In radiotherapy, patient positioning has long been ensured by ionizing imaging (kV or MV). Over the past ten years, surface-guided radiotherapy has appeared in radiotherapy departments. It is a continuous three-dimensional acquisition of the surface of the patient, based on the use of several optical cameras. The acquired surface is compared to an expected surface (usually taken from the planning scanner). Operators can constantly appreciate poor position, anatomical deformity or patient shift. Thus, the system allows an aid to the positioning of the patient, possibly without tattooing, but also a follow-up of the patient during the duration of the session. The most obvious contribution of the system concerns the treatment of the breast. In fact, for this location, the bone registration is not ideal and the target is visible in surface-guided radiotherapy. These systems also make it possible to treat in deep inspiration breath hold. But several other locations can benefit from it (pelvis, thorax, etc.).

在放射治疗中，长期以来通过电离成像（kV 或 MV）来确保患者定位。近十年来，表面引导放射治疗已出现在放射治疗科中。它是基于使用多个光学相机对患者表面进行连续三维采集。将获取的表面与预期表面（通常取自规划扫描仪）进行比较。操作员可以不断发现不良位置、解剖畸形或患者移位。因此，该系统可以帮助患者定位，可能无需纹身，而且还可以在治疗期间跟踪患者。该系统最明显的贡献涉及乳房的治疗。事实上，对于这个位置，骨配准并不理想，并且在表面引导放射治疗中目标是可见的。这些系统还使得深吸气屏气治疗成为可能。但其他几个部位也可以从中受益（骨盆、胸部等）。