  Medical imaging modalities have revolutionized health-care approaches by
offering a better understanding of the human anatomy. Discovery of x-rays
allowed the exploiting of the micro-scaled information of human anatomy.
Computed tomography is one of the well-known imaging modalities using x-rays to
create images of medical and non-medical objects. CT imaging has several
variety of applications from medical diagnosis to industrial non-destructive
testing. In this paper, we review computed tomography imaging modality and its
applications in screening, diagnosis, and treatment and study some of the novel
techniques used to reconstruct images in these machines.
