Photo: M Halonen
Physicians often need to perform challenging needle insertions, injections, or tissue sampling procedures without direct visibility of the target or knowing the exact position of the needle tip. In her doctoral research, M.Sc. (Tech.) Sanna Halonen studied, developed, and evaluated a real-time tissue-sensing system based on bioimpedance measurements for needle guidance. She demonstrated that real-time bioimpedance-based tissue sensing is spatially precise and clinically applicable. The measurement area is located at the needle tip bevel and surrounding tissues do not interfere with the measurement or tissue identification. In the future, reliable tissue sensing at the needle tip could potentially change the way challenging needle procedures are performed.
The doctoral dissertation of M.Sc. (Tech.) Sanna Halonen titled Bioimpedance-based real-time tissue-sensing for needle guidance will be publicly examined at Tampere University, Faculty of Medicine and Health Technology, on 6 February 2026.
The opponent will be Professor Steffen Leonhardt from RWTH Aachen University, Germany. The custos will be Professor Jari Hyttinen from Tampere University, Faculty of Medicine and Health Technology.