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→Rectal: +Concentration
==Rectal==
===Projectional radiography and fluoroscopy===
;Choice of contrast medium
*'''Barium sulfate''' is generally used.
*An '''iodine'''-based contrast medium is used where there is a risk perforation, where barium may cause chemical inflammation.<<ref>{{cite web|url=https://radiopaedia.org/articles/ct-luminal-contrast|title=CT luminal contrast|author=Dr Vikas Shah ◉ and Dr Jeremy Jones|accessdate=2018-11-07|website=Radiopaedia}}</ref>
:However, 1-2% of oral iodine is absorbed in the gastrointestinal tract, and can potentially case a [[contrast medium reaction]].<ref>{{cite web|url=https://medicine.yale.edu/diagnosticradiology/patientcare/policies/oralcontrast.aspx|title=Oral Contrast Policies|website=Yale School of Medicine|accessdate=2018-11-07}}</ref> Also, it is more expensive than barium
;Iodine-based
Recommended concentration:
:Adults: 70 mg iodine per ml, such as 240 ml of a 370mg/ml solution in 1,000 mL of tap water.<ref name="iodine" group="notes">370mg/ml for undiluted gastrografin:
*{{cite web|url=http://www.bayerresources.com.au/resources/uploads/pi/file9348.pdf|title=AUSTRALIAN PRODUCT INFORMATION - GASTROGRAFIN (Sodium amidotrizoate / Amidotrizoate meglumine)|website=Bayer|accessdate=2018-11-07}}<
Dosages:
*{{cite web|url=https://www.drugs.com/dosage/gastrografin.html|title=Gastrografin Dosage|website=Drugs.com}}Medically reviewed on December 2, 2017.</ref>
:Children over 5 years: 55 mg iodine per ml such as 90 ml of a 370mg/ml solution in 500 mL tap water.<ref name="iodine" group="notes"/>
===[[CT scan]]s===
'''Rectally administered contrast''' is indicated in cases where a suspicion remains of penetrating trauma to the colon where an initial CT shows no reason for immediate surgery.<ref>{{cite web|url=http://www.radiologyassistant.nl/en/p466181ff61073/acute-abdomen-role-of-ct-in-trauma.html#i466184acd2fdb|title=Acute Abdomen - Role of CT in Trauma|author=Stephen Ledbetter and Robin Smithuis|website=Radiopaedia|date=2007-08-02}}</ref>
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