OPTIma: a tracking solution for proton computed tomography in high proton flux environments
Abstract Currently there is a large discrepancy between the currents that are used for treatments in proton beam therapy facilities and the ultra low beam currents required for many proton CT imaging systems. Here we provide details of the OPTIma silicon strip based tracking system, which has been d...
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Published in | Journal of instrumentation Vol. 18; no. 4; p. P04026 |
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Main Authors | , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.04.2023
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Subjects | |
Online Access | Get full text |
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Summary: | Abstract
Currently there is a large discrepancy between the currents
that are used for treatments in proton beam therapy facilities and
the ultra low beam currents required for many proton CT imaging
systems. Here we provide details of the OPTIma silicon strip based
tracking system, which has been designed for performing proton CT
imaging in conditions closer to the high proton flux environments of
modern spot scanning treatment facilities. Details on the physical
design, sensor testing, modelling, and track reconstruction are
provided along with Monte-Carlo simulation studies of the expected
performance for proton beam currents of up to 50 pA at the nozzle
when using a σ= ∼10 mm spot scanning cyclotron
system. Using a detailed simulation of the proposed OPTIma system, a
discrepancy of less than 1% on the Relative Stopping Power is found
for various tissues when embedded within a 150 mm diameter Perspex
sphere. It is found that by accepting up to 7 protons per bunch it
is possible to operate at cyclotron beam currents up to 5 times
higher than would be possible with a single proton based readout,
significantly reducing the total beam time required to produce an
image, while also reducing the discrepancy between the beam currents
required for treatment and those used for proton CT. |
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ISSN: | 1748-0221 1748-0221 |
DOI: | 10.1088/1748-0221/18/04/P04026 |