Changes

==Planning==

{{Pulmonary embolism - need for investigation and choice of modality}}

CT of pulmonary embolism needs to be done as a [[CT angiography]] in pulmonary arterial phase.

<br>The standard amount of contrast is generally 30 to 40g of iodine (such as 20-30 cc of 370 mg/ml of iodine).<ref>{{cite journal|url=https://www.massgeneral.org/imaging/news/radrounds/july_2015/|website=Radiology Rounds|title=Dual Energy CT Imaging for Suspected Pulmonary Embolism Using a Lower Dose of Contrast Agent|author=Janet Cochrane Miller, D. Phil., Author. Raul N. Uppot, M.D., Editor|volume=13|issue=7|journal=Radiology Rounds, by Massachusetts General Hospital, Department of Radiology}}</ref> In case of low renal function, dual energy CTA (such as 90/150SnkVp) is feasible even at iodine doses of 6g (such as 15 ml of 370 mg/ml of iodine).<ref name="LeroyerMeier2016">{{cite journal|last1=Leroyer|first1=Christophe|last2=Meier|first2=Andreas|last3=Higashigaito|first3=Kai|last4=Martini|first4=Katharina|last5=Wurnig|first5=Moritz|last6=Seifert|first6=Burkhardt|last7=Keller|first7=Dagmar|last8=Frauenfelder|first8=Thomas|last9=Alkadhi|first9=Hatem|title=Dual Energy CT Pulmonary Angiography with 6g Iodine—A Propensity Score-Matched Study|journal=PLOS ONE|volume=11|issue=12|year=2016|pages=e0167214|issn=1932-6203|doi=10.1371/journal.pone.0167214}}</ref>