Abstract
Purpose Validate the dose for Gated RapidArc (RA) treatment technique using portal imaging dosimetry aSi1000. Methods and materials 5 cases of liver stereotactic gated treatments were selected. RA plans were optimized using the Eclipse TPS (v.10) and the PRO3 (v.) algorithm. Verification of treatment plans was performed using an Electronic Portal Imaging Dose (EPID). Portal Dose Prediction algorithm was used to predict the dose at the isocenter. Gated RA treatments were performed using a Varian Novalis TrueBeam linear accelerator. The portal dose images were acquired with a portal imager aSi1000. A respiratory gating signal was generated using a phantom using infrared reflective markers providing a periodic movement. The measurements were performed with respiratory gating in the same conditions of treatment and compared with portal images acquired without gating and both were then compared to images of dose predicted by the TPS. Quantitative analysis of the consistency of dose distributions was performed using the gamma index. Criteria 2 mm in distance (DTA Distance To Agreement) and 2% in dose difference (DDmax) and 3 mm/3% were selected for the evaluation. Results The average gamma index <1 obtained for plans with Gated RA compared with images dose predicted by the TPS is 97.25% (±2.32) for 2 mm DTA criteria and 2% DD and 98.95% (±1.10) for 3 mm DTA criteria and 3% in DD. The average index for gamma RA plans without gating compared to images of dose predicted by the TPS is 97.16% (±2.46) for 2 mm DTA and DD 2% and 98.92% (±1.13) for 3 mm/ 3%.Comparison of images dose acquired with and without gating is 100% (±0) for 2 mm in DTA and 2% in DD as well as 3 mm/3%. Conclusion The dose for RA treatment technique with and without respiratory gating shows a very good agreement. The portal imager aSi1000 can be used as a tool for verification of Gated RA treatment plans. Validate the dose for Gated RapidArc (RA) treatment technique using portal imaging dosimetry aSi1000. 5 cases of liver stereotactic gated treatments were selected. RA plans were optimized using the Eclipse TPS (v.10) and the PRO3 (v.) algorithm. Verification of treatment plans was performed using an Electronic Portal Imaging Dose (EPID). Portal Dose Prediction algorithm was used to predict the dose at the isocenter. Gated RA treatments were performed using a Varian Novalis TrueBeam linear accelerator. The portal dose images were acquired with a portal imager aSi1000. A respiratory gating signal was generated using a phantom using infrared reflective markers providing a periodic movement. The measurements were performed with respiratory gating in the same conditions of treatment and compared with portal images acquired without gating and both were then compared to images of dose predicted by the TPS. Quantitative analysis of the consistency of dose distributions was performed using the gamma index. Criteria 2 mm in distance (DTA Distance To Agreement) and 2% in dose difference (DDmax) and 3 mm/3% were selected for the evaluation. The average gamma index <1 obtained for plans with Gated RA compared with images dose predicted by the TPS is 97.25% (±2.32) for 2 mm DTA criteria and 2% DD and 98.95% (±1.10) for 3 mm DTA criteria and 3% in DD. The average index for gamma RA plans without gating compared to images of dose predicted by the TPS is 97.16% (±2.46) for 2 mm DTA and DD 2% and 98.92% (±1.13) for 3 mm/ 3%.Comparison of images dose acquired with and without gating is 100% (±0) for 2 mm in DTA and 2% in DD as well as 3 mm/3%. The dose for RA treatment technique with and without respiratory gating shows a very good agreement. The portal imager aSi1000 can be used as a tool for verification of Gated RA treatment plans.
Published Version
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