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• W2897545251 abstract "To evaluate a novel automated pipeline (AP) with an alternate deformable image registration algorithm compared to semi-automated deformable registration (SADR) to derive CBCT imaging markers (CBCTM) previously correlated to radiation pneumonitis (RP). NSCLC patients treated between 2011-2014 with curative radiation with ≥ 12 months follow-up without tumor recurrence prior to development of toxicity were included. RP (CTCAE G2+) was obtained from a prospectively collected database. Treatment plan and CBCT registrations for all treatment fractions was attempted via: (SADR) an intensity-based algorithm using the Elastix toolbox and custom pre-processing, or (AP) an intensity-based algorithm in RayStation with the CBCTM extracted in a custom image processing module. The SADR dataset was the training dataset, and extra patients extracted via AP were the validation dataset. Patient characteristics in the training/validation and correlations between CBCTM values (SADR and AP) were compared. Associations between RP, CBCTM at fractions 10 and 20 (CBCTM10, CBCTM20), average CBCTM of 5 consecutive fractions around fractions 10 and 20 (CBCTM10avg, CBCTM20avg), and dosimetric factors were evaluated using logistic regression. Model performance was evaluated using area under the receiver operating characteristic curve (AUC) analysis. Models derived from the training dataset were evaluated independently in the testing dataset. A total of 129 patients were included, with 36 patients (27.9%) having RP. 83/129 (64.3%) were successfully registered using both SADR and AP (training set). Failures were due to inconsistent data formats, convergence failure, and grossly incorrect registrations. The remaining 46 patients were successfully processed using AP (validation set). Patient characteristics including the rates of pneumonitis (26.5% vs. 31.1%) in the training and validation datasets were similar. In the training dataset: CBCTM values extracted using SADR and AP were highly correlated for both F10 and F20 (rho =0.81, 0.92, p <0.005); using either SADR or AP, mean lung dose (MLD) and CBCTM20 were associated with RP on multivariable analysis (p<0.05); CBCTM10avg and CBCTM20avg were both correlated with RP (p<0.05) on univariable and multivariable analysis; and the best performing model (CBCTM20+MLD) had an AUC of 0.679. In the validation dataset, the CBCTM20+MLD model had an AUC of 0.678. A previously validated CBCT marker of lung toxicity can be automatically derived using a different deformable image registration method, and remains correlated with RP, in addition to high correlation of marker values between the two methods. The CBCTM20 + MLD model was predictive of RP in an independent validation dataset." @default.
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• W2897545251 date "2018-11-01" @default.
• W2897545251 modified "2023-10-14" @default.
• W2897545251 title "Feasibility and Consistency of On-Treatment Cone Beam CT (CBCT) Feature Extraction Using an Automated Deformable Registration Radiomics Pipeline" @default.
• W2897545251 doi "https://doi.org/10.1016/j.ijrobp.2018.06.193" @default.
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