Faecal tagging means labelling of faecal residue in the colon. Stool tagging refers to labelling of residual stool, while fluid tagging refers to labelling of residual fluid. The technique is based on the oral ingestion of positive contrast material (barium and/ or iodine) as part of the preparation prior to CT colonography. The orally ingested contrast material impregnates the residual stool and mixes with the residual fluid in the colon. By doing so the residual stool and fluid, remaining in the colon after the preparation, have a hyperdense or white aspect on the two-dimensional CT images.
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