The Speed of Sound Analysis from Micro to Macro Size by Wide Area Ultrasound Microscopic Measurement

In this study, we report the examination results of the speed of sound of sliced rat organs analyzed with high frequencies (80 and 250 MHz) ultrasound from the acquiring radiofrequency (RF) echo signals observed by our self-made scanning acoustic microscopy (SAM) system. The frequency dependence of the speed of sound was evaluated by the analysis method involving filtering considering a spatial resolution at each frequency.