Fig. 7

2D MR thermometry maps during MRgHIFU hyperthermia of a bone tumor mimicking model, in a plane perpendicular to the bone long axis and with the focal point positioned in the center of the cortical breakthrough. Data are shown: a Prior to HIFU sonication, b–d 80 s, 160 s, and 320 s after the onset of HIFU sonication, respectively. Note the circumferential temperature elevation of the internal facet of the cortical bone (“acoustic oven effect”) and the evolution of the thermal build-up inside the medullar cavity towards a uniform distribution