title: C-scan ultrasonography in orbital diagnosis.
abstract: A C-scan imaging facility has recently been added to the ultrasonic system in use at Moorfields Eye Hospital, London. The technique is explained and typical C-scans are presented to demonstrate the normal orbital fat and optic nerve, together with selected pathological conditions in the orbit. The C-scan facility permits imaging of the orbital contents in the coronal plane. This coronal plane imaging, together with high resolution and sensitivity, makes this a useful technique for demonstrating orbital lesions and it is hoped helps in the accurate measurement of the diameters of the optic nerve along its length. The problems associated with C-scanning are discussed.
mesh_terms: D000273:Adipose Tissue / Q000473:pathology; D005128:Eye Diseases / Q000175:diagnosis; D006801:Humans; D009900:Optic Nerve / Q000473:pathology; D009915:Orbit / Q000473:pathology; D009918:Orbital Neoplasms / Q000175:diagnosis; D014463:Ultrasonography