2016 Volume 34 Issue 4 Pages 186-197
Recently, three new designs of CT scanners called low-dose CT, sparse-view CT, and interior CT (local CT) have been proposed, and, image reconstruction algorithms corresponding to each scanner design have been investigated actively. Among them, in this paper, we review image reconstruction in the interior CT, which measures truncated projection data by radiating x-rays only to a small region of interest (ROI) such as heart or breast to reduce patient dose or to simplify measurement. In particular, we explain two exact reconstruction approaches discovered in the late 2000's, which have been considered a breakthrough in this field. The first approach does not rely on the compressed sensing (CS), and the second approach is strongly based on the CS technique.
