Collimator-Based Tracking with an Add-On Multileaf by Andreas Böhler

By Andreas Böhler

In this thesis, a monitoring process used to be constructed by means of editing an add-on collimator, the Siemens Moduleaf, for realtime functions in radiotherapy. because the add-on collimator works nearly thoroughly autonomously of the linear accelerator (LinAc), no alterations to the latter have been priceless. The diversifications to the Moduleaf have been in most cases software-based. that allows you to lessen the complexity of the approach, superseded digital components have been changed with more recent parts the place practical.

Verification used to be played by means of measuring the latency of the approach in addition to the effect on utilized dose to a predefined objective quantity, relocating within the leaf's shuttle path. Latency measurements in software program have been complete through evaluating the objective and present positions of the leaves. For dose measurements, a Gafchromic EBT2 movie was once positioned underneath the objective 4D phantom, in among stable water plates, and moved along with it.

Based at the effects, a tracking-capable add-on collimator seems a useful gizmo for decreasing the margins for the remedy of small, slow-moving targets.

Radiotherapy is among the most vital tools used for the remedy of melanoma. Irradiating a relocating aim is usually essentially the most tough initiatives to complete in sleek radiotherapy.

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1. 1 Hz; The straight line indicates the target position, the triangled line the current position and the squared line the positioning error. All numbers are in isocentre plane, current and target position have a constant offset for better visibility. 39 Chapter 5. 2 Hz; The straight line indicates the target position, the triangled line the current position and the squared line the positioning error. All numbers are in isocentre plane, current and target position have a constant offset for better visibility.

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