Head CT > Technique


Technique

In order to perform a head CT, the patient is placed on the CT table in a supine position and the tube rotates around the patient in the gantry. In order to prevent unnecessary irradiation of the orbits and especially the lenses, Head CTs are performed at an angle parallel to the base of the skull. Slice thickness may vary, but in general, it is between 5 and 10 mm for a routine Head CT. Intravenous contrast is not routinely used, but may be useful for evaluation of tumors, cerebral infections, and in some cases for the evaluation of stroke patients.



Which of the following is NOT true concerning the process of performing a head CT?

Head CTs are performed at an angle parallel to the base of the skull.
Slice thickness is generally between 5 and 10 mm.
Intravenous contrast is routinely used.
The patient is placed in a supine position on the table.



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