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3-Dimensional Ultrasonography
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Oblique sections demonstrate high reflectivity of the plaque's posterior surface.
3D ultrasound [(OTI) Ophthalmic Technologies, Inc. Toronto, Canada)] has been used to image radioactive eye-plaques while they are sewn beneath their intraocular tumors. This technique was used to make sure radioactive eye plaques are properly positioned beneath its intraocular tumor.
Ongoing studies are being directed toward using 3D images of the plaque and the tumor to refine radiation dose calculations. We have shown 3D images can be used to measure the actual distances between the radioactive seeds and the tumor. Clearly, in vivo dosimetry should allow for more accurate radiotherapy.
 A coronal reconstruction of the plaque demonstrates that it has been placed next to the optic nerve.
Due to its high reflectivity, the ophthalmic plaque casts a low reflective "acoustic shadow" into the orbit.
A juxtapapillary plaque can be seen to "tilt" away from the optic nerve.
References
Finger PT, Romero JM, Rosen RB, Iezzi R, Emery R, Berson A. Three-dimensional ultrasonography of choroidal melanoma.Localization of ophthalmic plaques. The Archives Ophthalmology 116:305-12, 1998.
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