Study of Crosstalk in Linear Ultrasonic Transducer Arrays

摘要

Ultrasound systems using multielement ultrasonic arrays of piezoceramic transducers play an important role in medical diagnostics for imaging the inside of the human body in vivo. In the process of continuous improvements of operation parameters and measurement precision of those arrays, it turns out that crosstalk effects are one of the main reasons of distortions, which negatively affect the quality of the obtained ultrasonic images. Crosstalk is both a very important and complicated undesirable component of ultrasonic array transducer performance. When one element of the array is driven, it generates parasitic displacement fields at the radiating surfaces of the adjacent elementary transducers, which changes the directivity of used aperture. It directly affects low level decay through delayed signals from adjacent elements and it limits angular dispersion by increasing effective element size. This work presents a study of the phenomenon of crosstalk in one-dimensional linear ultrasonic arrays of piezoelectric transducers (designed for medical imaging), depending on the type of the front matching layer. Additionally, the paper covers the analysis of the effect of the array's activated elementary transducer's position on the intensity and symmetry of crosstalk on adjacent transducers.