2016 Volume 34 Issue 2 Pages 123-127
Recently, region-setting CT has been studied as an ROI imaging method. This technique can strongly reduce the radiation dose by limiting the irradiation field. For this reason, mathematical studies to reduce the truncation artifact have been conducted. However, no experimental studies have so far been performed. In this study, we developed a two-dimensional region-setting CT system and performed basic evaluations, such as those of its imaging properties. As an experimental system, we developed a micro-CT system with two-channel active collimators. In this way, truncated projection data only including selected region can be captured. Empty regions of the collimated projection data were corrected. Finally, the slice image was obtained by image reconstruction using the filtered back projection algorithm. In the experiments, the shape reproducibility and image quality of the reconstruction image were evaluated and were found to be similar to those of conventional scan images. In addition, radiation dose of the proposed method was reduced strongly. These results indicate that this system may be useful for the dose reduction of X-ray CT systems.
