The diagnostic reference level (in terms of volume CTDI) is 75 mGy. The pass/fail limit (in terms of volume CTDI) is 80 mGy. These values are for a routine adult head exam and may be significantly different (higher or lower) for a given patient with unique indications. NOTE: All volume CTDI values are for the 16-cm diameter CTDI phantom.. principles for performing high-quality CT imaging of the brain in pediatric and adult patients, including advanced applications such as CT perfusion, CT volumetry, CT angiography, and CT venography. II. INDICATIONS Indications for CT of the brain include, but are not limited to: A. Primary Indications 1. Acute head trauma. 2.
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Head CT. Computed tomography (CT) of the head uses special x-ray equipment to help assess head injuries, severe headaches, dizziness, and other symptoms of aneurysm, bleeding, stroke, and brain tumors. It also helps your doctor to evaluate your face, sinuses, and skull or to plan radiation therapy for brain cancer.. Non-contrast studies of the brain and spine are sufficient for most indications. Diagnosis of common conditions such as cerebral infarction and haemorrhage can be made without intravenous contrast. A contrast-enhanced CT of the brain is of value in specific situations (eg known CNS tumour, investigation for potential intracranial metastases.
