117.67±7.39
-25.47±6.83
t2
148.80±9.44
105.47±18.79
-29.46±8.62
t3
148.13±5.75
99.00±5.74
-33.20±1.40
t4
153.17±6.11
85.57±7.21
-44.19±2.79
F= frequency; I=ultrasound energy; T=exposure time; f1=3.5 MHz; f2=7.5 MHz; e1=0.11 mW; e2=0.46 mW; t1=30 s; t2=60 s; t3=120 s; t4=240 s
表2超声频率、时间及强度各自对造影剂微泡浓度及大小的影响(单位:%)
Tab. 2 Influences of ultrasound frequency, intensity or exposure time on concentration and size of microbubbles respectively
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