Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An improved physics model for multi-material identification in photon
  counting CT   Photon-counting computed tomography (PCCT) with energy discrimination
capabilities hold great potentials to improve the limitations of the
conventional CT, including better signal-to-noise ratio (SNR), improved
contrast-to-noise ratio (CNR), lower radiation dose, and most importantly,
simultaneous multiple material identification. One potential way of material
identification is via calculation of effective atomic number and effective
electron density from PCCT image data. However, the current methods for
calculating effective atomic number and effective electron density from PCCT
image data are mostly based on semi-empirical models and accordingly are not
sufficiently accurate. Here, we present a physics-based model to calculate the
effective atomic number and effective electron density of various matters,
including single element substances, molecular compounds, and multi-material
mixtures as well. The model was validated over several materials under various
combinations of energy bins. A PCCT system was simulated to generate the PCCT
image data, and the proposed model was applied to the PCCT image data. Our
model yielded a relative standard deviations for effective atomic numbers and
effective electron densities at less than 1%. Our results further showed that
five different materials can be simultaneously identified and well separated in
a effective atomic number - effective electron density map. The model could
serve as a basis for simultaneous material identification from PCCT.

14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc