MRI is becoming a new important imaging modality for ocular tumours. The acquisition of the MR-images for therapy planning are acquired in supine position, but proton beam radiotherapy is performed with the patient in sitting position. By performing scans in supine and in flexed position, we found that this change in gravity direction produces no substantial changes (<0.3mm) in eye and tumour shape. Our results indicate that supinely acquired MR images can be used to accurately plan proton beam radiotherapy of ocular tumours.
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