The quality of ultrasound imaging depends on the bandwidth (BW) and sensitivity of the ultrasound transducer (UT). In general, the BW of the UT affects the longitudinal resolution of the imaging, while the sensitivity of the UT affects the detection range of the imaging. However, the BW and sensitivity of UT have been constrained by the limitation of acoustic matching design, resulting in a mutually restrictive relationship. In this article, synergistic enhancement of BW and sensitivity properties of the Pb(Mg $_{\mathrm {1/3}}$ Nb $_{\mathrm {2/3}})\text{O}_{3}$ -PbTiO3 (PMN-PT) single crystal (SC) phased array UT was achieved with the novel acoustic reflection layer structure. The measured results of the pulse-echo response without inductance tuning demonstrate an increase in −6 dB BW of approximately 13% for the optimized UTs compared to the normal UTs. Additionally, the optimized UTs increase the echo amplitude, with a relative sensitivity (RS) of 5.8 dB higher than that of the traditional UTs. After inductance tuning, the BW and sensitivity of the optimized UT are still much better than that of the ordinary UT. Finally, the measurement results of the tissue phantom imaging show an improvement in resolution, clarity, penetration depth, and detection range for the optimized UTs. It can be concluded that the instrument composed of optimized UTs has a good application prospect in the fields of medical ultrasonic imaging and industrial nondestructive testing.

中文翻译：

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新型声失配结构协同增强相控阵超声换能器的带宽和灵敏度

超声成像的质量取决于超声换能器 (UT) 的带宽 (BW) 和灵敏度。一般来说，UT的带宽影响成像的纵向分辨率，而UT的灵敏度则影响成像的探测范围。然而，UT的带宽和灵敏度却受到声学匹配设计的限制，形成了相互制约的关系。在本文中，Pb(Mg) 的 BW 和灵敏度特性的协同增强 $_{\mathrm {1/3}}$ 铌 $_{\mathrm {2/3}})\text{O}_{3}$ -PbTiO3（PMN-PT）单晶（SC）相控阵UT通过新颖的声反射层结构实现。无需电感调谐的脉冲回波响应的测量结果表明，与正常 UT 相比，优化 UT 的 -6 dB BW 增加了约 13%。此外，优化后的UT增加了回波幅度，相对灵敏度（RS）比传统UT高5.8 dB。经过电感调谐后，优化后的UT的带宽和灵敏度仍然比普通UT好很多。最后，组织体模成像的测量结果表明，优化后的 UT 在分辨率、清晰度、穿透深度和检测范围方面都有所提高。由此可见，优化后的UT组成的仪器在医学超声成像和工业无损检测领域具有良好的应用前景。