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A method for the systematic selection of technique factors in paediatric CT

Regional Medical Physics Department, Newcastle General Hospital, Newcastle-upon-Tyne NE4 6BE, UK

View larger version (13K): [in a new window]   Figure 1. Experimentally measured mean noise level plotted against phantom age for abdomen examinations at 120 kVp, 12 mm Aluminium. Error bars of ±2 standard errors on the mean calculated for each point are shown together with the best fit line of zero gradient.

View larger version (19K): [in a new window]   Figure 2. Fraction of adult mAs–slice width product per slice required for a paediatric abdomen CT image with the same noise level plotted against phantom age, using the standard dimensions from Table 2. The curves are spline fits to points for 80 kV, 100 kV, 120 kV and 140 kV at ages neonate, 1 year, 5 years, 10 years and 15 years, and adult placed at age 30 years.