EP-1305: Management of the interruptions in the conventional treatment of prostate cancer upon a database analysis
Abstract
Purpose/Objective: The delivery of high quality stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT) treatments requires knowledge of the position of the isocentre to sub millimetre accuracy. The deviation between the radiation and mechanical isocentres must be less than 1 mm. The use of an add-on micromultileaf collimator (μMLC) in SRS and SRT is an additional challenge to the anticipated high-level geometric and dosimetric accuracy of the treatment. The aim of this work was to quantify the gantry excursions during rotation with and without an add-on μMLC attached to the gantry head. In addition, the shift in the position of the isocenter and its correlation to the kV beam centre of the cone-beam CT system was included in the study. Materials and Methods: The quantification of the gantry rotational performance was done using a pointer supported by an inhouse made rigid holder attached to the gantry head. The pointer positions were measured using a digital theodolite. The displacement of the isocentre due to an add-on μMLC of 50 kg was investigated. In case of the pointer measurement the μMLC was simulated by weights attached to the gantry head. A method of least squares was applied to determine the position and displacement of the mechanical isocentre. Additionally, the displacement of the radiation isocentre was measured using a Winston-Lutz phantom and the electronic portal image device (EPID) system. These measurements were based on eight MV photon beams…
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