Editing Intravenous therapy (section)

====Imaging====
{{main|Contrast agent}}
Medical imaging relies on being able to clearly distinguish internal parts of the body from each other. One way this is accomplished is through the administration of a [[contrast agent]] into a vein.<ref>{{cite journal |last1=Runge |first1=VM |last2=Ai |first2=T |last3=Hao |first3=D |last4=Hu |first4=X |title=The developmental history of the gadolinium chelates as intravenous contrast media for magnetic resonance. |journal=Investigative Radiology |date=December 2011 |volume=46 |issue=12 |pages=807–16 |doi=10.1097/RLI.0b013e318237913b |pmid=22094366|s2cid=8425664 }}</ref> The specific imaging technique being employed will determine the characteristics of an appropriate contrast agent to increase visibility of blood vessels or other features. Common contrast agents are administered into a peripheral vein from which they are distributed throughout the circulation to the imaging site.<ref>{{cite journal |last1=Rawson |first1=JV |last2=Pelletier |first2=AL |title=When to Order a Contrast-Enhanced CT. |journal=American Family Physician |date=1 September 2013 |volume=88 |issue=5 |pages=312–6 |pmid=24010394}}</ref>