The efficacy of radiation therapy is highly dependent on the precision and accuracy of its delivery, as it directly influences the treatment outcomes of patients receiving this modality. As such, healthcare providers must adopt optimal radiation delivery techniques to ensure that patients receive the highest standard of care possible. Dosimetry audit is a crucial step in ensuring quality and safety in radiation therapy, both nationally and internationally. To this end, all linear accelerator machines used clinically to treat patients are subject to an on-site dosimetry audit by a team dedicated exclusively to radiotherapy audits. In this study, we audited (Level III) our in-house Monte Carlo (MC) modeling of a clinically used linear accelerator machine, performing high-accuracy 3D conformal radiation therapy (3DCRT). The present study encompasses the MC simulation of the CIRS thorax phantom model 002LFC along with multiple scenarios pertaining to eight clinical tests utilizing a 6 MV photon beam. The MCNPX code version 2.6.0 has been employed to carry out the simulations. The study results indicate that the Monte Carlo (MC) model used in the research is in good agreement with the measured data. The dose differences at all the measurement points were within the agreement criteria set by the IAEA-1583-TECDOC. This benchmarked MC model can be used to independently verify clinical 3DCRT plans.

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