Siemens syngo CT 2005C - Manual (Page 71)

Head
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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 iso-center. No
recon job with a field of view exceeding those limits
will be possible. Therefore, patient positioning has to
be performed accurately to ensure a centered loca-
tion of the skull.
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).
C2-025.630.01.01.02_APPLICATIONGUIDE_SPIRIT.book Page 71 Friday, April 8, 2005 9:55 AM