Mohd Amin, Adam Tan, et al. “Development of a 4D Digital Phantom for Cone-Beam CT (CBCT) Imaging on the Varian On-Board Imager (OBI)”. International Journal of Integrated Engineering, vol. 11, no. 3, Sept. 2019, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4543.