Scanner User Manual

Scan and Reconstruction
27
Improved Head Imaging
An automatic bone correction algorithm has been
included in the standard image reconstruction. Using a
new iterative technique, typical artifacts arising from
the beam-hardening effect, e.g., Hounsfield bar, are
minimized without any additional post-processing.
This advanced algorithm allows for excellent images of
the posterior fossa, but also improves head image
quality in general. Bone correction is activated auto
-
matically for body region “Head”.
In order to optimize image quality versus radiation
dose, scans in the body region “Head” 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 location of the skull.
Head image without
correction.
Head image with cor-
rections.
C2-025.630.01.01.02_APPLICATIONGUIDE_SPIRIT.book Page 27 Friday, April 8, 2005 9:55 AM