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Open Access 06-11-2024 | Glioma | Original Article

The Segment Anything foundation model achieves favorable brain tumor auto-segmentation accuracy in MRI to support radiotherapy treatment planning

Authors: PD Dr. Florian Putz, Sogand Beirami, Manuel Alexander Schmidt, Matthias Stefan May, Johanna Grigo, Thomas Weissmann, Philipp Schubert, Daniel Höfler, Ahmed Gomaa, Ben Tkhayat Hassen, Sebastian Lettmaier, Benjamin Frey, Udo S. Gaipl, Luitpold V. Distel, Sabine Semrau, Christoph Bert, Rainer Fietkau, Yixing Huang

Published in: Strahlentherapie und Onkologie

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Abstract

Background

Promptable foundation auto-segmentation models like Segment Anything (SA, Meta AI, New York, USA) represent a novel class of universal deep learning auto-segmentation models that could be employed for interactive tumor auto-contouring in RT treatment planning.

Methods

Segment Anything was evaluated in an interactive point-to-mask auto-segmentation task for glioma brain tumor auto-contouring in 16,744 transverse slices from 369 MRI datasets (BraTS 2020 dataset). Up to nine interactive point prompts were automatically placed per slice. Tumor boundaries were auto-segmented on contrast-enhanced T1w sequences. Out of the three auto-contours predicted by SA, accuracy was evaluated for the contour with the highest calculated IoU (Intersection over Union, “oracle mask,” simulating interactive model use with selection of the best tumor contour) and for the tumor contour with the highest model confidence (“suggested mask”).

Results

Mean best IoU (mbIoU) using the best predicted tumor contour (oracle mask) in full MRI slices was 0.762 (IQR 0.713–0.917). The best 2D mask was achieved after a mean of 6.6 interactive point prompts (IQR 5–9). Segmentation accuracy was significantly better for high- compared to low-grade glioma cases (mbIoU 0.789 vs. 0.668). Accuracy was worse using the suggested mask (0.572). Stacking best tumor segmentations from transverse MRI slices, mean 3D Dice score for tumor auto-contouring was 0.872, which was improved to 0.919 by combining axial, sagittal, and coronal contours.

Conclusion

The Segment Anything foundation segmentation model can achieve high accuracy for glioma brain tumor segmentation in MRI datasets. The results suggest that foundation segmentation models could facilitate RT treatment planning when properly integrated in a clinical application.
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Metadata
Title
The Segment Anything foundation model achieves favorable brain tumor auto-segmentation accuracy in MRI to support radiotherapy treatment planning
Authors
PD Dr. Florian Putz
Sogand Beirami
Manuel Alexander Schmidt
Matthias Stefan May
Johanna Grigo
Thomas Weissmann
Philipp Schubert
Daniel Höfler
Ahmed Gomaa
Ben Tkhayat Hassen
Sebastian Lettmaier
Benjamin Frey
Udo S. Gaipl
Luitpold V. Distel
Sabine Semrau
Christoph Bert
Rainer Fietkau
Yixing Huang
Publication date
06-11-2024
Publisher
Springer Berlin Heidelberg
Published in
Strahlentherapie und Onkologie
Print ISSN: 0179-7158
Electronic ISSN: 1439-099X
DOI
https://doi.org/10.1007/s00066-024-02313-8