Surface guidance compared with ultrasound-based monitoring and diaphragm position in cone-beam computed tomography during abdominal stereotactic radiotherapy in breath-hold

Setup and intra-fractional motion measurements using surface scanning in head and neck cancer radiotherapy– A feasibility study

“…Wei et al included 60H&N patients treated in an open face mask, but only the initial setup accuracy with or without the use of SGRT was tested [16] . Recent studies also showed a correlation between intrafraction motion determined with SGRT and CBCT for lung [28] and abdominal [29] stereotactic treatments. The correlation was less strong than in our study, which can be explained by the less rigid relation between external surface and tumor motion for thoracic and abdominal tumors compared to H&N tumors.…”

“…The use of surface-guided radiotherapy (SGRT) for improved patient positioning before online imaging, and for intra-fraction motion monitoring has rapidly increased. SGRT is used for treatment sites such as breast, thoracic, abdominal, pelvic, H&N and intracranial [14] , [15] , [16] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] ] However, SGRT for H&N has only been investigated in combination with an open face mask [14] , [15] , [16] . Irradiation without a face mask and applying optical surface scanning for accurate patient setup and intra-fractional motion monitoring would be even more patient friendly.…”