Body Kernels - Siemens SOMATOM Manual

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Body Kernels

The endings "s" or "f" depend on the rotation time.
• As standard kernels for body tissue studies B30s or
B40s are recommended; softer images are obtained
with B20s or B10s (extremely soft). The kernels B31s
or B41s have about the same visual sharpness as
B30s, respectively, B40s, the image appearance,
however, is more agreeable due to a "fine-grained"
noise structure; quite often, the low contrast detect-
ability is improved by using B31s, B41s instead of
B30s, B40s.
• For higher sharpness, as is required for example, in
patient protocols for cervical spine, shoulder,
extremities, thorax, the kernels B50s, B60s, B70s,
B80s are available.
• The special kernels are mostly used for "physical"
measurements with phantoms, for example, for
adjustment procedures (S80s), for constancy and
acceptance tests (S80s, S90s), or for specification
purposes (S90s).
For special patient protocols, S80s and S90s are cho-
sen, for example, for osteo (S80s).
It is mandatory to position the area of interest in the
center of the scan field. Use ExtrCombi mode when a
scan FoV > 25 cm is necessary.
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