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

By Andreas Böhler

In this thesis, a monitoring procedure was once built 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 ameliorations to the latter have been important. The diversifications to the Moduleaf have been generally software-based. so as to decrease the complexity of the method, superseded digital elements have been changed with more recent parts the place practical.

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

Based at the effects, a tracking-capable add-on collimator looks a useful gizmo for lowering the margins for the therapy of small, slow-moving targets.

Radiotherapy is without doubt one of the most crucial equipment used for the remedy of melanoma. Irradiating a relocating goal is usually probably the most hard initiatives to complete in sleek radiotherapy.

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Extra resources for Collimator-Based Tracking with an Add-On Multileaf Collimator: Modification of a commercial collimator system for realtime applications

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1–6. 6524742. , A. Ayre, and C. Keydel (2008). Embedded Networking with CAN and CANopen. Copperhill Technologies Corporation. ISBN: 9780976511625. M. and F. Vasques (2003). “Reliable real-time communication in CAN networks”. 12, pp. 1594–1607. ISSN: 0018-9340. 2003. 1252855. Poulsen, Per Rugaard, Byungchul Cho, Amit Sawant, and Dan Ruan Paul J Keall (2010). “Detailed analysis of latencies in image-based dynamic MLC tracking”. 9. 3480504. Poulsen, Per Rugaard, Byungchul Cho, Amit Sawant, and Paul J Keall (2010).

The treatment field is loaded, visualised and the leaves are brought into the initial position. When performing a tracked treatment, the tracking system must be initialised and COSMICrt told where to receive the inputs from. From now on, the treatment field is constantly adapted to the new positions of the tumour as reported by the external system. The main interface of COSMICrt also displays a realtime graph showing the tracking target positional variations over time. The radiotherapist can use this display to verify the movements of the tumour.

297–303. ISSN: 0360-3016. Ikushima, Hitoshi (2010). “Radiation therapy: state of the art and the future”. 1,2, pp. 1–11. Inoue, Tetsuya et al. (2013). “Stereotactic body radiotherapy using gated radiotherapy with real-time tumor-tracking for stage I non-small cell lung cancer”. 1, p. 69. ISSN: 1748-717X. 1186/1748-717X-8-69. Inoue, T. et al. (2013). “Stereotactic body radiotherapy for pulmonary metastases”. English. 4, pp. 285–292. ISSN: 0179-7158. 1007/s00066-012-0290-1. A. et al. (2013). “CyberKnife robotic image-guided stereotactic radiotherapy for oligometastic cancer”.

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