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British Journal of Radiology (2007) 80, 657-667
© 2007 British Institute of Radiology
doi: 10.1259/bjr/97260522
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Comparative evaluation of organ and effective doses for paediatric patients with those for adults in chest and abdominal CT examinations

K Fujii, MSc T Aoyama, PhD S Koyama, PhD and C Kawaura, PhD

Graduate School of Medicine, Nagoya University, Daikominami, Higashi-ku, Nagoya, Japan


Figure 1
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  		Figure 1. Silicon spherical photodiode, Kyosemi KSPD1840C2, used as the X-ray sensor of the in-phantom dosemeter, and the angular response of the dosemeter for longitudinal direction measured through a single rotation of the X-ray beam of the CT scanner. Incident angle of the X-ray beam is shown.

 

Figure 2
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  		Figure 2. X-ray energy dependence of dosemeter sensitivity.

 

Figure 3
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  		Figure 3. An adult phantom(left) and a paediatric phantom (right) manufactured by Kyoto Kagaku, Japan.

 

Figure 4
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  		Figure 4. Three-dimensional CT image of the paediatric phantom indicating the location of the 32 photodiode dosemeters (short bars) distributed in the phantom.

 

Figure 5
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  		Figure 5. Effective dose as a function of effective mAs in chest CT examinations, where effective doses were obtained with both paediatric and adult CT scans. Linear regression lines through the origin were calculated from dose values obtained with Toshiba CT scanners(dashed line) and with Siemens CT scanners (solid line) separately.

 

Figure 6
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  		Figure 6. Effective dose as a function of effective mAs in abdominal CT examinations, where effective doses were obtained with both paediatric and adult CT scans. Linear regression lines through the origin were calculated from dose values obtained with Toshiba CT scanners(dashed line) and with Siemens CT scanners (solid line) separately.

 




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