Regensburg 2010 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 11: High-LET Radiation Therapy 1
ST 11.2: Vortrag
Donnerstag, 25. März 2010, 09:50–10:10, H41
Motion monitoring for particle therapy of intrafractional moving targets — •Peter Steidl1, Josef Bürkelbach2, Gabriele Sroka-Perez2, Thomas Haberer3, Marco Durante1, and Christoph Bert1 — 1GSI, Darmstadt, Deutschland — 2Universitätsklinikum Heidelberg, Deutschland — 3Heidelberger Ionentherapiezentrum (HIT), Deutschland
For radiotherapy of organs influenced by respiratory motion using a scanned particle beam rescanning, gating, and beam tracking have been proposed. For gating and especially for beam tracking a high tumor conformity of the applied dose distribution can be achieved. One requirement to reach this goal is precise and high-frequent motion monitoring. Precise data can be determined by x-ray fluoroscopy which results into radiation dose and should thus be minimized. High-frequent data can be acquired by external surrogates that e.g. measure the expansion of the chest. Precise data with a high sampling rate can be generated by combining surrogate and x-ray data in a correlation model.
We performed measurements to study the correlation of internal target motion and external motion surrogates. MV-x-ray-fluoroscopy images (SIEMENS ARTISTE) were taken temporally correlated to two external signals (GateRT and ANZAI belt). We successfully checked functionality and accuracy of the system in initial phantom measurements using a sliding table. We currently start collection of clinical data. The contribution will present data from the accuracy study as well as the correlation analysis for the first patients.