乳腺癌是女性常见肿瘤,早期、及时诊断有助于治疗及预后.超声作为乳腺常规检查方法意义重大,超微血管成像技术(SMI)是近年出现的超声血流成像新技术,其采用自适应算法来区分微细血流及正常组织自身运动产生的频谱信号,可更真实地显示低速血流信息;并已应用于乳腺、甲状腺及肝脏等领域,具有一定的临床价值.本文就SMI技术的原理及其在诊断乳腺疾病中的应用进展进行综述.“,”Breast cancer is a common tumor in women.Early and timely diagnosis is crucial for treatment and prognosis.As a routine method of breast examination,ultrasonography plays an important role in diagnosis of breast diseases.Superb microvascular imaging (SMI) is a new ultrasonic blood flow imaging technique in recent years,which separates spectrum signals of low-speed flow from normal tissue motion by an adaptive algorithm.SMI can display the slow-speed flow more realistically,and has been used on breast,thyroid,liver and so on.SMI is obviously valuable in clinic.The principle and application progresses of SMI in diagnosis of breast diseases were reviewed in this article.