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. Author manuscript; available in PMC: 2014 Jan 1.

Published in final edited form as: Radiol Clin North Am. 2013 Jan;51(1):69–88. doi: 10.1016/j.rcl.2012.09.005

3D endoluminal CTC image (A) from ultra-low-dose scan (0.3 mSv) reconstructed with traditional filtered back projection (FBP) technique shows significant image noise. The rectal catheter is visible but the rectal polyp is largely obscured. When the same CT image data are reconstructed with a newer iterative reconstruction algorithm (B), the polyp (arrow) becomes much more conspicuous.

3D endoluminal CTC image (A) from ultra-low-dose scan (0.3 mSv) reconstructed with traditional filtered back projection (FBP) technique shows significant image noise. The rectal catheter is visible but the rectal polyp is largely obscured. When the same CT image data are reconstructed with a newer iterative reconstruction algorithm (B), the polyp (arrow) becomes much more conspicuous.