A new silicon tracker for proton imaging and dosimetry.
For many years, silicon micro-strip detectors have been successfully used as tracking detectors for particle and nuclear physics experiments. A new application of this technology is to the field of particle therapy where radiotherapy is carried out by use of charged particles such as protons or carbon ions. Such a treatment has been shown to have advantages over standard x-ray radiotherapy and as a result of this, many new centres offering particle therapy are currently under construction around the world today. The Proton Radiotherapy, Verification and Dosimetry Applications (PRaVDA) consortium are developing instrumentation for particle therapy based upon technology from high-energy physics. The characteristics of a new silicon micro-strip tracker for particle therapy will be presented. The array uses specifically designed, large area sensors with technology choices that follow closely those taken for the ATLAS experiment at the HL-LHC. These detectors will be arranged into four units each with three layers in anx-u-vconfiguration to be suitable for fast proton tracking with minimal ambiguities. The sensors will form a tracker capable of tracing the path of ~200 MeV protons entering and exiting a patient allowing a new mode of imaging known as proton computed tomography (pCT). This will aid the accurate delivery of treatment doses and in addition, the tracker will also be used to monitor the beam profile and total dose delivered during the high fluences used for treatment. We present here details of the design, construction and assembly of one of the four units that will make up the complete tracker along with its characterisation using radiation tests carried out using a90Sr source in the laboratory and a 60 MeV proton beam at the Clatterbridge Cancer Centre.
Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK.
J T
JT
Taylor
Laboratory of Vision Engineering, School of Computer Science, University of Lincoln, Lincoln LN6 7TS, UK.
C
C
Waltham
School of Physics and Astronomy, University of Birmingham, Birmingham B25 2TT, UK.
T
T
Price
Laboratory of Vision Engineering, School of Computer Science, University of Lincoln, Lincoln LN6 7TS, UK.
N M
NM
Allinson
School of Physics and Astronomy, University of Birmingham, Birmingham B25 2TT, UK.
P P
PP
Allport
Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK.
G L
GL
Casse
Douglas Cyclotron, The Clatterbridge Cancer Centre NHS Foundation Trust, Clatterbridge Road, Bebington, Wirral CH63 4JY, UK.
A
A
Kacperek
Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
S
S
Manger
Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK.
N A
NA
Smith
Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK.
I
I
Tsurin
Dosimetry; Proton computed tomography; Proton therapy; Silicon tracking detectors
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