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Intraportal Venous Flow Distribution

Evaluation with Single Breath-Hold ECG-Triggered Three-Dimensional Half-Fourier Fast Spin-Echo MR Imaging and a Selective Inversion-Recovery Tagging Pulse

Katsuyoshi Ito1, Shinji Koike1, Chisaki Jo2, Ayame Shimizu1, Hitoshi Kanazawa2, Mitsue Miyazaki2, Shuichi Yamauchi1 and Naofumi Matsunaga1

1 Department of Radiology, Yamaguchi University School of Medicine, 1-1-1 Minami Kogushi, Ube, Yamaguchi 755-8505, Japan.
2 Toshiba Medical Engineering Center, 1385 Shimoishigami, Otawara, Tochigi 324-8550, Japan.



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  		Fig. 1A. —39-year-old healthy man who underwent unenhanced MR angiography of portal venous system performed with regular breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence with no tagging pulse. Placement of selective inversion-recovery tagging pulse on maximum-intensity-projection image was obtained with regular three-dimensional fast spin-echo sequence. Selective inversion-recovery tagging pulse (TAG-A) is placed on superior mesenteric vein to suppress inflow blood signal into portal vein.

 


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  		Fig. 1B. —39-year-old healthy man who underwent unenhanced MR angiography of portal venous system performed with regular breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence with no tagging pulse. Placement of selective inversion-recovery tagging pulse on maximum-intensity-projection image was obtained with regular three-dimensional fast spin-echo sequence. Selective inversion-recovery tagging pulse (TAG-B) is placed on splenic vein to suppress inflow blood signal into portal vein.

 


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  		Fig. 1C. —39-year-old healthy man who underwent unenhanced MR angiography of portal venous system performed with regular breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence with no tagging pulse. Placement of selective inversion-recovery tagging pulse on maximum-intensity-projection image was obtained with regular three-dimensional fast spin-echo sequence. Selective inversion-recovery tagging pulse (TAG-C) is placed on both superior mesenteric and splenic veins to suppress inflow blood signal into portal vein.

 


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  		Fig. 2A. —39-year-old healthy man who underwent unenhanced MR angiography of portal venous system performed with regular breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence with no tagging pulse (same subject as in Fig. 1A,1B,1C). Maximum-intensity-projection image shows main portal vein, first-order intrahepatic portal veins, superior mesenteric vein, and splenic vein with high signal intensity.

 


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  		Fig. 2B. —39-year-old healthy man who underwent unenhanced MR angiography of portal venous system performed with regular breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence with no tagging pulse (same subject as in Fig. 1A,1B,1C). Source image shows right portal vein and main portal vein.

 


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  		Fig. 3A. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-A) to suppress signal flow from superior mesenteric vein into portal vein (same subject as Fig. 1A,1B,1C). Maximum-intensity-projection image shows signal reduction (arrows) on right half of main portal vein. Compare with Figure 2A.

 


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  		Fig. 3B. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-A) to suppress signal flow from superior mesenteric vein into portal vein (same subject as Fig. 1A,1B,1C). On source image, signal loss (arrows) is clearly observed on right half of main portal and right portal veins. Compare with Figure 2B.

 


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  		Fig. 4A. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-B) to suppress signal flow from splenic vein into portal vein (same subject as in Fig. 1A,1B,1C). Maximum-intensity-projection image shows signal reduction (arrows) on left half of main portal vein. Compare with Figure 2A.

 


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  		Fig. 4B. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-B) to suppress signal flow from splenic vein into portal vein (same subject as in Fig. 1A,1B,1C). On source image, signal loss (arrows) is clearly observed on left half of main portal and right portal veins. Compare with Figure 2B.

 


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  		Fig. 5A. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-C) to suppress signal flow from both superior mesenteric and splenic veins into portal vein (same subject as in Fig. 1A,1B,1C). Maximum-intensity-projection image shows entire signal reduction (arrow) in main portal vein. Compare with Figure 2A.

 


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  		Fig. 5B. —39-year-old healthy man who underwent unenhanced MR angiography performed with breath-hold ECG-triggered three-dimensional half-Fourier fast spin-echo sequence using selective inversion-recovery tagging pulse (TAG-C) to suppress signal flow from both superior mesenteric and splenic veins into portal vein (same subject as in Fig. 1A,1B,1C). On source image, entire signal loss (arrows) is clearly observed in main portal and right portal veins. Compare with Figure 2B.

 

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