Now consider the ellipse described above centered at (x
l5
y^ and rotated
by an angle α as shown in Fig. 5b. Let P'(0, t) be the resulting projections.
They are related to P
e
(i) in (3) by
Pe(t)
= Pe-
a
(t-scos(
y
-e)) (4)
where s = y/xi
2
+ yi
2
and γ = tan
-1
^/^).
8.1 METHODS FOR GENERATING PROJECTION DATA
In this section we will show how in various practical applications the
projections of a two-dimensional function are generated.
8.1.1 Computerized X-Ray Tomography
Consider a parallel bea
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