Siemens SOMATOM Emotion 6 Application Manual page 184

Extremities
Body kernels:
• 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 struc-
ture; quite often, the low contrast detectability is
improved by using B31s, B41s instead of B30s, B40s.
• The 2 kernels B35s and B46s are especially designed
for cardiac application, in particular, B35s should be
used for Ca-scoring, and B46s for patency of stents.
• For higher sharpness, as is required e. g. in patient
protocols for cervical spine, shoulder, extremities,
thorax, lung, the kernels B50s, B60s, B70s, B80s are
available.
• A special high resolution lung kernel is supplied
with B90s; by using kernel B90s, practically the same
image impression is obtained as with HCE-filtering of
a B40s image.
• The special kernels are mostly used for "physical"
measurements with phantoms, e. g. for adjustment
procedures (S80s), for constancy and acceptance
tests (S80s, U90s), or for specification purposes
(U90s).
• For special patient protocols, S80s and U90s are
chosen, e. g. for osteo (S80s) and for high resolution
bone studies (U90s). We recommend to use the high
resolution specification kernel U90s only with "small"
objects, like the wrist, otherwise artifacts will occur
in the images.
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