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D.T. Ginat et al.

 

 

2.18\ Orbital Radiation Therapy

Fiducial Markers

2.18.1\ Discussion

Stereotactic radiosurgery can be used to treat a variety of ocular tumors. Small tantalum ring

a

b

orbital radiation therapy fiducial markers are initially surgically sutured to the globe for tumor localization during treatment. The markers may be incidentally encountered on CT as tiny metallic structures along the surface of the globe (Fig. 2.67) and are compatible with MRI at 1.5 T.

Fig. 2.67  Tantalum rings. Axial (a) CT image shows three metallic markers along the surface of the left globe. Photograph of a tantalum ring (b) (Courtesy of Altomed)