Orbital tissue characteristics on MRI of major structures in orbit


Aqueous, vitreous and CSF: Hypointense (dark black) on T1 and hyper intense (bright white) on T2.

Lens: Hyper intense in relation to vitreous (grey) on T1 and low intense (grey) on T2.

Scelera, choroid and retina: All the coats appearing as one signal, intermediate signal (grey) on T1 and hypointense (dark) on T2.

Extraocular muscles: Intermediate intense (grey) on T1 and T2 but enhance with contrast on T1.

Optic nerve: Signal has similar intensity as cerebral white matter (grey) on T1 and T2. Normal optic nerve does not enhance with contrast.

Optic nerve sheath: Contains CSF, hence hypointense (dark) on T1 and hyperintense (bright white) on T2.

Orbital fat: Hyperintense (bright white) on T1 and intermediate (grey) on T2 and becomes dark on fat suppressed images.

Lacrimal gland: Intermediate signals as grey matter (grey) on T1 and T2 and gives mottled appearance of reduced intensity in orbital fat in lacrimal gland area. It enhances with contrast [Figure 12].

Cortical bone: Not well delineated as it contains little free water and appears dark (signal void) in T1 and T2. Hence, orbital apex and intracanalicular portion of optic nerve can be better visualized as compared to that of CT.

Bone marrow: Intense signal on T1 and gray on T2 due to high fat contents.

Figure 9: T1 Coronal posterior

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