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超声医学总论 授课教师 王志刚 PowerPoint PPT Presentation


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超声医学总论 授课教师 王志刚. 第 一 节 诊断超声的物理特性. 超声诊断是指运用超声波原理对人体组织的物理特性、形态结构与运动功能状态做出判断的一种非创伤性检查方法。. 一、 概 论 (一)超声波定义 声源振动频率 〉2 万赫兹( Hz )的机械波为超声波。 超声诊断所用声源振动频率一般为: 1-10 兆赫( MHz ),常用为: 2.5-5.0 MHz 。. (二)超声波的主要物理量 1 、波长( λ ) 在波的传播方向上,质点完成一次振动的距离,单位是 mm 。 2 、周期 (T) 质点完成一次振动的时间。.

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超声医学总论 授课教师 王志刚

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2Hz1-10MHz2.5-5.0 MHz


1 mm2(T)


3f Hz


4C , m/s1540m/s



1


2


3


411 3-3.5MHz1mm


3


2


P g/cm3


2


C m/s


Z g/cm2.s









Doppler effect


1842..



fd =2fo(V.cosc) fd:fo:V::c:


fo:c1540m/s










ABM


HIFU








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