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Dose Reduction and Image Quality in MDCT Colonography Using Tube Current Modulation

A. Graser1, B. J. Wintersperger1, C. Suess2, M. F. Reiser1 and C. R. Becker1

1 Department of Clinical Radiology, University of Munich, Grosshadern Campus, Marchioninistr. 15, Munich 81377, Germany.
2 CT Division, Siemens Medical Solutions, Forchheim, Germany.


Figure 1
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  		Fig. 1A —64-year-old man undergoing CT colonography screening for colorectal cancer. Circular regions of interest in colonic lumen at level of portal vein (A) and renal hilum (B), cephalad to iliac crest (C), and cephalad to acetabulum (D). Size of ROIs has been adjusted to diameter of bowel lumen. Numbers show area of ROI and mean and SD of attenuation in lumen.

 

Figure 2
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  		Fig. 1B —64-year-old man undergoing CT colonography screening for colorectal cancer. Circular regions of interest in colonic lumen at level of portal vein (A) and renal hilum (B), cephalad to iliac crest (C), and cephalad to acetabulum (D). Size of ROIs has been adjusted to diameter of bowel lumen. Numbers show area of ROI and mean and SD of attenuation in lumen.

 

Figure 3
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  		Fig. 1C —64-year-old man undergoing CT colonography screening for colorectal cancer. Circular regions of interest in colonic lumen at level of portal vein (A) and renal hilum (B), cephalad to iliac crest (C), and cephalad to acetabulum (D). Size of ROIs has been adjusted to diameter of bowel lumen. Numbers show area of ROI and mean and SD of attenuation in lumen.

 

Figure 4
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  		Fig. 1D —64-year-old man undergoing CT colonography screening for colorectal cancer. Circular regions of interest in colonic lumen at level of portal vein (A) and renal hilum (B), cephalad to iliac crest (C), and cephalad to acetabulum (D). Size of ROIs has been adjusted to diameter of bowel lumen. Numbers show area of ROI and mean and SD of attenuation in lumen.

 

Figure 5
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  		Fig. 2A —Graphs show image noise for anatomic levels I-IV with different tube current modulation techniques. Level I is at portal vein; level II, at renal hilum; level III, cephalad to iliac crest; and level IV, in pelvis cephalad to acetabulum. Boxes include mean ± SD, and whiskers indicate 95% CIs. Random x's indicate outliers. Tube current of 120 mAs without z-axis tube current modulation.

 

Figure 6
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  		Fig. 2B —Graphs show image noise for anatomic levels I-IV with different tube current modulation techniques. Level I is at portal vein; level II, at renal hilum; level III, cephalad to iliac crest; and level IV, in pelvis cephalad to acetabulum. Boxes include mean ± SD, and whiskers indicate 95% CIs. Random x's indicate outliers. Tube current of 120 reference mAs with z-axis tube current modulation.

 

Figure 7
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  		Fig. 2C —Graphs show image noise for anatomic levels I-IV with different tube current modulation techniques. Level I is at portal vein; level II, at renal hilum; level III, cephalad to iliac crest; and level IV, in pelvis cephalad to acetabulum. Boxes include mean ± SD, and whiskers indicate 95% CIs. Random x's indicate outliers. Tube current of 40 mAs without z-axis tube current modulation.

 

Figure 8
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  		Fig. 2D —Graphs show image noise for anatomic levels I-IV with different tube current modulation techniques. Level I is at portal vein; level II, at renal hilum; level III, cephalad to iliac crest; and level IV, in pelvis cephalad to acetabulum. Boxes include mean ± SD, and whiskers indicate 95% CIs. Random x's indicate outliers. Tube current of 40 reference mAs with z-axis tube current modulation.

 

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