Figure 1.

High-intensity focused ultrasound energy plan on a transversal slice; image obtained during treatment for rectal endometriosis. Balloon around the probe. RM, rectal mucosae; RN, rectal nodule developed from the right uterosacral ligament; EL, limits of endometrial nodule, defined manually by the clinician. The number of HIFU beams required to treat the area is based directly on this contouring. TD, limits of the thermal diffusion depending on number of HIFU beams (yellow line); Hb, HIFU beams; HIFU, high-intensity focused ultrasound.