ESTRO 2024 - Abstract Book

S4785

Physics - Quality assurance and auditing

ESTRO 2024

Gao, J., & Liu, X. (2016). Off-isocenter Winston-Lutz test for stereotactic radiosurgery/stereotactic body radiotherapy. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 5(2), 154-161.

Graulieres, E., Kubler, S., Martin, E., & Ferrand, R. (2020). Positioning accuracy of a single-isocenter multiple targets SRS treatment: a comparison between Varian TrueBeam CBCT and Brainlab ExacTrac. Physica Medica, 80, 267-273.

Li, J., Shi, W., Andrews, D., Werner-Wasik, M., Lu, B., Yu, Y., ... & Liu, H. (2017). Comparison of online 6 degree-of-freedom image registration of Varian TrueBeam cone-beam CT and BrainLab ExacTrac X-ray for intracranial radiosurgery. Technology in cancer research & treatment, 16(3), 339-343. Ma, J., Chang, Z., Wang, Z., Wu, Q. J., Kirkpatrick, J. P., & Yin, F. F. (2009). ExacTrac X-ray 6 degree-of-freedom image-guidance for intracranial non- invasive stereotactic radiotherapy: comparison with kilo-voltage cone-beam CT. Radiotherapy and Oncology, 93(3), 602-608. Oh, S. A., Park, J. W., Yea, J. W., & Kim, S. K. (2017). Evaluations of the setup discrepancy between BrainLAB 6D ExacTrac and cone-beam computed tomography used with the imaging guidance system Novalis-Tx for intracranial stereotactic radiosurgery. PloS one, 12(5), e0177798.

Tomihara, J., Takatsu, J., Hara, N., Sugimoto, S., Shikama, N., & Sasai, K. (2022). Intracranial stereotactic radiotherapy in off-isocenter target with SyncTraX FX4. Physica Medica, 100, 105-111.

Tominaga, H., Araki, F., Shimohigashi, Y., Ishihara, T., Kawasaki, K., Kanetake, N., ... & Iwashita, Y. (2014). Accuracy of positioning and irradiation targeting for multiple targets in intracranial image-guided radiation therapy: a phantom study. Physics in Medicine & Biology, 59(24), 7753.

914

Digital Poster

Establishment of Tolerance and Action levels in IMRT/VMAT Patient Specific QA – LMIC experience

Awusi Kavuma 1 , Solomon Kibudde 1 , Tianyu Zhao 2 , Baozhou Sun 3

1 Uganda Cancer Institute, Radiation Oncology, Kampala, Uganda. 2 Washington University, Radiation Oncology, St. Louis, USA. 3 Baylor College of Medicine, Radiation Oncology, Texas, USA

Purpose/Objective:

The introduction of new radiotherapy treatment techniques in low-and-middle-income-countries (LMIC) is challenging due to a multitude of factors including limited well-trained personnel and resources, social-economic, etc. The dose calculation within the patient contains inherent uncertainties, inaccuracies, limitations, and the potential for random error. Patient-specific quality assurance (PSQA) is a crucial part of treatment that aims to catch and correct sources of mistakes for individual patients. This study aimed to assess the safety and accuracy of the dose delivery by establishing tolerance levels (TL) and action levels (AL) for the gamma index, following the commencement of IMRT and VMAT in our department. We used the MatriXX Resolution and Portal dosimetry software and followed the