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First published online July 9, 2007
British Journal of Radiology (2007) 80, 631-638
© 2007 British Institute of Radiology
doi: 10.1259/bjr/31771954
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Investigation into the effects of lead shielding for fetal dose reduction in CT pulmonary angiography

E V Kennedy, BSc 1 G R Iball, MSc, BSc 2 and D S Brettle, PhD, MSc, BSc 2

1 Academic Unit of Medical Physics, University of Leeds, 2 Department of Medical Physics and Engineering, Leeds Teaching Hospitals NHS Trust, Leeds General Infirmary, Leeds LS1 3EX, UK


Figure 1
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  		Figure 1. (a) Experimental set-up of the Rando phantom with Perspex slice and water balloons. (b) Perspex replacement slice.

 

Figure 2
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  		Figure 2. Scan projection radiographs showing the position of the ionization chambers and the lead shielding.

 

Figure 3
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  		Figure 3. Percentage reduction in dose with 0.7 mm lead for varying kVp. Each value has an error of 1%.

 

Figure 4
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  		Figure 4. Percentage dose reduction with 0.7 mm lead as helical pitch is varied. Each value has an error of 1%.

 

Figure 5
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  		Figure 5. The variation in fetal dose as lead is moved along the body. Each value has an error of 1%.

 

Figure 6
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  		Figure 6. The variation in fetal dose with the distance of the scan edge from the uterus. Each value has an error of 1%.

 

Figure 7
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  		Figure 7. The variation in fetal dose with lead thickness for four different values of kVp. Each value has an error of 1%. Extra data points are shown for 100 kVp.

 




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