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Comparison Between One-Route and Two-Route Injection for Liver and Aortic Enhancement Using MDCT

Masahiro Okada1, Takamichi Murakami1, Seishi Kumano1, Izumi Imaoka1, Taro Shimono1, Ryuichiro Ashikaga1 and Makoto Hosono1

1 Department of Radiology, Kinki University School of Medicine, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka 589-8511, Japan.


Figure 1
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  		Fig. 1 —Graph shows time-density curve using bolus-tracking system (arrival time to abdominal aorta). Time taken (from initiation of injection of contrast medium) for abdominal aorta to show enhancement greater than 100 H from baseline attenuation was 18 seconds (arrival time) in this group B (two-route technique) patient.

 

Figure 2
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  		Fig. 2 —Graph shows time-density curve using bolus-tracking system (gradient of curves of first increase). Enhancement of 150 H from baseline with rise time of 6 seconds was seen in this group B (two-route technique) patient. Thus gradient of curve was 150/6 = 25 H/s.

 

Figure 3
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  		Fig. 3 —Scattergram shows time to reach trigger threshold for group A (one-route technique). Arrival time of contrast medium to abdominal aorta is shown. Aortic arrival times ranged from 10 to 23 seconds in group A.

 

Figure 4
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  		Fig. 4 —Scattergram shows time to reach trigger threshold for group B (two-route technique). Arrival time of contrast medium to abdominal aorta is shown. Aortic arrival time ranged from 16 to 28 seconds in group B.

 

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