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Contrast enhancement in the portal vein was repeatedly observed at 1 min intervals with wide-band Doppler ultrasonography in 152 consecutive patients (132 with liver cirrhosis and HCC, 20 controls), 5 min after the injection of Levovist. The duration time of contrast enhancement in the portal vein (microbubble disappearance-time; MD-T) was measured in all patients and contrast-enhanced appearances...
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