Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Effective Heuristics for Beam Angle Optimization in Radiation
  Therapy   In radiation therapy, mathematical methods have been used for optimizing
treatment planning for delivery of sufficient dose to the cancerous cells while
keeping the dose to critical surrounding structures minimal. This optimization
problem can be modeled using mixed integer programming (MIP) whose solution
gives the optimal beam orientation as well as optimal beam intensity. The
challenge, however, is the computation time for this large scale MIP. We
propose and investigate two novel heuristic approaches to reduce the
computation time considerably while attaining high-quality solutions. We
introduce a family of heuristic cuts based on the concept of 'adjacent beams'
and a beam elimination scheme based on the contribution of each beam to deliver
the dose to the tumor in the ideal plan in which all potential beams can be
used simultaneously. We show the effectiveness of these heuristics for
intensity modulated radiation therapy (IMRT) and stereotactic body radiation
therapy (SBRT) on a clinical liver case.

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The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex