A method for locating and visualizing a target belonging to a mammal, a human being in particular, in relation to a focal point of a treatment system using acoustic pressure waves, by means of an ultrasound imaging system comprising an ultrasound probe and at least one image display screen, the target and/or the treatment system being moved by displacing means (2, 30a, 30b) to cause the target to coincide with the focal point, characterized in that it comprises the following steps: - forming an ultrasound probe mobile in space, mechanically independent of the treatment system and located by a remote locating system when it lies within the detection volume thereof, - moving the ultrasound probe within the detection volume to visualize the target in an image displayed on the screen, - ensuring the simultaneous recording firstly of an ultrasound image in which the image of the target appears, and secondly of the position of the ultrasound probe, - selecting the position of the image of the target in the recorded ultrasound image, to determine the virtual position of the target, - simultaneously determining firstly the position of the focal point of the treatment system by means of the remote locating system, and secondly the position of the displacing means (2-30a;30b) moving the target and/or the treatment system, - calculating displacement values for the displacing means, from the virtual position of the target and from the positions of the focal point and of the displacing means, to allow the virtual position of the target to coincide with the focal point, characterized in that said method comprises the steps consisting in: - visualizing the virtual image of the target with the image of the focal point on the screen, and the movement thereof when causing the virtual image of the target to coincide with the focal point using the displacing means, - and moving the target and/or focal point via the displacing means in accordance with the calculated displacement values, so as to cause the virtual position of the target to coincide with the focal point. - forming an ultrasound probe mobile in space, mechanically independent of the treatment system and located by a remote locating system when it lies within the detection volume thereof, - moving the ultrasound probe within the detection volume to visualize the target in an image displayed on the screen, - ensuring the simultaneous recording firstly of an ultrasound image in which the image of the target appears, and secondly of the position of the ultrasound probe, - selecting the position of the image of the target in the recorded ultrasound image, to determine the virtual position of the target, - simultaneously determining firstly the position of the focal point of the treatment system by means of the remote locating system, and secondly the position of the displacing means (2-30a;30b) moving the target and/or the treatment system, - calculating displacement values for the displacing means, from the virtual position of the target and from the positions of the focal point and of the displacing means, to allow the virtual position of the target to coincide with the focal point, characterized in that said method comprises the steps consisting in: - visualizing the virtual image of the target with the image of the focal point on the screen, and the movement thereof when causing the virtual image of the target to coincide with the focal point using the displacing means, - and moving the target and/or focal point via the displacing means in accordance with the calculated displacement values, so as to cause the virtual position of the target to coincide with the focal point.