Role of multiphase scans by multirow-detector helical CT in detecting small hepatocellular carcinoma

Table 1 Mean attenuation difference of tumor-to-liver in all phases

Scanning phases	No of SHCCs	X ± SD
Noncontrast	71	15.75 ± 7.0a
Early arterial phase	71	11.0 ± 9.4a
Late arterial phase	71	20.2 ± 14.7a
Portal venous phase	71	18.0 ± 10.68

Note: The mean attenuation difference value of each phase was an absolute value.

^aP < 0.05.

Table 2 Sensitivity of SHCC detection for each scanning phase

Scanning phases	Sensitivity (%) (n = 91)
EAP	45.1 (41/91)
LAP	83.5 (76/91)
DAP	92.3 (84/91)
PVP	78.0 (71/91)
EAP + PVP	84.6 (77/91)
LAP + PVP	94.5 (86/91)
EAP + LAP + PVP	97.8 (89/91)

Table 3 Comparison of X² value between each scanning phase

Scanning phases	LAP	ELAP	PVP	EAP + PVP	LAP + PVP	EAP + LAP + PVP
EAP	P < 0.001a	P < 0.0018	P < 0.001a	P < 0.001a	P < 0.001a	P < 0.001a
LAP		P = 0.088	P = 0.258	P = 0.831	P = 0.033a	P = 0.006a
ELAP			P = 0.088	P = 0.135	P = 0.669	P = 0.285
PVP				P = 0.200	P < 0.001a	P < 0.001a
EAP + PVP					P = 0.053	P = 0.010a
LAP + PVP						P = 0.521

Note: All data represented the comparison between each scanning phase using McNemar Test.

^aP < 0.05 was considered significant.