Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal recovery of a radiating source with multiple frequencies along
  one line   We study an inverse problem where an unknown radiating source is observed
with collimated detectors along a single line and the medium has a known
attenuation. The research is motivated by applications in SPECT and beam
hardening. If measurements are carried out with frequencies ranging in an open
set, we show that the source density is uniquely determined by these
measurements up to averaging over levelsets of the integrated attenuation. This
leads to a generalized Laplace transform. We also discuss some numerical
approaches and demonstrate the results with several examples.

16
The categories of this paper are: stat
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc