Model-Guided Manufacturing of Transducer Arrays Based on Single-Fibre Piezocomposites

Angerer, Martin; Zapf, Michael; Leyrer, Benjamin; Ruiter, Nicole V.

doi:10.3390/app10144927

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…This could be because the PZT vibration is dominated by the coupling of lateral and thickness modes, which may not be effectively damped by the backing layer. Other UST transducers with a similar backing material had a larger resonance phase angle of -62.5 • , and were damped laterally by epoxy [33], but in this work the lateral damping was very weak, since the kerfs were filled with water during the impedance measurement (polyurethane for the final transducers), creating a large reflection coefficient at the PZT-kerf boundary.…”

Section: Electrical Input Impedancementioning

confidence: 95%

open-UST: An Open-Source Ultrasound Tomography Transducer Array System

Roberts¹,

Martin²,

Brown³

et al. 2023

Preprint

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Fast imaging methods are needed to promote widespread clinical adoption of Ultrasound Tomography (UST), and more widely available UST hardware could support the experimental validation of new measurement configurations. In this work, an open-source 256-element transducer ring array was developed (morganjroberts.github.io/open-UST) and manufactured using rapid prototyping, for only £2k. Novel manufacturing techniques were used, resulting in a 1.17 • mean beam axis skew angle, a 104 µm mean element position error, and a ±13.6 µm deviation in matching layer thickness. The nominal acoustic performance was measured using hydrophone scans and watershot data, and the 61.2 dB SNR, 55.4 • opening angle, 16.3 mm beamwidth and 54% transmit-receive bandwidth (-12 dB), were found to be similar to existing systems, and compatible with full waveform inversion reconstruction methods. The inter-element variation in acoustic performance was typically <10% without using normalisation, meaning that the elements can be modelled identically during image reconstruction, removing the need for individual source definitions based on hydrophone measurements. Finally, data from a phantom experiment was successfully reconstructed. These results demonstrate that the open-UST system is accessible for users, and suitable for UST imaging research.

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Section: Electrical Input Impedancementioning

confidence: 95%

open-UST: An Open-Source Ultrasound Tomography Transducer Array System

Roberts¹,

Martin²,

Brown³

et al. 2023

Preprint

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show abstract

“…To determine the impact of the mouse skull on the pressure field a dissected mouse skull was placed in front of a custom built US transducer [4], in an experimental water tank setup. The output signal, a chirp with a center frequency of 2.5 MHz and a bandwidth of 3 M Hz, was recorded by a hydrophone, which was moved in a 2D semi-spherical pattern, with a radius of 15 cm to the transducer.…”

Section: A Reference Measurementmentioning

confidence: 99%

Towards Subject-Specific Therapy Planning for Non-Invasive Blood Brain Barrier Opening in Mice by Focused Ultrasound

Gross

Hopp

Grudzenski-Theis

et al. 2021

2021 IEEE International Ultrasonics Symposium (IUS)

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Focused ultrasound (FUS) is a promising method to open the blood brain barrier (BBB) for treatment of neurodegenerative diseases. Accurate targeting is essential for a successful BBB opening (BBBo). We aim to develop a robust therapy planning for BBBo in mice, which is challenging due to the size of the brain and the influence of the skull on the ultrasound pressure distribution. For enabling mouse individual therapy planning, a simulation tool is proposed, developed and validated. We used the k-Wave toolbox to enable 3D acoustic simulations of the commercial FUS system from Image Guided Therapy (IGT). Micro-CT scans were used to model the geometry of skulls. Simulations using a mouse skull showed an attenuation of approx. 20-24% depending on the position of penetration, which was validated by hydrophone measurements in the same range. Based on these validations we planned BBBo in mice by placing the transducer at different positions over the mouse brain and varying the excitation amplitude. With different transducer positions, the peak pressure in the brain varied between 0.54 M P a and 0.62 M P a at 11% output level, which is expected to enable safe BBBo. Subsequently, in vivo experiments were conducted using the aforementioned simulation parameters. BBBo was confirmed by contrast enhanced T1 weighted magnetic resonance images immediately after sonication.

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“…This Special Issue related to IWPMA 2019 is thus a showcase of this commitment in such an exciting field. The associated research ranges from materials and device design, such as efficient transducer arrays ( [1]), to device development, for example, in terms of lightweight ultrasonic motors able to provide high torque without generating electromagnetic interferences thanks to a large aperture ( [2]), cross-shaped design ( [3]) or conical design ( [4]). These advances make it possible to meet current industrial requirements, involving innovations such as underwater actuation for robot propulsion using a dual rotor mechanism ( [5]) or a micro-aerial vehicles with ultrasonic motor-driven flapping wings ( [6]).…”

mentioning

confidence: 99%