Resumo de eventos cient??ficos
Comparison between AAA and ACUROS XB calculation algorithms for VMAT treatment planning of brain multiple metastases using osl dosimetry
Autor
VILLANI, DANIEL
MORENO, CAROLINA dos S.
GONCALVES, VINICIUS D.
SAKURABA, ROBERTO K.
CAMPOS, LETICIA L.
INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th
Resumen
The ???Alabama Technique??? demonstrates plan quality and provide a practical, systematic
approach to the treatment planning technique for single isocenter cranial radiosurgery
with volumetric modulated arc therapy (VMAT) used in metastatic carcinoma
treatments. The Optically Stimulated Luminescence dosimetry has become one of most
used techniques for radiation dosimetry now days, especially after the improvement of
Landauer???s Luxel??? and creation of Landauer???s Inlight???System, initially for individual
monitoring radiation protection, and now it has been tested and validated for radiation
therapy dosimetry with good results. This work aims to compare Varian AAA and
Acuros XB dose calculation algorithms for treatment planning of multiple brain
metastases using ???Alabama Technique??? with a 3D printed anthropomorphic phantom
and the OSL InLightTM system for dosimetric validation. An anthropomorphic skull 3D
printed phantom was submitted to a CT scan and planed five target volumes. In order of
comparison, two dose calculations were performed in the Varian Eclipse with VMAT
planning with "Alabama technique", using the Varian???s AAA and Acuros XB and
treatment was delivered with a VARIAN True Beam linear accelerator with Multileaf
Collimator HD and 6 MV photon beam were used. Landauer nanoDot dosimeters were
positioned inside each of the five target volumes planned and the experimental
dosimetric results were compared with the two calculation algorithms. The experimental
results using the OSLDs show agreement of 97.26 %, 99.12 %, 99.99 %, 95.94 % %
and 98.79 % for the targets 1 to 5 respectively for the ACUROS XB calculated
doses.The findings of this work indicate that ACUROS XB calculates more accurate
doses compared with AAA, with all the experimental agreements better than 96 %. The
intrinsic precision and uncertainty of the InLight system device is sufficient to sustain the
dosimetric uncertainties below 2 %, validating the results.