ESTRO 2022 - Abstract Book

S20

Abstract book

ESTRO 2022

Fig. 1 Real-time distortion correction and MLC tracking workflow.

Results Fig 2A shows the target position found in cine-MRIs that are uncorrected, corrected with SH and corrected with DVF for the 15 cm location, compared to the ground truth from the motion phantom. Fig 2B shows the RMSE of tracking with each method compared to the ground truth. Both distortion correction methods had similar accuracy (average RMSE of 1.4 mm for SH and 1.4 mm for DVF) and corrected for geometric errors caused by distortion (average RMSE of 2.6 mm for uncorrected images). Distortion correction of each cine-MRI using the DVF method took 18 ms, compared to 6 s using the SH method.

Fig. 2A) Target position and B) RMSE of each method compared to the ground truth

Conclusion We have demonstrated a distortion correction method that can account for gradient field non-linearity and allow accurate target localization during beam delivery. The DVF method had similar geometric accuracy to the SH method, but the faster computation time allowed it be implemented in real-time with MLC tracking.

Symposium: Learning about the patients we do not see: A focus on inequities in radiotherapy access and provision

SP-0045 Inequalities in global access to radiotherapy services - An overview

M. Abdel-Wahab 1

1 International Atomic Energy Agency, IAEA Division of Human Health, Vienna, Austria

Abstract Text An estimated 9.6 million deaths in 2018 were attributed to cancer, making it the second leading cause of death worldwide. Left unchecked, the problem will increase to an estimated 29.5 million new cases and 16.3 million deaths occurring worldwide in 2040. Radiotherapy is a critical component of effective cancer services worldwide and a very cost-effective treatment. 50% of cancer patients need radiotherapy, however, such access is still limited, especially in low- and middle-income countries (LMIC). Many LMIC countries in spite of an increasing burden of cancer lack infrastructure, human resources, and access to