Roberts, Morgan; Martin, Elly; Brown, Michael; Cox, Ben; Treeby, Bradley; (2022) Matching Layer Deposition for an Open-Source Ultrasound Tomography System: Inter-Element Variation in Frequency Response. In: 2022 IEEE International Ultrasonics Symposium (IUS), Proceedings. IEEE: Venice, Italy.

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Abstract

Progress towards fast accurate Ultrasound Tomog-raphy (UST) requires experimental validation of new methods, creating a need for low-cost UST hardware, which can be achieved using in-house manufacture. However, a key challenge for transducer manufacture is controlling the composition and thickness of matching layers. For this work, a new low-cost deposition technique was developed, which is part of the open-UST manufacturing framework. To assess the technique, 8 16-element UST transducer modules were built, and the inter-element variation in their electrical input impedance, impulse response, and transmit-receive response was measured. The acoustic performance was highly uniform with no defective elements. The −40 dB transmit-receive bandwidth was 146 %, with a mean SNR of 60.5 dB, and the standard deviation in amplitude at the 1.21 MHz fundamental frequency, was very low (σ= ± 7.1 %, without using normalisation. The high uniformity is significant, because it means that the elements can be assumed to be identical during image reconstruction, which simplifies the assumptions required, and removes the need for extensive hy-drophone calibration. The open-UST manufacturing framework could therefore lower the barrier to entry for researchers, and accelerate preliminary UST research.

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