Micro-computed tomography (micro-CT) is a widely used state-of-the-art
instrument employed to study the morphological structures of objects in various
fields. Object-rotation is a classical scanning mode in micro-CT allowing data
acquisition from different angles; however, its field-of-view (FOV) is
primarily constrained by the size of the detector when aiming for high spatial
resolution imaging. Recently, we introduced a novel scanning mode called
multiple source translation CT (mSTCT), which effectively enlarges the FOV of
the micro-CT system. Furthermore, we developed a virtual projection-based
filtered backprojection (V-FBP) algorithm to address truncated projection,
albeit with a trade-off in acquisition efficiency (high resolution
reconstruction typically requires thousands of source samplings). In this
paper, we present a new algorithm for mSTCT reconstruction,
backprojection-filtration (BPF), which enables reconstructions of
high-resolution images with a low source sampling ratio. Additionally, we found
that implementing derivatives in BPF along different directions (source and
detector) yields two distinct BPF algorithms (S-BPF and D-BPF), each with its
own reconstruction performance characteristics. Through simulated and real
experiments conducted in this paper, we demonstrate that achieving same
high-resolution reconstructions, D-BPF can reduce source sampling by 75%
compared with V-FBP. S-BPF shares similar characteristics with V-FBP, where the
spatial resolution is primarily influenced by the source sampling.

本文介绍了一种名为 mSTCT 的新的扫描模式和 backprojection-filtration 的新算法，能够有效地提高微 CT 系统的视野和高分辨率重建效率，并且在模拟和实验中验证了该算法的可行性。