Editing Radiography (section)

===Computed tomography===
{{Main|Computed tomography}}
[[File:Ct-workstation-neck.jpg|thumb|Images generated from [[computed tomography]], including a [[3D rendering|3D rendered]] image at upper left]]

[[Computed tomography]] or CT scan (previously known as CAT scan, the "A" standing for "axial") uses ionizing radiation (x-ray radiation) in conjunction with a computer to create images of both soft and hard tissues. These images look as though the patient was sliced like bread (thus, "tomography" – "tomo" means "slice"). Though CT uses a higher amount of ionizing x-radiation than diagnostic x-rays (both utilising X-ray radiation), with advances in technology, levels of CT radiation dose and scan times have reduced.<ref>{{cite journal | vauthors = Jang J, Jung SE, Jeong WK, Lim YS, Choi JI, Park MY, Kim Y, Lee SK, Chung JJ, Eo H, Yong HS, Hwang SS | display-authors = 6 | title = Radiation Doses of Various CT Protocols: a Multicenter Longitudinal Observation Study | journal = Journal of Korean Medical Science | volume = 31 |issue=Suppl 1 | pages = S24-31 | date = February 2016 | pmid = 26908984 | pmc = 4756338 | doi = 10.3346/jkms.2016.31.S1.S24 }}</ref> CT exams are generally short, most lasting only as long as a breath-hold, [[Radiocontrast|Contrast agents]] are also often used, depending on the tissues needing to be seen. Radiographers perform these examinations, sometimes in conjunction with a radiologist (for instance, when a radiologist performs a CT-guided [[biopsy]]).