Abstract
Purpose
To improve the workflow of total marrow and lymphoid irradiation (TMLI) by enhancing the delineation of organs at risk (OARs) and clinical target volume (CTV) using deep learning (DL) and atlas-based (AB) segmentation models.
Materials and methods
Ninety-five TMLI plans optimized in our institute were analyzed. Two commercial DL software were tested for segmenting 18 OARs. An AB model for lymph node CTV (CTV_LN) delineation was built using 20 TMLI patients. The AB model was evaluated on 20 independent patients, and a semiautomatic approach was tested by correcting the automatic contours. The generated OARs and CTV_LN contours were compared to manual contours in terms of topological agreement, dose statistics, and time workload. A clinical decision tree was developed to define a specific contouring strategy for each OAR.
Results
The two DL models achieved a median [interquartile range] dice similarity coefficient (DSC) of 0.84 [0.71;0.93] and 0.85 [0.70;0.93] across the OARs. The absolute median Dmean difference between manual and the two DL models was 2.0 [0.7;6.6]% and 2.4 [0.9;7.1]%. The AB model achieved a median DSC of 0.70 [0.66;0.74] for CTV_LN delineation, increasing to 0.94 [0.94;0.95] after manual revision, with minimal Dmean differences. Since September 2022, our institution has implemented DL and AB models for all TMLI patients, reducing from 5 to 2 h the time required to complete the entire segmentation process.
Conclusion
DL models can streamline the TMLI contouring process of OARs. Manual revision is still necessary for lymph node delineation using AB models.
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This work was funded by the Italian Ministry of Health, Grant AuToMI (GR-2019-12370739).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DD, NL, LC, RCB, DL, and PM The first draft of the manuscript was written by DD and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The study was conducted in accordance with the Declaration of Helsinki and approved by the Institutional Ethics Committee of IRCCS Humanitas Research Hospital (ID 2928, 26 January 2021). ClinicalTrials.gov identifier: NCT04976205.
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Dei, D., Lambri, N., Crespi, L. et al. Deep learning and atlas-based models to streamline the segmentation workflow of total marrow and lymphoid irradiation. Radiol med 129, 515–523 (2024). https://doi.org/10.1007/s11547-024-01760-8
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DOI: https://doi.org/10.1007/s11547-024-01760-8