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Collimator-Based Tracking with an Add-On Multileaf Collimator - Modification of a commercial collimator system for realtime applications (Paperback, 1st ed. 2016)
Loot Price: R1,635
Discovery Miles 16 350
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Collimator-Based Tracking with an Add-On Multileaf Collimator - Modification of a commercial collimator system for realtime applications (Paperback, 1st ed. 2016)
Series: BestMedDiss
Expected to ship within 10 - 15 working days
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In this thesis, a tracking system was developed by modifying an
add-on collimator, the Siemens Moduleaf, for realtime applications
in radiotherapy. As the add-on collimator works almost completely
autonomously of the linear accelerator (LinAc), no modifications to
the latter were necessary. The adaptations to the Moduleaf were
mainly software-based. In order to reduce the complexity of the
system, outdated electronic parts were replaced with newer
components where practical. Verification was performed by measuring
the latency of the system as well as the impact on applied dose to
a predefined target volume, moving in the leaf's travel direction.
Latency measurements in software were accomplished by comparing the
target and current positions of the leaves. For dose measurements,
a Gafchromic EBT2 film was placed beneath the target 4D phantom, in
between solid water plates, and moved alongside with it. Based on
the results, a tracking-capable add-on collimator seems to be a
useful tool for reducing the margins for the treatment of small,
slow-moving targets. Radiotherapy is one of the most important
methods used for the treatment of cancer. Irradiating a moving
target is also one of the most challenging tasks to accomplish in
modern radiotherapy.
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