ESTRO 2024 - Abstract Book

S5994

RTT - Treatment planning, OAR and target definitions

ESTRO 2024

showing a lower actual V38Gy than predicted were identified. Offline replanning of those outliers resulted in an average increase of 7.4 % for V38Gy without exceeding the OAR constraints.

Figure 2: The scatter plot visually compares the predicted V38Gy values against the actual V38Gy values. Regression line is depicted in red, serving as a reference for perfect prediction. The green dashed line delineates the lower boundary. Data points are represented as blue dots, and the region below the green boundary is shaded to emphasize values falling outside the prediction range showing a lower actual V38Gy than predicted.

Conclusion:

Target coverage was shown to be statistically correlated with the volume of OARs within 2cm and their overlap with the PTV. An upfront dose target coverage prediction model was created which can aid in the clinical review of online adaptive planning in MRIgRT for pancreatic tumors.

Keywords: MRIgRT, pancreas cancer, online adaptive

2029

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Optimizing Brain OAR Segmentation in Radiotherapy with MIM Autocontouring Software