SU‐E‐T‐705: Skin Dosimetry Comparisons of CyberKnife and Tomotherapy for Head‐And‐Neck Stereotatic Body Radiotherapy

TL;DRAbstract

Purpose: To perform a comparative evaluation of the skin dose in CyberKnife and Tomotherapy to predict an accurate dose in head‐and‐neck SBRT. Methods: Arbitrarily‐defined planning target volume (PTV) near the skin was drawn on planning CT acquired from an anthropomorphic head‐and‐neck phantom that is used to perform the end‐to‐end test in CyberKnife. Calculation doses were obtained from Multiplan treatment planning system (TPS) using ray‐tracing and monte‐carlo (MC) algorithms for CyberKnife. For Tomotherapy, the skin dose was estimated with convolution superposition (CS) algorithm from Volo TPS. We selected 90% coverage of PTV in 3Gy prescription dose. We compared skin doses near target and at 5 cm far from the target. Optically‐stimulated luminescent dosimeter (OSLD) measurements of radiation dose to the skin over the head‐and‐neck were made during PTV delivery in CyberKnife and Tomotherapy. Individually‐calibrated OSLDs were placed on the surface of the phantom at a number of test

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