摘要
混频相控阵作为超声相控阵中的一种新方法,在声场聚焦和偏转都有突出表现。文中对其在聚焦过程中的聚焦特征及相关因素与常规同频相控进行对比分析,得出混频相控阵有利于提高焦区的声能密度,信噪比和轴向分辨率;同时给出了如何优化选择阵列各阵元相应的激发频率。这对改善超声诊断的成像质量和提高聚焦治疗的能量密度等有重要意义。
Mixing frequency Phased Array（MPA） is a new approach extended from traditional ultrasound phased array. We discussed the contrast, spatial resolution and other characteristics of MPA focusing after giving algorithm for global optimization of MPA＇s frequency and phase. With simulation the distribution of MPA＇s sound field, we concluded that pressure intensity in focal area of MPA is enhanced observably, and range to be scanned which has effective contrast resolution is enlarged.
出处
《压电与声光》
CSCD
北大核心
2006年第1期113-116,共4页
Piezoelectrics & Acoustooptics
基金
清华大学"九八五"重点基金资助项目"无损检测与质量控制"(012-081100501)
关键词
混频相控阵
阵列优化
超声成像
mixing frequency phased array
ultrasound testing
optimization
