Multiple frequencies ultrasonic imaging for alleviation of exposure risk

本研究开发了两种类型的多频率超声成像，以减轻生物组织的超声暴露风险。一种是“交叉双频波束对比回波法”，它测量两个不同频率波束交叉处的低速血流分布。另一种是多频回波法，它利用多个峰值频率的宽带脉冲波形成多频图像。

This study developed two types of multiple frequencies ultrasonic imaging for alleviation of ultrasound exposure risk of biological tissues. One is "crossed two-frequency beams contrast echo method", which measures distribution of low speed blood flow at the crossed area of two beams with different frequencies. The other is "multiple-frequency echo method", which forms multiple-frequency images using the broadband pulsed wave of multiple peak frequencies.