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Fast imaging methods are needed to promote widespread clinical adoption ofUltrasound Tomography (UST), and more widely available UST hardware couldsupport the experimental validation of new measurement configurations. In thiswork, an open-source 256-element transducer ring array was developed(morganjroberts.github.io/open-UST) and manufactured using rapid prototyping,for only {\pounds}2k. Novel manufacturing techniques were used, resulting in a1.17$^{\circ}$ mean beam axis skew angle, a 104 $\mu$m mean element positionerror, and a $\pm$13.6 $\mu$m deviation in matching layer thickness. Thenominal acoustic performance was measured using hydrophone scans and watershotdata, and the 61.2 dB SNR, 55.4$^{\circ}$ opening angle, 16.3 mm beamwidth and54% transmit-receive bandwidth (-12 dB), were found to be similar to existingsystems, and compatible with full waveform inversion reconstruction methods.The inter-element variation in acoustic performance was typically <10% withoutusing normalisation, meaning that the elements can be modelled identicallyduring image reconstruction, removing the need for individual sourcedefinitions based on hydrophone measurements. Finally, data from a phantomexperiment was successfully reconstructed. These results demonstrate that theopen-UST system is accessible for users, and suitable for UST imaging research.

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