<a href="https://en.wikipedia.org/wiki/Virtual_colonoscopy" class="extiw" title="en:Virtual colonoscopy">CT colonography</a> of a rectal mass. Left image is a <a href="https://en.wikipedia.org/wiki/Volume_rendering" class="extiw" title="en:Volume rendering">volume rendering</a> and right image is a thin slice. It also shows the rectal tube used for insufflation of gas to distend the colon.
<p>Original caption: Differentiation from stool and colonic neoplasia by dual-energy CT. Male, 88 years of age. (A,B) denote colonography and CT axial plane image revealed irregular upheaval masses in the posterior wall of the rectum (white arrow). It is difficult to differentiate tumors from stool. 
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<br>Dual-energy contrast-enhanced CT (axial plane) revealed no enhancement of masses, iodine value = −1.4 mg/ml (white arrow), suggesting no blood supply to the masses, which was validated as stool by colonography.
Kai Sun, Ruijuan Han, Yang Han, Xuesen Shi, Jiang Hu &amp; Bin lu
CC BY 4.0
<p><cite style="font-style:normal"> (2018). "Accuracy of Combined Computed Tomography Colonography and Dual Energy Iiodine Map Imaging for Detecting Colorectal masses using High-pitch Dual-source CT". <i>Scientific Reports</i> <b>8</b> (1). <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038/s41598-018-22188-x">10.1038/s41598-018-22188-x</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/2045-2322">2045-2322</a>.</cite>
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<ul><li>Creative Commons Attribution 4.0 International License</li></ul>