External validation of deep learning-based contouring of head and neck organs at risk

Ellen Brunenberg*, Isabell Steinseifer, Sven van den Bosch, Johannes Kaanders, Charlotte Brouwer, Mark J Gooding, Wouter van Elmpt, Rene Monshouwer

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    Background and purpose: Head and neck (HN) radiotherapy can benefit from automatic delineation of tumor and
    surrounding organs because of the complex anatomy and the regular need for adaptation. The aim of this study
    was to assess the performance of a commercially available deep learning contouring (DLC) model on an external
    validation set.
    Materials and methods: The CT-based DLC model, trained at the University Medical Center Groningen (UMCG),
    was applied to an independent set of 58 patients from the Radboud University Medical Center (RUMC). DLC
    results were compared to the RUMC manual reference using the Dice similarity coefficient (DSC) and 95th
    percentile of Hausdorff distance (HD95). Craniocaudal spatial information was added by calculating binned
    measures. In addition, a qualitative evaluation compared the acceptance of manual and DLC contours in both
    groups of observers.
    Results: Good correspondence was shown for the mandible (DSC 0.90; HD95 3.6 mm). Performance was reasonable
    for the glandular OARs, brainstem and oral cavity (DSC 0.78–0.85, HD95 3.7–7.3 mm). The other
    aerodigestive tract OARs showed only moderate agreement (DSC 0.53–0.65, HD95 around 9 mm). The binned
    measures displayed the largest deviations caudally and/or cranially.
    Conclusions: This study demonstrates that the DLC model can provide a reasonable starting point for delineation
    when applied to an independent patient cohort. The qualitative evaluation did not reveal large differences in the
    interpretation of contouring guidelines between RUMC and UMCG observers.
    Original languageEnglish
    Pages (from-to)8-15
    Number of pages8
    JournalPhysics and Imaging in Radiation Oncology
    Volume15
    DOIs
    Publication statusE-pub ahead of print - 10-Jul-2020

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