Fig. 1.

Surface guided radiotherapy (SGRT) workflow for deep-inspiration breath-hold since May 2018. SGRT signal for the movement in ventral-dorsal direction is shown in time for one fraction. During the imaging procedure (t = 50–235 sec), reference surfaces are captured (blue arrow) at the end of CBCT acquisition (indicated in green) to link the external surface to the internal anatomy on the CBCT, and after couch movement for setup correction (red). Afterwards, dose was delivered with four treatment beams (magenta). Prior to each DIBH, the patient was asked to deeply breathe in and out once. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)