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Realization of an pseudo-randomly sampled 3D USCT

A promising candidate for improved imaging of breast cancer is ultrasound tomography (USCT). To make full use of the 3D interaction of the ultrasound fields with the breast, we are focusing our research on full 3D USCT systems. While our previous 3DUSCTII device allowed nearly unfocussed emission and reception with approx. 600 emitters and 1400 receivers, the spatial sampling of the object is very sparse. In order to improve contrast in a sparse system, we realized an optimized pseudo-randomly sampled USCT device (3DUSCTIII) with approx. 2300 transducers. Additionally, the opening angle, the bandwidth and the active area of the transducers were improved. New front-end electronics with custom ASICs allow bidirectional operation of the transducers to acquire approx. six times more A-scans at one data acquisition step. This paper presents the setup of the new system and initial results acquired during the ongoing commissioning.