A device for therapeutic treatment comprising: - a HIFU transducer for generating and transmitting HIFU pulses to a target, the HIFU transducer being operable in at least a probing mode during a probing phase and in a treatment mode during a treatment phase, wherein in the probing phase the HIFU transducer is operated with at least one probing operation characteristic, said operation characteristic including emission of a pulse with a focal point, and wherein in the treatment phase, the HIFU transducer is operated with at least one treatment operation characteristic different from the probing operation characteristic, - a detector designed to detect a change of tissue properties caused by said HIFU pulses in the target during said probing phase, - calculating means for determining at least one probing parameter necessary to achieve said change of tissue properties detected by the detector during the probing phase - a control for defining treatment parameters on the basis of said at least one probing parameter, - wherein said control is further designed to change the operation characteristics from the probing phase to the treatment phase by increasing an area on the target of at least one pulse impinged by said HIFU pulse during the treatment phase, - characterized in that: the control is designed to generate a HIFU pulse during the treatment phase that is longer than during the probing phase and - wherein said control is designed to increase the area on the target impinged by said HIFU pulse by one of o moving said focal point over the target in a predefined trajectory, such that at least one point on the target is impinged more often than remaining points on the trajectory, or o defocussing the HIFU pulses. - a HIFU transducer for generating and transmitting HIFU pulses to a target, the HIFU transducer being operable in at least a probing mode during a probing phase and in a treatment mode during a treatment phase, wherein in the probing phase the HIFU transducer is operated with at least one probing operation characteristic, said operation characteristic including emission of a pulse with a focal point, and wherein in the treatment phase, the HIFU transducer is operated with at least one treatment operation characteristic different from the probing operation characteristic, - a detector designed to detect a change of tissue properties caused by said HIFU pulses in the target during said probing phase, - calculating means for determining at least one probing parameter necessary to achieve said change of tissue properties detected by the detector during the probing phase - a control for defining treatment parameters on the basis of said at least one probing parameter, - wherein said control is further designed to change the operation characteristics from the probing phase to the treatment phase by increasing an area on the target of at least one pulse impinged by said HIFU pulse during the treatment phase, - characterized in that: the control is designed to generate a HIFU pulse during the treatment phase that is longer than during the probing phase and - wherein said control is designed to increase the area on the target impinged by said HIFU pulse by one of o moving said focal point over the target in a predefined trajectory, such that at least one point on the target is impinged more often than remaining points on the trajectory, or o defocussing the HIFU pulses. o moving said focal point over the target in a predefined trajectory, such that at least one point on the target is impinged more often than remaining points on the trajectory, or o defocussing the HIFU pulses.