In this research, we use chirp excitation, which is one of coded waveforms as an attempt to improve CTR by increasing pulse length and maintain the axial resolution by received pulse compression.

• 本研究将进一步应用编码波形中的高斯啾声脉冲在脉冲反相基频影像上，以拉长脉冲的方式取代提升脉冲峰值来增加脉冲能量，可提升影像之讯杂比且避免破坏气泡与组织，然后利用压缩滤波器压缩回波讯号，恢复因脉冲拉长而下降之轴向解析度。