A capacitive micromachined ultrasonic transducer, CMUT, array probe with improved patient safety, said probe being connectable to an ultrasound system operating in a range of relatively low voltages, wherein said probe comprises: a substrate ; a plurality of CMUT cells located on the substrate , each cell having a top patient-facing electrode and a bottom electrode , probe electronics coupled to the CMUT cells and arranged to provide control signals to the cells and ultrasound signals from the cells ; wherein, a relatively low reference voltage is arranged to be coupled to the top electrodes of the CMUT cells ; and a relatively high DC bias voltage is arranged to be coupled to the bottom electrodes of the CMUT cells , wherein the relatively high DC bias voltage is larger than the relatively low reference voltage; the probe further comprising a probe cable having a first end coupled to the probe electronics and a second end coupleable to the ultrasound system and having one or more of a control signal line and an ultrasound signal line , wherein each control signal line is adapted to transmit the control signals from the ultrasound system to the probe electronics and each ultrasound signal line is adapted to transmit the ultrasound signals from the probe electronics to the ultrasound system ; and one or more level shifters coupled to the one or more control signal line and ultrasound signal line , wherein one or more level shifters is adapted to shift a baseline of the control signal to a range of the relatively high DC bias voltage and to shift a baseline of ultrasound signal to the range of the relatively low voltages, characterized in that the probe electronics is arranged to electrically float at a high voltage potential of the relatively high DC bias voltage relative to ultrasound system ground potential. a substrate ; a plurality of CMUT cells located on the substrate , each cell having a top patient-facing electrode and a bottom electrode , probe electronics coupled to the CMUT cells and arranged to provide control signals to the cells and ultrasound signals from the cells ; wherein, a relatively low reference voltage is arranged to be coupled to the top electrodes of the CMUT cells ; and a relatively high DC bias voltage is arranged to be coupled to the bottom electrodes of the CMUT cells , wherein the relatively high DC bias voltage is larger than the relatively low reference voltage; the probe further comprising a probe cable having a first end coupled to the probe electronics and a second end coupleable to the ultrasound system and having one or more of a control signal line and an ultrasound signal line , wherein each control signal line is adapted to transmit the control signals from the ultrasound system to the probe electronics and each ultrasound signal line is adapted to transmit the ultrasound signals from the probe electronics to the ultrasound system ; and one or more level shifters coupled to the one or more control signal line and ultrasound signal line , wherein one or more level shifters is adapted to shift a baseline of the control signal to a range of the relatively high DC bias voltage and to shift a baseline of ultrasound signal to the range of the relatively low voltages, characterized in that the probe electronics is arranged to electrically float at a high voltage potential of the relatively high DC bias voltage relative to ultrasound system ground potential. <EOS>