相关-1us technique课程1超声基本原理和键盘知识

课程1：超声基本原理和“键盘知识UltrasoundcourseShanghaiDVM,DiplECVDI WhoamI?我是谁Physicalpropertiesofsoundwavesandhowthey X-线或超声X-线或超声X-线或超声以前胃肠道问题：造影检wave波tissuesthatreflectsoundwaves99%ofthetimesoundwavesare yY

XB-模式=亮度模式ReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefractionReflectionScatterRefraction tissueer:声阻 组织Thepercentofsoundreflectionofareflectivesurfaceisdirectlyproportionaltothemagnitudeofthedifferenceinacousticimpedance'softhetissuesataninterface!eanatomicaloverview大界面=“镜面反射器提供解角度必须是垂直Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Reflection反射丢Scatter散射丢Refractionloss折射丢Increasefrequency=IncreasedattenuationDecreased highhigh 高频 深度 lowfrequencylowerinresolution低频 低分辨 !!!!Selecthighestfrequencytransducerthatwillallowsufficientpenetrationtoimageorganofinterest! 线凸微线凸微高低无 …ishyper/hypowithreferencetoPower/Intensity/OutputControl-Somescannershaveaknoblabeledpower,intensityoroutput.Thiscontrolsthepowerorintensityofthesoundbeamproducedbythetransducers.Itisbasicallylikeavolumecontrolonaspeaker.Mostofthetimet