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Tilted MRIs
The slice distance is
s
. Some TPS
look up the slice distance by
comparing the z-position of
adjacent slices. In this case
z
.
If angle α > 0,
z
is not equal to
s
.
E.g. for a tilt of 20
0
the difference is
6%. Pinnacle thus underestimates
the length of the scan in the cranial
caudal direction.
α
α
z
s