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- Title
Does the amount of tagged stool and fluid significantly affect the radiation exposure in low-dose CT colonography performed with an automatic exposure control?
- Authors
Lim HK; Lee KH; Kim SY; Kim KJ; Kim B; Lee H; Park SH; Yanof JH; Hwang SS; Kim YH; Lim, Hyun Kyong; Lee, Kyoung Ho; Kim, So Yeon; Kim, Kil Joong; Kim, Bohyoung; Lee, Hyunna; Park, Seong Ho; Yanof, Jeffrey H; Hwang, Seung-Sik; Kim, Young Hoon
- Abstract
<bold>Objective: </bold>To determine whether the amount of tagged stool and fluid significantly affects the radiation exposure in low-dose screening CT colonography performed with an automatic tube-current modulation technique.<bold>Methods: </bold>The study included 311 patients. The tagging agent was barium (n = 271) or iodine (n = 40). Correlation was measured between mean volume CT dose index (CTDI (vol)) and the estimated x-ray attenuation of the tagged stool and fluid (ATT). Multiple linear regression analyses were performed to determine the effect of ATT on CTDI (vol ) and the effect of ATT on image noise while adjusting for other variables including abdominal circumference.<bold>Results: </bold>CTDI (vol) varied from 0.88 to 2.54 mGy. There was no significant correlation between CTDI (vol) and ATT (p = 0.61). ATT did not significantly affect CTDI (vol) (p = 0.93), while abdominal circumference was the only factor significantly affecting CTDI (vol) (p < 0.001). Image noise ranged from 59.5 to 64.1 HU. The p value for the regression model explaining the noise was 0.38.<bold>Conclusion: </bold>The amount of stool and fluid tagging does not significantly affect radiation exposure.
- Publication
European Radiology, 2011, Vol 21, Issue 2, p345
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-010-1922-4