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Additional info for 2008-2009 Basic and Clinical Science Course: Section 7: Orbit, Eyelids, and Lacrimal System (Basic and Clinical Science Course 2008-2009)
Courtesy of Thomas Y Hwang, MD. PhD. ) 28 . Orbit, Eyelids, and Lacrimal System B Figure 2-4 T2-weighted MR images of the orbit. axial without fat suppression (A) and coronal with fat suppression (8). (Courtesy of Thomas Y Hwang, MO, PhO, and Timothy J. ) manipulated to interact with a magnetic field and RF waves, Under normal conditions, the charged nuclei spin about axes that point in random directions. Although many elements are capable of generating magnetic resonance signals, the hydrogen atom was selected for use because it is the most abundant element in the body.
The optic canal is medial to the superior orbital fissure within the lesser wing of the sphenoid bone. A narrow segment of bone, the optic strut, separates the optic canal from the superior orbital fissure. The inferior orbital fissure extends anteriorly and laterally between the lateral and inferior orbital walls. The inferior orbital fissure connects the orbit to the pterygopalatine fossa posteriorly and the infratemporal fossa anteriorly. The maxillary division of CN V leaves the cranium through the foramen rotundum into the pterygopalatine fossa and then travels into the orbit through the inferior orbital fissure.
Current CT scanners administer a dose of radiation of approximately 1-2 centi-Gray (cGy) per scanning plane. By comparison, a posteroanterior and lateral chest radiograph administers a dose of radiation of approximately 5 milli-Gray (mGy). The visualization of tumors that are highly vascular (eg, meningioma) or those with altered vascular permeability is improved by the use of intravenous contrast-enhancing agents. CT has resolution and tissue-contrast capabilities allowing imaging of soft tissues, bones, contrast -containing blood vessels, and foreign bodies.