FIG 2. Coronal MR images of the retrobulbar space in a 12-year-old girl with dental braces.

A, FSEIR image shows that the evaluation of orbits is limited by artifact from the dental braces. Note the improved contrast between gray and white matter because of the additional T1 weighting caused by the inversion pulse.

B, 3PD water-plus-fat image (3000/85/8/1) offers dramatically improved signal; the artifact from the dental braces has a sharper margin.

C, 3PD pure water image (3000/85/8/1) shows superior anatomic detail compared with FSEIR.

D, 3PD pure fat image (3000/85/8/1) shows substantial signal from fat-containing structures outside the retrobulbar space.