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16-MDCT Aortography with a Low-Dose Contrast Material Protocol

Daisuke Utsunomiya1,2, Kazuo Awai3, Yoshitaka Tamura2, Taiji Nishiharu1, Joji Urata1, Takashi Sakamoto1, Akira Taniguchi4 and Yasuyuki Yamashita2

1 Diagnostic Imaging Center, Saiseikai Kumamoto Hospital, 5-3-1 Chikami, Kumamoto-shi, Kumamoto 861-4193, Japan.
2 Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-0811, Japan.
3 Diagnostic Image Analysis, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-0811, Japan.
4 CT Systems Division, Toshiba Medical Systems, Tokyo 113-8456, Japan.


Figure 1
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  		Fig. 1 —Graph shows mean attenuation along z-axis and SD for 100-mL protocol (• and solid line) and 50-mL protocol ({square} and dotted line). Aortoiliac enhancement profile with 100-mL protocol shows more constant level, but there was no significant difference. ROI = region of interest.

 

Figure 2
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  		Fig. 2 —Scattergram shows relationship between body weight and mean aortoiliac attenuation values for 100-mL protocol (group 1). There was no significant correlation (R = -0.284, p = 0.19).

 

Figure 3
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  		Fig. 3 —Scattergram shows relationship between body weight and mean aortoiliac attenuation values for 50-mL protocol (group 2). There was significant negative correlation (R = -0.692, p = 0.0002).

 

Figure 4
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  		Fig. 4A —61-year-old man with abdominal aortic aneurysm. Anterior volume-rendered CT angiogram (A) and maximum-intensity-projection image (B) obtained with 50-mL protocol show good delineation of entire aorta and aortic branches. These images also show drop of arterial enhancement in distal iliac vasculature. Mean aortoiliac attenuation was 309 H, and difference between maximum and minimum attenuation values along z-axis was 76 H. Attenuation of each region of interest (ROI) was 326, 326, 322, 321, 310, 313, 246 H, respectively, for ROIs 1, 2, 3, 4, 5, 6, and 7.

 

Figure 5
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  		Fig. 4B —61-year-old man with abdominal aortic aneurysm. Anterior volume-rendered CT angiogram (A) and maximum-intensity-projection image (B) obtained with 50-mL protocol show good delineation of entire aorta and aortic branches. These images also show drop of arterial enhancement in distal iliac vasculature. Mean aortoiliac attenuation was 309 H, and difference between maximum and minimum attenuation values along z-axis was 76 H. Attenuation of each region of interest (ROI) was 326, 326, 322, 321, 310, 313, 246 H, respectively, for ROIs 1, 2, 3, 4, 5, 6, and 7.

 

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