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1 Polish Journal of Medical Physics and Engineering

1 2024

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Commissioning, dosimetric characterisation and machine performance assessment of the AQURE mobile accelerator for intraoperative radiotherapy

Ryczkowski Adam, Pawałowski Bartosz, Kruszyna-Mochalska Marta, Misiarz Agnieszka, Lenartowicz-Gasik Aleksandra, Wosicki Maksymilian, Jodda Agata, Adrich Przemysław, Piotrowski Tomasz

Polish Journal of Medical Physics and Engineering

2024

Vol. 30, Iss. 3

177--181

Introduction: The AQURE is a recently designed mobile linear accelerator for intraoperative electron radiotherapy (IOERT). In the study, we assess, report, and compare the dosimetric characteristics obtained during the commissioning of this machine in our Centre. Material and Methods: The electron energies of the AQURE used in this study are 4, 6, 9 and 12 MeV. The diameters of the cylindrically shaped applicators range from 4 to 10 cm. The measurements were performed (a) by microDiamond detector in a BeamScan water phantom (depth dose distributions, flatness and symmetry of dose profiles, output constancy and linearity) and (b) by Farmer ionisation chamber in a solid water phantom (output related to gantry angle). The results of measurements were compared to analogous results from other IOERT accelerators and were evaluated in the light of scientific recommendations and legal regulations. Results: The values of the measured parameters fit the recommended ranges. The profiles and the depth dose distributions are close to literature data for other IOERT machines. Any differences between them are caused by the detailed technical solutions which influence the final shape of the obtained dose distributions. The values of mean and most probable energies suggest that the electron beams used during IOERT cannot be considered mono-energetic. We believe that the energy spectrum should be researched and described for each IOERT mobile accelerator before clinical usage. Conclusion: The measurements confirm the dosimetric accuracy of the AQURE accelerator under the literature guidelines.