Fig. 23 (a) A 64 χ 64 display of the Shepp and Logan phantom, (b) Reconstruction of the
phantom from 120 projections and 101 rays in each projection, (c) The relative-uncertainty
image for the reconstruction in (b). (d) Graphical depiction of the relative-uncertainty values
through the horizontal middle line of (c).
relative
uncertainty at
(x,
y) = N
in
—
(Ji/
i
2
(
79
)
We
will now define a relative-uncertainty image as follows'ß
variance!
f(x, y)}
[exp{f(x,
y)}V
The
relative-uncertainty image becomes independent
of
the
number
of
inci-
dent
photon ...
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