Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel range telescope concept for proton CT   Proton beam therapy can potentially offer improved treatment for cancers of
the head and neck and in paediatric patients. There has been a sharp uptake of
proton beam therapy in recent years as improved delivery techniques and patient
benefits are observed. However, treatments are currently planned using
conventional x-ray CT images due to the absence of devices able to perform high
quality proton computed tomography (pCT) under realistic clinical conditions. A
new plastic-scintillator-based range telescope concept, named ASTRA, is
proposed here to measure the proton's energy loss in a pCT system. Simulations
conducted using GEANT4 yield an expected energy resolution of 0.7\%. If
calorimetric information is used the energy resolution could be further
improved to about $0.5\%$. In addition, the ability of ASTRA to track multiple
protons simultaneously is presented. Due to its fast components, ASTRA is
expected to reach unprecedented data collection rates, similar to $10^8$
protons/s. The performance of ASTRA has also been tested by simulating the
imaging of phantoms. The results show excellent image contrast and relative
stopping power reconstruction.

1
The categories of this paper are: cs
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom