Surface-guided radiotherapy overview: Technical aspects and clinical applications.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.  In fact, for this location, the bone registration is not ideal and the target is visible in surface-guided radiotherapy. 
Surface-guided radiotherapy
It is a continuous three-dimensional acquisition of the surface of the patient, based on the use of several optical cameras. 
optical cameras
The acquired surface is compared to an expected surface (usually taken from the planning scanner). 
planning scanner