Stability of backscattering coefficient evaluation with clinical ultrasound scanner in homogeneous medium when sound field characteristics differ from reference signal

Abstract

We investigated the differences between the transmission (Tx)/reception (Rx) sound fields for target and reference signals using a reference phantom method (RPM) to assess the stability of backscattering coefficient (BSC) evaluation. A clinical ultrasound scanner and two types of phased linear array transducer with low and high frequencies were used to evaluate the BSCs for two types of homogenous phantom with different attenuation coefficients and BSCs. Different Tx/Rx sound fields were reproduced using different combinations of Tx focus depths and aperture sizes. Target signals with Tx conditions that were both the same as and different from those for the reference signals were used to produce signals with different Tx/Rx sound fields. The differences in the Tx/Rx sound fields affected the depth dependence of the evaluated BSC. It was concluded that this can be a factor creating variation in the BSC for homogenous targets.

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