The aim of this study is to investigate the technical feasibility of brain radiotherapy without immobilization masks using surface imaging to ensure accurate patient positioning and continuous motion monitoring.
Age >= 18 years old
Brain tumor treated with fractionated radiotherapy
Able to read and complete a questionnaire in French
Inability to remain still
Single group
Surface Guided Radiation Therapy without mask
DevicePatients are positioned using SGRT based on the reference position reconstructed from the simulation scanner. They are asked to remain still during the typical duration of a conventional radiotherapy session. Patient motion is monitored by SGRT throughout the simulated session. A CBCT scan is performed before and after the session. No treatment is delivered.
Stability of patient's position
The stability of the patient's position will be assessed: * on the basis of "internal" movements (of the skull) detected by scanner imaging before and after the simulated session (on-board CBCT) * on the basis of surface movements monitored by SGRT throughout the session.
Patient's feelings with and without the mask
Patients are asked to fill in a questionnaire about their feelings (comfort, anxiety, claustrophobia, isolation, pain) during radiotherapy sessions with a mask and simulated sessions without an immobilization mask.
Preference of treatment
Patients are asked to indicate whether they prefer to be treated with or without a mask.
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