Fig. 1From: Diagnostic methods and therapeutic options of uveal melanoma with emphasis on MR imaging—Part II: treatment indications and complicationsTantalum clips for proton-beam radiotherapy. a, b Tantalum clips (2.5 mm in diameter). c Fat-suppressed T1-weighted image shows the artefact produced by the clips (white arrows); the artefact is negligible since tantalum is a nonmagnetic metalBack to article page