SU-E-T-136: Comparison of TomoScanner™ 2D Water Phantom versus IBA Helix for Tomotherapy Profile Measurements

Medical Physics
B PatelH Wu

Abstract

To compare the differences in measured data using Tomotherapy's TomoScanner™ 2D Water Phantom versus IBA's Blue Phantom Helix taken during commissioning of the Tomotherapy HD unit. IBA Helix was used with CC04 ion chamber to measure Inline (jaw-size width), Crossline (40 cm width) and Percent Depth Dose (PDD). Data was analyzed using IBA Omni-Pro 7.3 software. Measurements were performed at 85 SSD for field sizes 5×40 cm(2) , 2.5×40 cm(2) , and 1.0×40 cm(2) . All field sizes were measured at 1.5 cm (nominal dmax), 5 cm, 10 cm and 15 cm depths. Scans were performed at a continuous speed setting of 0.5 cm/sec. Setup and data measurements were performed twice on separate occasions for consistency and repeatability. Data measurements were normalized to 10 cm depth and compared to commissioning data taken from TomoScanner™ and Tomotherapy's Twinning Data. For all jaws, the profiles measured at 5 cm, 10 cm, and 15 cm depth using IBA Helix matched the profiles of the TomoScanner™ data within 1%. Profile variance at 1.5 cm depth showed a deviation of up to 3%. For all jaws, the PDD comparisons displayed 3-5% deviation from the surface to 2 cm depth and within 1% deviation at 2 cm to 15 cm depth. Measurements performed using CC04 ion ch...Continue Reading

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