Does the amount of tagged stool and fluid significantly affect the radiation exposure in low-dose CT colonography performed with an automatic exposure control?
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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.
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.
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.
The amount of stool and fluid tagging does not significantly affect radiation exposure.
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- Does the amount of tagged stool and fluid significantly affect the radiation exposure in low-dose CT colonography performed with an automatic exposure control?
Volume 21, Issue 2 , pp 345-352
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- CT colonography
- Radiation dose
- Automatic exposure control
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- Author Affiliations
- 1. Department of Radiology, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707, Korea
- 2. Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul National University Medical Research Center, Bundang, Korea
- 3. Department of Radiation Applied Life Science, Seoul National University College of Medicine, Seoul, Korea
- 4. School of Computer Science and Engineering, Seoul National University, Seoul, Korea
- 5. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
- 6. Philips Healthcare, CT Clinical Science, Cleveland, OH, USA
- 7. Department of Social & Preventive Medicine, Inha University School of Medicine, Incheon, Korea