The inaugural workshop – MUST 2017 – was held in Speyer, Germany. The three-day workshop included eight invited talks, which covered the history and possible future trends of ultrasound tomography (J. Greenleaf), the clinical motivation (P. Littrup) and status of breast imaging (H. Madjar), the connection to seismics (A. Fichtner) and geophysics (G. Pratt), the latest trends in ultrasound transducers (N. de Jong) as well as the aspects of commercialisation of photoacoustic imaging systems (C. Wiest). Additionally 29 oral presentations were given and 11 posters were presented. In dedicated discussion sessions the current challenges and future directions of ultrasound tomography were discussed with the audience. 59 participants from 10 countries attended and actively contributed to a very successful workshop.