Main indications
CT of the orbits is the method of choice for trauma: it accurately shows fractures of the thin walls of the orbit, primarily a burst fracture of the lower wall, in which the contents of the orbit are displaced into the maxillary sinus with the development of double vision and retraction of the eye. The second important indication is the search for a foreign body, especially a metal one, which CT can reliably detect. The study is also used for exophthalmos, space-occupying formations of the orbit, inflammatory processes (orbital phlegmon as a complication of sinusitis) and for endocrine ophthalmopathy, when thickening of the extraocular muscles is assessed.
What is the power of computed tomography?
MSCT creates an image using X-rays and produces thin sections with high spatial resolution. It is indispensable where bone, lung tissue, fresh hemorrhage and precise vessel geometry are important, as well as in emergency situations - the examination takes seconds.
Three-dimensional reconstructions are constructed from the resulting sections: this allows the surgeon to see the anatomy in volume in advance and plan the intervention.
When you need contrast
Intravenous contrast dramatically increases the information content in the study of blood vessels, tumors, inflammatory processes and parenchymal organs. It shows the nature of the blood supply to the formation, which often determines its nature.
Before a contrast study, kidney function is assessed by creatinine level and an allergic history is clarified - reactions to iodine-containing drugs are rare, but require attention.
CT or MRI
- CT scan is better: bones, lungs, acute hemorrhage, stones, vessels, emergency conditions
- MRI is better: brain and spinal cord, soft tissues, joints, pelvis, liver
- CT is faster and more accessible, MRI does not provide radiation exposure
About radiation exposure
Computed tomography uses x-rays and is therefore prescribed according to indications. Modern machines use dose reduction protocols, and the information obtained from sound research usually far outweighs the risk. During pregnancy, CT scans are performed only for health reasons.