![]() ![]() The purpose of contrast in the setting of head imaging is to evaluate the physiological and pathological processes that alter the permeability of the blood-brain barrier that causes abnormal contrast enhancement. In addition, CT is superior to MRI for evaluating osseous structures, such as calvarial or skull base fractures or craniosynostosis. The purpose of non-contrast head CT includes the evaluation of neurosurgical emergencies with high sensitivity, including acute intracranial hemorrhage, mass effect, territorial infarct, brain herniation or hydrocephalus. Due to its widespread availability, CT is more often performed than MRI in the acute setting. CT head without and with contrast can be performed for these indications if MRI, which is generally superior for these diagnoses, is contraindicated or unavailable. The administration of intravenous contrast media may improve the sensitivity for detecting brain neoplasms or infections. detection or evaluation of calcification.skull lesions (such as craniosynostosis, fibrous dysplasia, Paget disease, tumors). ![]()
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