Head
Hints in General
•Topogram: Lateral, 256 mm.
•Patient positioning:
Patient lying in supine position, arms resting against body, secure head well in the head holder, support lower legs.
•Gantry tilt is available for both, sequence and spiral scanning.
However, image artifacts may occur if spirals are acquired with a tilt angle greater than 8°.
•For all head studies, it is very important for image quality to position the patient in the center of the scan field. Use the lateral laser beam to make sure that the patient is positioned in the center.
•In order to optimize image quality versus radiation dose, scans are provided within a maximum scan field of 300 mm with respect to the
Head Kernels
•For soft tissue head studies, the standard kernel is H41s; softer images are obtained with H31s or H21s sharper images with H50s.
•High resolution head studies should be performed with H60s, H70s (e.g., for dental and sinuses) and H80s (e.g., inner ear).
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