Abstract
Six base of skull IMRT treatment plans were delivered to Presage dosimeters within the RPC Head and Neck Phantom for quality assurance (QA) verification. Isotropic 2mm 3D data were acquired by optical-CT scanning with the DLOS system (Duke Large Optical-CT Scanner) and compared to the Eclipse (Varian) treatment plan. Normalized Dose Distribution (NDD) pass rates were obtained for a number of criteria. High quality 3D dosimetry data was observed from the DLOS system, illustrated here through colormaps, isodose lines, and profiles. Excellent agreement with the planned dose distributions was also observed with NDD analysis revealing > 90% pass rates (with criteria 3%, 2mm), and noise < 0.5%. The results comprehensively confirm the high accuracy of base-of-skull IMRT treatment in our clinic.
Highlights
The accuracy of base-of-skull (BOS) IMRT treatment was evaluated in six patients treated at Duke between 2008 and 2011
Particular attention is paid to investigating the quality of the 3D dosimetry data acquired with the DLOS system [3], and on a detailed comparison of the 3D measured and calculated (Eclipse) distributions
2.1. 3D IMRT quality assurance (QA) Data Acquisition 3D dose measurements were performed with cylindrical PRESAGE® dosimeters (10cm diameter, 12cm long) which were compatible with the RPC head-and-neck IMRT credentialing phantom [4]
Summary
The accuracy of base-of-skull (BOS) IMRT treatment was evaluated in six patients treated at Duke between 2008 and 2011. A condensed summary analysis was presented in Oldham et al [1], which focused on evaluating the clinical significance of 3D verification QA data after transform back to the patients CT data set [2]. The current work compliments this analysis by focusing on a direct dosimetry comparison, measured to calculated, in the RPC head phantom geometry. Particular attention is paid to investigating the quality of the 3D dosimetry data acquired with the DLOS system [3], and on a detailed comparison of the 3D measured and calculated (Eclipse) distributions
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