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Radiation Protection Dosimetry 2005 114(1-3):313-316; doi:10.1093/rpd/nch568
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

A method of predicting the image noise in paediatric multi-slice computed tomography images

K. Ledenius1,*, M. Gustavsson2, S. Johansson2, F. Stålhammar2, J. Söderberg3, L. M. Wiklund2 and A. Thilander Klang3

1 Department of Radiation Physics, Sahlgrenska University Hospital, SE-413 45 Göteborg, Sweden
2 Department of Paediatric Radiology and Physiology, The Queen Silvia Children's Hospital, SE-416 85 Göteborg, Sweden
3 Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, SE-413 45 Göteborg, Sweden

* Corresponding author: kerstin.ledenius{at}vgregion.se

The purpose of this study was to develop an equation with which to determine the tube current to be used in order to obtain a certain image noise level for differently sized children undergoing multi-slice computed tomography examination. The relationship between image noise and detector dose for different examination protocols was established for a LightSpeed Ultra, an eight slice CT from GEMS, using homogeneous water phantoms of different sizes. Three different anatomical areas (head, thorax and abdomen) were studied in 111 patients between 0 and 17 y of age. The mean ratio between the calculated and the measured noise in patient images was established for the different areas. Head examinations showed the best correlation (measured-to-calculated noise ratio = 1.01). In the thorax, the calculated noise was generally higher than the measured noise (ratio = 0.74), and in the abdomen, the opposite result was found (ratio = 1.20).


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K LEDENIUS, M GUSTAVSSON, S JOHANSSON, F STALHAMMAR, L-M WIKLUND, and A Thilander-KLANG
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