【摘要】 根据对超声多普勒血流物理模型的研究,提出了一套自己的物理模型,用超声探头采集出多普勒信号,然后再利用一些较为经典的方法,如短时傅立叶变换对其进行处理,然后得到其时频分布图.从这些分析结果中得到了一些有用的信息:一个脉动周期内的能量的分布是与液体流动的速度相关联的;一个脉动周期内的频偏也是与液体流动的速度相关联.更多还原

【Abstract】 Based on the previous study on the flow phantom,the scheme of designing the flow phantom is introduced,which includes selecting the pump,molding the tissue-mimic,and making the blood-mimic.After putting this component together,the Doppler signal can be collected from this flow phantom by the ultrasound sensor.Then,its time-frequency figure can be obtained using the conventional algorithm,the STFT (Short Time Fourier Transform),to process it.From the calculating results based on the algorithms above,some useful information can be got:firstly,the power spectrum distribution is related to the flow speed in one pulsatile flow cycle;secondly,the frequency offset is also related to the flow speed.更多还原