Abstract: A method of determining the real distance between an emitter/receiver face (212) of an imaging probe (2) and a target site, the probe emitting and receiving waves through a propagation medium and living tissue, the method comprising the following successive steps: determining the theoretical distance between the face and the target site when the face is separated from the target site only by the living tissue; determining a distance correction resulting from the fact that the emitted and received waves have passed through the propagation medium; and applying said correction to the theoretical distance so as to obtain the real distance.

Abstract: An imaging and treatment head for imaging and treating an organ or tissue of a living being, and usable in particular for treating tumors of the prostate or the thyroid, said head comprising: imaging means (2), such as an ultrasonic probe, that are suitable for emitting waves or radiation so as to provide an imaged representation of an organ or tissue for treatment; and treatment means (4) that are suitable for treating said organ or tissue locally, the treatment means being suitable for emitting waves or radiation so as to treat the organ or the tissue; said head being characterized in that the imaging means (2) are mounted in removable manner on an adapter (3; 3?) that ensures positioning of the imaging means (2) relative to the treatment means (4).