Polyp Faecal tagging

Several studies using a preparation based on faecal tagging have been performed. The results of polyp detection of these studies are listed in Table 4.1. 

Last but not least, Pickhardt et al. (2003) obtained tbe best results of polyp detection to date with virtual colonoscopy in a large cohort of 1233 asymptomatic patients. The day before CT colonography they combined a clear liquid diet with a double dose of oral sodium phosphate and two bisacodyl tablets. Faecal tagging was performed with 2x250 ml of a 2.1% w/v barium suspension and 60 ml of Gas-trografin. Excellent results of polyp detection were obtained. 

Iannaccone et al. (2004) examined successfully 203 patients with laxative-free CT colonography. They performed faecal tagging over two days with a total of 200 ml of diatrizoate meglumine and diatrizoate sodium. The patients were also on a low residue diet for two days. They obtained very good results of polyp detection 86% for lesions >6 mm (79 lesions), 95.5% for lesions >8 mm (45 lesions), 100% for lesions >1 cm (24 lesions). 

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