This study investigates the use of a non-magnetic screen during radiotherapy sessions for patients with mobile cancerous lesions. The focus is on patients undergoing treatment with Linac MRI for conditions such as those affecting the pancreas, liver, kidneys, adrenals, lungs, or adenopathy.

The study evaluates how well the non-magnetic screen works in helping patients manage their breathing during treatment. It looks at whether using this screen can change the time it takes for treatment compared to what the machine predicts.

• Who can participate: Adults 18 years and older who are starting radiotherapy on Linac MRI for a mobile cancerous lesion may participate. Key eligibility factors include being affiliated with the social security system and not having any visual disturbances or contraindications to MRI.
• Study details: Participants will undergo radiotherapy sessions with or without a non-magnetic screen to see how it affects their breathing management.
• Study timelines and visits: The study will last 1 to 2 weeks. The study requires 5 visits.