<s>
Geometric	B-Algorithm
tomography	I-Algorithm
is	O
a	O
mathematical	O
field	O
that	O
focuses	O
on	O
problems	O
of	O
reconstructing	O
homogeneous	O
(	O
often	O
convex	O
)	O
objects	O
from	O
tomographic	B-Algorithm
data	O
(	O
this	O
might	O
be	O
X-rays	O
,	O
projections	O
,	O
sections	O
,	O
brightness	O
functions	O
,	O
or	O
covariograms	O
)	O
.	O
</s>
<s>
More	O
precisely	O
,	O
according	O
to	O
R.J.	O
Gardner	O
(	O
who	O
introduced	O
the	O
term	O
)	O
,	O
"	O
Geometric	B-Algorithm
tomography	I-Algorithm
deals	O
with	O
the	O
retrieval	O
of	O
information	O
about	O
a	O
geometric	O
object	O
from	O
data	O
concerning	O
its	O
projections	O
(	O
shadows	O
)	O
on	O
planes	O
or	O
cross-sections	O
by	O
planes.	O
"	O
</s>
<s>
Funk	B-Algorithm
transform	I-Algorithm
(	O
a.k.a.	O
</s>
