Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A framework for assumption-free assessment of imperfect geometry of a
  linac C-arms   In the present paper a general setup for determination of imperfect geometry
of radiotherapeutic devices has been proposed that base on geometric algebra
framework. To account for this imperfect geometry, two methods of a calibration
were presented, consisting of determining for each angular position of a gantry
a correction shift which must be applied to the origin of a laboratory frame of
reference to place it along a radiation axis for this angular position. Closed
form solutions for these corrections are provided.

10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int