Comparison of Magnetic Resonance Imaging–Based and Conventional Measurements for Proton Beam Therapy of Uveal Melanoma

Motivation: Proton therapy is a relatively new option for treatment of uveal melanomas. For adequate treatment, accurate measurement of tumour dimensions and tumour-marker distance is essential. The dedicated MRI protocol for uveal melanoma patients developed in our institution could be helpful. Goal(s): In this study, we compared MRI-based measurements with conventional ophthalmic measurements. Approach: Retrospectively, MRI based measurements of tumour dimensions and marker-tumour distances in 23 patients were compared with conventional ophthalmic measurements and evaluated. Results: MRI allowed for the three-dimensional assessment of the tumour. In specific patients, it provided a more reliable measurement of tumour dimensions and marker-tumour distances. Impact: Dedicated ocular MRI proved to be a reliable tool for measurements required in the planning of proton therapy in patients with uveal melanoma.