Editing CT scan (section)

=== PET CT ===
{{main|PET-CT}}
[[File:Petct1.jpg|thumb|left|PET-CT scan of chest]]
Positron emission tomography–computed tomography is a hybrid CT modality which combines, in a single gantry, a [[positron emission tomography]] (PET) scanner and an X-ray computed tomography (CT) scanner, to acquire sequential images from both devices in the same session, which are combined into a single superposed ([[Image registration|co-registered]]) image. Thus, [[functional imaging]] obtained by PET, which depicts the spatial distribution of metabolic or biochemical activity in the body can be more precisely aligned or correlated with anatomic imaging obtained by CT scanning.<ref>{{Cite journal |last1=Blodgett |first1=Todd M. |last2=Meltzer |first2=Carolyn C. |last3=Townsend |first3=David W. |date=February 2007 |title=PET/CT: form and function |url=https://pubmed.ncbi.nlm.nih.gov/17255408/#:~:text=CT%20is%20complementary%20in%20the,identify%20and%20localize%20functional%20abnormalities. |journal=Radiology |volume=242 |issue=2 |pages=360–385 |doi=10.1148/radiol.2422051113 |issn=0033-8419 |pmid=17255408}}</ref>

PET-CT gives both anatomical and functional details of an organ under examination and is helpful in detecting different type of cancers.<ref>{{Cite journal |last1=Ciernik |first1=I.Frank |last2=Dizendorf |first2=Elena |last3=Baumert |first3=Brigitta G |last4=Reiner |first4=Beatrice |last5=Burger |first5=Cyrill |last6=Davis |first6=J.Bernard |last7=Lütolf |first7=Urs M |last8=Steinert |first8=Hans C |last9=Von Schulthess |first9=Gustav K |date=November 2003 |title=Radiation treatment planning with an integrated positron emission and computer tomography (PET/CT): a feasibility study |url=https://doi.org/10.1016/S0360-3016(03)00346-8 |journal=International Journal of Radiation Oncology, Biology, Physics |volume=57 |issue=3 |pages=853–863 |doi=10.1016/s0360-3016(03)00346-8 |pmid=14529793 |issn=0360-3016}}</ref><ref>{{Cite journal |last1=Ul-Hassan |first1=Fahim |last2=Cook |first2=Gary J |date=August 2012 |title=PET/CT in oncology |journal=Clinical Medicine |volume=12 |issue=4 |pages=368–372 |doi=10.7861/clinmedicine.12-4-368 |issn=1470-2118 |pmc=4952129 |pmid=22930885}}</ref>