Contrast-Enhanced Ultrasound in Residual Tumor of Hepatocellular Carcinoma following Transarterial Chemoembolization: Is It Helpful for Tumor Response?

Table 2

Perfusion characteristics of the hepatocellular carcinomas on CEUS.

Perfusion	Number (%)	Mean±SD (sec)		p
Rise Time
group 1		16.1±2.7	1.38	0.09
group 2		15.1±3.5
Time to Peak
group 1		31.3±3.1	0.54	0.30
group 2		30.9± 3.2
Washout Time
group 1		191.0± 31.3	7.77	<0.01
<4min	16 (37.2%)
>4min	27 (62.8%)
group 2		142.6± 16.1
<4min	25 (83.3%)
>4min	5 (16.7%)
Arterial Phase (group 1/group 2)
Hyper-vascularity	38 (88.4%)/28 (93.3%)		0.502	0.479
Iso-vascularity	5 (11.6%)/2 (6.7%)
Portal Venous Phase (group 1/group 2)
Iso-enhanced	30 (69.8%)/5 (16.7%)		19.965	<0.01
Hypo-enhanced	13 (30.2%)/25 (83.3%)
Late phase (group 1/group 2)
Iso-enhanced	27 (62.8%)/5 (16.7%)		15.27	<0.01
Hypo-enhanced	16 (37.2%)/25 (83.3%)