Editing CT scan (section)

=== CT perfusion imaging ===
{{main|CT Perfusion}}
[[File:CT perfusion in M1 artery occlusion.png|thumb|CT Perfusion scan of the brain]]
CT perfusion imaging is a specific form of CT to assess flow through [[blood vessel]]s whilst injecting a [[contrast agent]].<ref name=":0">{{Cite journal |last1=Wittsack |first1=H.-J. |last2=Wohlschläger |first2=A.M. |last3=Ritzl |first3=E.K. |last4=Kleiser |first4=R. |last5=Cohnen |first5=M. |last6=Seitz |first6=R.J. |last7=Mödder |first7=U. |date=2008-01-01 |title=CT-perfusion imaging of the human brain: Advanced deconvolution analysis using circulant singular value decomposition |journal=Computerized Medical Imaging and Graphics |volume=32 |issue=1 |pages=67–77 |doi=10.1016/j.compmedimag.2007.09.004 |issn=0895-6111 |pmid=18029143}}</ref> Blood flow, blood transit time, and organ blood volume, can all be calculated with reasonable [[sensitivity and specificity]].<ref name=":0" /> This type of CT may be used on the [[heart]], although sensitivity and specificity for detecting abnormalities are still lower than for other forms of CT.<ref>{{Cite journal |last1=Williams |first1=M.C. |last2=Newby |first2=D.E. |date=2016-08-01 |title=CT myocardial perfusion imaging: current status and future directions |journal=Clinical Radiology |volume=71 |issue=8 |pages=739–749 |doi=10.1016/j.crad.2016.03.006 |issn=0009-9260 |pmid=27091433}}</ref> This may also be used on the [[brain]], where CT perfusion imaging can often detect poor brain perfusion well before it is detected using a conventional spiral CT scan.<ref name=":0" /><ref name=":1">{{Cite journal |last1=Donahue |first1=Joseph |last2=Wintermark |first2=Max |date=2015-02-01 |title=Perfusion CT and acute stroke imaging: Foundations, applications, and literature review |journal=Journal of Neuroradiology |volume=42 |issue=1 |pages=21–29 |doi=10.1016/j.neurad.2014.11.003 |issn=0150-9861 |pmid=25636991}}</ref> This is better for [[stroke]] diagnosis than other CT types.<ref name=":1" />