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Optimization of scanning parameters for CT colonography

N P Power, MRCPI, FRCR 1 M D Pryor, MSc 2 A Martin, DCR, PgDip 1 J Horrocks, MSc, PhD 2 A M McLean, FRCP, FRCR 1 and R H Reznek, FRCP, FRCR 1

Departments of 1 Radiology and 2 Clinical Physics, St. Bartholomew's Hospital, West Smithfield, London EC1A 7EB, UK



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  		Figure 1. Anthropomorphic phantom with polyps along the inner colonic wall on (a) lung windows and (b) soft tissue windows.

 


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  		Figure 2. Polynomial fit through attenuation value data set.

 


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  		Figure 3. Relative contrast and relative dose (–{circ}–) vs scan parameters for 5 mm polyp (–{diamond}–).

 


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  		Figure 4. Relative contrast and relative dose (–{circ}–) vs scanparameters for 4 mm (–{triangleup}–), 5 mm (–{diamond}–) and6 mm (–{square}–) polyps.

 


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  		Figure 5. Conspicuity score and relative dose (–{circ}–) vs scanparameters for 4 mm (–{triangleup}–), 5 mm (–{diamond}–)and6 mm (–{square}–) polyps.

 




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