European Radiology

, Volume 21, Issue 2, pp 345–352

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

  • Hyun Kyong Lim
    • Department of RadiologySeoul National University Bundang Hospital
    • Institute of Radiation MedicineSeoul National University College of Medicine, Seoul National University Medical Research Center
    • Department of RadiologySeoul National University Bundang Hospital
    • Institute of Radiation MedicineSeoul National University College of Medicine, Seoul National University Medical Research Center
  • So Yeon Kim
    • Department of RadiologySeoul National University Bundang Hospital
    • Institute of Radiation MedicineSeoul National University College of Medicine, Seoul National University Medical Research Center
  • Kil Joong Kim
    • Department of Radiation Applied Life ScienceSeoul National University College of Medicine
  • Bohyoung Kim
    • School of Computer Science and EngineeringSeoul National University
  • Hyunna Lee
    • School of Computer Science and EngineeringSeoul National University
  • Seong Ho Park
    • Department of Radiology and Research Institute of Radiology, Asan Medical CenterUniversity of Ulsan College of Medicine
  • Jeffrey H. Yanof
    • Philips Healthcare, CT Clinical Science
  • Seung-sik Hwang
    • Department of Social & Preventive MedicineInha University School of Medicine
  • Young Hoon Kim
    • Department of RadiologySeoul National University Bundang Hospital
    • Institute of Radiation MedicineSeoul National University College of Medicine, Seoul National University Medical Research Center
Gastrointestinal

DOI: 10.1007/s00330-010-1922-4

Cite this article as:
Lim, H.K., Lee, K.H., Kim, S.Y. et al. Eur Radiol (2011) 21: 345. doi:10.1007/s00330-010-1922-4

Abstract

Objective

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.

Methods

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 (CTDIvol) 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 CTDIvol and the effect of ATT on image noise while adjusting for other variables including abdominal circumference.

Results

CTDIvol varied from 0.88 to 2.54 mGy. There was no significant correlation between CTDIvol and ATT (p = 0.61). ATT did not significantly affect CTDIvol (p = 0.93), while abdominal circumference was the only factor significantly affecting CTDIvol (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.

Conclusion

The amount of stool and fluid tagging does not significantly affect radiation exposure.

Keywords

CT colonographyRadiation doseTaggingAutomatic exposure control

Copyright information

© European Society of Radiology 2010