How is CT colonography (CTC) performed?

Colonic Cleansing

• Dry Prep
  • 10 oz Mg Citrate
  • 45 ml Na Phosphate-contraindicated in pts with renal or cardiac failure
• Wet Prep
  • 4 liters Polyethylene Glycol

+

5 mg Bisacodyl tabs + suppository 

Colonic Distention 

• CO2 insufflation
  • High lipid solubility
  • High partial pressure gradient electronic, preset P= 25 mm HG