An ultrasound treatment device (1) comprising: a probe head (2) comprising an ultrasound transducer (3) and an imaging device (4), a deformable coupling balloon (5) with a cavity (6) between the probe head (2) and the coupling balloon (5) filled with a coupling liquid (7), a pressure sensor (9) for determining the pressure of the coupling liquid (7) in the cavity (6), a fluid control system (10), and a controller unit (13), wherein the device (1) is adapted to switch between at least two operating modes (I, II), where in a first operating mode (I) the pressure of the coupling liquid (7) is maintained to a first pressure value (P1), and in a second operating mode (II) the pressure of the coupling liquid (7) is maintained to a second pressure value (P2) higher than the first pressure value (P1).
