ESTRO 2024 - Abstract Book

S3357

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Figure 1. Average results for gamma comparison analysis per anatomical site. Data were collected with the Octavius 1500MR array and 4D phantom. Nominal pass values of 95% and 90% [7-9] are shown.

Conclusion:

The new MR-compatible Octavius detectors and 4D phantom are suitable for QA of patient treatment plans in a 1.5T MRI-linac, and can successfully differentiate between standard plans and plans with errors.

Keywords: Octavius, MR-linac, Plan QA

References:

[1] A. Van Esch, K. Basta, M. Evrard, M. Ghislain, F. Sergent, and D. P. Huyskens, “The octavius1500 2d ion chamber array and its associated phantoms: Dosimetric characterization of a new prototype,” Medical physics, vol. 41, no. 9, p. 091708, 2014.

[2] T. S. Stelljes, A. Harmeyer, J. Reuter, H. K. Looe, N. Chofor, D. Harder, and B. Poppe, “Dosimetric characteristics of the novel 2d ionization chamber array octavius detector 1500,” Medical physics, vol. 42, no. 4, pp. 1528–1537, 2015.

[3] B. L.-K. Nicole Brand, Christian Albrecht, “Quality assurance with octavius detector 1600 srs at the cyberknife,” https://www.ptwdosimetry.com.

[4] I. Olaciregui-Ruiz, B. Vivas-Maiques, J. Kaas, T. Perik, F. Wittkamper, B. Mijnheer, and A. Mans, “Transit and non transit 3d epid dosimetry versus detector arrays for patient specific qa,” Journal of Applied Clinical Medical Physics, vol. 20, no. 6, pp. 79–90, 2019. [5] D. Monnich, J. Winter, M. Nachbar, L. K unzel, S. Boeke, C. Gani, O. Dohm, D. Zips, and D. Thorwarth, “Quality assurance of imrt treatment plans for a 1.5 t mr-linac using a 2d ionization chamber array and a static solid phantom,” Physics in Medicine & Biology, vol. 65, no. 16, p. 16NT01, 2020.