycloidal Computed Tomography
Cycloidal Computed Tomography
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DOI：
10.1103/physrevapplied.14.014069
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发表时间：
2020-07-23
影响因子：
4.6
通讯作者：
Olivo, Alessandro
中科院分区：
文献类型：
--
作者：
Hagen, Charlotte K.;Vittoria, Fabio A.;Olivo, Alessandro
提出了一种通用的概念，用于以灵活的方式提高计算机层析成像中的层内空间分辨率，并且具有相对较大的源焦点和探测器像素。这种灵活性是用面罩形状的薄束阵列探测样品的结果。假设掩模孔径小于X射线源和探测器的组合模糊，并且小光束之间没有明显的重叠，这就将更高的空间频率引入成像过程。应用摆线采集方案，通过该方案，样品同时旋转和平移，有助于有效地利用这些频率并将其重建成高分辨率断层图像。此外，初步研究了信噪比与给药剂量的关系，显示了显著的剂量节约潜力。
A general concept is presented for increasing the in-slice spatial resolution in computed tomography in a flexible manner and with relatively large source focal spots and detector pixels. The flexibility is a result of probing the sample with an array of thin beamlets shaped by a mask. Provided that the mask apertures are smaller than the combined blur of the x-ray source and detector and that no significant overlap between beamlets occurs, this introduces higher spatial frequencies into the image-formation process. The appli-cation of a cycloidal acquisition scheme, by which the sample is simultaneously rotated and translated, facilitates an efficient exploitation of these frequencies and their reconstruction into high-resolution tomo-graphic images. Additionally, a preliminary study of the signal-to-noise ratio versus the delivered dose reveals significant dose-saving potential.