Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automatic Calibration Method of Voxel Size for Cone-beam 3D-CT Scanning
  System   For cone-beam three-dimensional computed tomography (3D-CT) scanning system,
voxel size is an important indicator to guarantee the accuracy of data analysis
and feature measurement based on 3D-CT images. Meanwhile, the voxel size
changes with the movement of the rotary table along X-ray direction. In order
to realize the automatic calibration of the voxel size, a new
easily-implemented method is proposed. According to this method, several
projections of a spherical phantom are captured at different imaging positions
and the corresponding voxel size values are calculated by non-linear least
square fitting. Through these interpolation values, a linear equation is
obtained, which reflects the relationship between the rotary table displacement
distance from its nominal zero position and the voxel size. Finally, the linear
equation is imported into the calibration module of the 3D-CT scanning system,
and when the rotary table is moving along X-ray direction, the accurate value
of the voxel size is dynamically exported. The experimental results prove that
this method meets the requirements of the actual CT scanning system, and has
virtues of easy implementation and high accuracy

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph