UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 1:45
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Conference: Bucharest University Faculty of Physics 2024 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
The influence of the linear accelerator and beam scanning system mechanical components in relative dose measurements


Authors:
Mihai-Stefan BARHALA (1,2), Tia POPESCU(1,2)


*
Affiliation:
1)Neolife Bucharest, Romania

2)University of Bucharest, Physics, Romania


E-mail
mihai.barhala@gmail.com


Keywords:
Relative Dose Measurements, Linear Accelerator, Beam Scanning System, Measurement errors, Measurement uncertainty


Abstract:
Due to the tolerances given by the LINAC producer regarding the variability of mechanical movements, this work is focused on the influences of the mechanical components position in relative dose measurements such as PDDs and dose profiles [1]. Those measurements represent an essential role in modelling the radiation beam accurately in the TPS, such that the radiation therapy treatments can be delivered as intended. Another important factor that can influence the measurement quality, besides the one stated above, is the beam scanning system itself. This system must be checked properly so that the measured data can be trusted as intended. This includes the accuracy of movement via the three direction individual motors that control the position of the detector. Besides analyzing the interdependence of mechanical and dosimetric components, one of the main aspects of this work is to estimate the measurement uncertainty itself by statistical means [2] and to provide a practical workflow to be performed prior to starting the dosimetric measurements


References:

[1] Létourneau, D., Keller, H., Becker, N., Amin, M. N., Norrlinger, B., & Jaffray, D. A. (2018). Quality control methods for linear accelerator radiation and mechanical axes alignment. Medical physics, 45(6), 2388-2398.

[2] Buliński, Krzysztof, et al. "Uncertainties in the measurement of relative doses in radiotherapy." Polish Journal of Medical Physics and Engineering 27.1 (2021): 1-9