③ 环征（ring sign）:亦称声晕，即癌周边一清晰光滑的无回声环，当肿瘤直径超过3cm时，声环常伴侧壁声影，这些改变与包膜型HCC特有的纤维包膜密切相关...
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靶环征 target sign
开环征 open-ring sign
光环征 halo sign
晕环征 Halo sign
幽门管横断面为靶环征 targt sign
环境特征 Environment Characteristic ; environmental features ; Characteristic of the environment ; environmental distinction
双绒毛环征 double decidual sac sign
不必检查循环征象 signs of circulation
环流特征 circumfluence character ; hpa circulation feature
“双环征”是甲状腺脓肿的特征性表现；
Double circle enhanced is the characteristic of thyroid abscess;
肠套叠的类型以回结型最多，油炸面圈征或靶环征是肠套叠的特征性超声表现；
The most popular type of intussusceptions is circle-linked. The ultrasound exam shows the characteristics of doughnut or target loop.
结果9例肠扭转诊断均正确，主要征象有肠管的“漩涡征”(6例)和血管的“漩涡征”(9例)、“靶环征”(2例)、“鸟喙征”(6例)。
Results All the 9 cases were diagnosed accurately, the main signs were "whirlpool" of intestine (6 cases) and vessels (9 cases), "target loop" (2 ca ses), "beak" (6 cases).
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