Knowledge-based tradeoff hyperplanes for head-and-neck treatment planning.

Knowledge-based tradeoff hyperplanes for head-and-neck treatment planning.:

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Knowledge-based tradeoff hyperplanes for head-and-neck treatment planning.

Int J Radiat Oncol Biol Phys. 2020 Jan 23;:

Authors: Zhang J, Ge Y, Sheng Y, Wang C, Zhang J, Wu Y, Wu Q, Yin FF, Wu QJ

Abstract

PURPOSE: To develop a tradeoff hyperplane model to facilitate tradeoff decision-making before inverse planning.

METHODS AND MATERIALS: We propose a model-based approach to determine the tradeoff hyperplanes that allow physicians to navigate the clinically viable space of plans with best achievable dose-volume parameters before planning. For a given case, a case reference set (CRS) is selected using a novel anatomical similarity metric from a large reference plan pool. Then, a regression model is built on the CRS to estimate the expected dose-volume histograms (DVHs) for the current case. This model also predicts the DVHs for all CRS cases and captures the variation from the corresponding DVHs in the clinical plans. Finally, these DVH variations are analyzed using the principal component analysis to determine the tradeoff hyperplane for the current case. To evaluate the effectiveness of the proposed approach, 244 head-and-neck cases were randomly partitioned into reference (214) and validation (30) sets. A tradeoff hyperplane was built for each validation case and evenly sampled for 12 tradeoff predictions. Each prediction yielded a tradeoff plan. The root-mean-squared-errors (RMSEs) of the predicted and the realized plan DVHs were computed for prediction achievability evaluation.

RESULTS: The tradeoff hyperplane with three principal directions accounts for 57.8%±3.6% of variations in the validation cases, suggesting the hyperplanes capture a significant portion of the clinical tradeoff space. The average RMSE in three tradeoff directions are 5.23±2.46, 5.20±2.52, and 5.19±2.49, as compared to 4.96±2.48 of the KBP predictions, indicating that the tradeoff predictions are comparably achievable.

CONCLUSIONS: Clinically relevant tradeoffs can be effectively extracted from existing plans and characterized by a tradeoff hyperplane model. The hyperplane allows physicians and planners to explore the best clinically achievable plans with different OAR sparing goals before inverse planning and is a natural extension of the current KBP framework.

PMID: 31982497 [PubMed - as supplied by publisher]