Li Na, Chen Zihao, Zhu Jiejun, Choi Mi Hyun, Yang Jin, Yuan Zhen, Sun Lei, Fei Chunlong, Qiu Zhihai
School of Microelectronics, Xidian University, Xi'an; Guangdong Institute of Intelligence Science and Technology, Hengqin, Zhuhai, Guangdong 519031, China.
Guangdong Institute of Intelligence Science and Technology, Hengqin, Zhuhai, Guangdong 519031, China.
Heliyon. 2023 Mar 1;9(3):e14227. doi: 10.1016/j.heliyon.2023.e14227. eCollection 2023 Mar.
The sound velocity in a medium is closely related to its material properties, including its composition, structure, density, pressure, and temperature. Various methods have been developed to determine the sound velocity through materials. Among them, a strategy based on ultrasound resonance frequency has been most widely used due to the simplicity. However, it requires a transducer with a wide bandwidth to cover enough resonance frequencies to perform the consequent calculations. In this paper, we develop a resonance method for measuring sound velocity, using multi-frequency narrow-band transducers breaking through the limitation of transducer bandwidth on the utilization of the resonance method. We use different transducers at different center frequencies and with different bandwidth to measure the sound velocity in 100-μm and 400-μm thick steel pieces. The measurement results of different combinations are in good agreement, verifying that the use of multi-frequency narrow-band transducer combinations. Given that most therapeutic transducers have a narrow bandwidth, this method can be used during intracranial ultrasound stimulation to optimize targeting by non-invasively measuring the sound velocity in the skull, especially at thinner locations.
介质中的声速与其材料特性密切相关，包括其成分、结构、密度、压力和温度。已经开发出各种方法来测定通过材料的声速。其中，基于超声共振频率的策略由于其简单性而被最广泛地使用。然而，它需要一个具有宽带宽的换能器来覆盖足够的共振频率以进行后续计算。在本文中，我们开发了一种用于测量声速的共振方法，使用多频窄带换能器突破了换能器带宽对共振方法利用的限制。我们使用不同中心频率和不同带宽的不同换能器来测量100μm和400μm厚钢片的声速。不同组合的测量结果吻合良好，验证了多频窄带换能器组合的使用。鉴于大多数治疗换能器具有窄带宽，该方法可在颅内超声刺激期间通过非侵入性测量颅骨中的声速来优化靶向，特别是在较薄的部位。
