1) echo reduction
回声降低
1.
This paper gives mathematic relations of parameters between pressure reflaction coefficient, absorption coefficient, echo reduction and target strength.
本文探讨了吸声材料的声压反射系数、吸声系数、回声降低(ER)与目标强度变化(△TS)等参数之间的解析关系。
3) noise reduction
噪声降低
1.
The effects of noise on chaotic time series analysis were introduced and the previous studies associated with the noise reduction in chaotic time series data were reviewed as well.
介绍了噪声对混沌时序分析的影响，回顾了混沌时序噪声降低方法的研究情况。
4) hiss reduction
降低嘶声
5) hypoechoic focal lesions
低回声灶
6) Hypoechogenicity
低回声
1.
Clinical Value of Thyroid Hypoechogenicity in Patients with Postpartum Thyroiditis;
超声低回声在产后甲状腺炎中的临床意义
补充资料：边界回声
边界回声
boundary echo
器官、组织或病灶的边界处回声。可观察被膜(包膜）有无、厚薄、钙化等，有无粘连，边缘是否光滑、规则或清晰等。观察边界回声对疾病诊断具有重要价值，尤其对鉴别良性和恶性肿瘤作用更显著。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条