Table 2.

Comparison of peak intensity in the normal and targeted contrast ultrasound examinations ($\overline{x}$ ± s, dB).

Group	1 week	2 weeks	3 weeks	4 weeks	5 weeks	6 weeks	7 weeks
Normal	54.17 ± 4.35	56.18 ± 5.66	57.28 ± 5.15	58.75 ± 6.57	59.27 ± 3.44	58.48 ± 3.38	57.40 ± 2.11
Targeted	70.57 ± 2.94	71.33 ± 3.03	73.94 ± 4.07	75.45 ± 3.76	77.66 ± 2.64	74.03 ± 5.43	72.27 ± 4.29
t value	7.323	5.833	6.415	4.022	2.284	3.139	6.733
P	＜0.05	＜0.05	＜0.05	＜0.05	＜0.05	＜0.05	＜0.05