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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 11:23 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Biophysics; Medical Physics
Title:
Comparison of two detector array solutions
for radiosurgery patient specific quality assurance
Authors:
Mihai Daniel SUDITU (1), Alexandru Daniel OLĂRESCU (1,2), Cosmin Marian MIU (1), Loredana Elena MILITARU (1,2),
Alexandru OPREA (1)
*
Affiliation:
1) Amethyst Radiation Therapy Center, Bucharest
2) Faculty of Physics, University of Bucharest
E-mail
suditu.mihai@yahoo.com
Keywords:
radiation therapy, radiosurgery, patient specific quality assurance;
Abstract:
Linac based radiosurgery has evolved substantially and has become a viable solution for treating brain metastases. Because of very high complexity of radiosurgery treatments, the patient specific quality assurance process is a mandatory and complex step and the selection of proper detector array is crucial.
Purpose: The purpose of this work is to compare two commercially available patient specific quality assurance devices, with different detector arrays: PTW Octavius 4D with SRS1000 detector matrix and SunNuclear SRSMapCheck.
Material and method: A radiosurgery treatment plan was made for a group of five patients with single brain metastases, using Philips Pinnacle treatment planning system. The plans were delivered using Elekta VersaHD linac with Agility Collimator equipped with flattening filter free beam. The dose delivered to target was in the rage of 18-20 Grays using a single treatment fraction.
Results: Both devices showed good agreement between the calculated dose distribution and measured dose, for all plans the gamma analysis passing rate for both 2 percent dose difference, 2 mm distance to agreement and 3 percent dose difference, 1 mm distance to agreement was higher than 95%.
Conclusions: Both devices present a viable solution for radiosurgery specific quality assurance with the mention that SRS 1000 detectors have high dose rate dependence that needs to be taken into account, requiring more steps during measurements and cannot be used for measuring non coplanar beams.
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