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Diffusion and perfusion MRI radiomics obtained from deep learning segmentation provides reproducible and comparable diagnostic model to human in post-treatment glioblastoma

  • Magnetic Resonance
  • Published:
European Radiology Aims and scope Submit manuscript

Abstract

Objectives

Deep learning-based automatic segmentation (DLAS) helps the reproducibility of radiomics features, but its effect on radiomics modeling is unknown. We therefore evaluated whether DLAS can robustly extract anatomical and physiological MRI features, thereby assisting in the accurate assessment of treatment response in glioblastoma patients.

Methods

A DLAS model was trained on 238 glioblastomas and validated on an independent set of 98 pre- and 86 post-treatment glioblastomas from two tertiary hospitals. A total of 1618 radiomics features from contrast-enhanced T1-weighted images (CE-T1w) and histogram features from apparent diffusion coefficient (ADC) and cerebral blood volume (CBV) mapping were extracted. The diagnostic performance of radiomics features and ADC and CBV parameters for identifying treatment response was tested using area under the curve (AUC) from receiver operating characteristics analysis. Feature reproducibility was tested using a 0.80 cutoff for concordance correlation coefficients.

Results

Reproducibility was excellent for ADC and CBV features (ICC, 0.82–0.99) and first-order features (pre- and post-treatment, 100% and 94.1% remained), but lower for texture (79.0% and 69.1% remained) and wavelet-transformed (81.8% and 74.9% remained) features of CE-T1w. DLAS-based radiomics showed similar performance to human-performed segmentations in internal validation (AUC, 0.81 [95% CI, 0.64–0.99] vs. AUC, 0.81 [0.60–1.00], p = 0.80), but slightly lower performance in external validation (AUC, 0.78 [0.61–0.95] vs. AUC, 0.65 [0.46–0.84], p = 0.23).

Conclusion

DLAS-based feature extraction showed high reproducibility for first-order features from anatomical and physiological MRI, and comparable diagnostic performance to human manual segmentations in the identification of pseudoprogression, supporting the utility of DLAS in quantitative MRI analysis.

Key Points

Deep learning-based automatic segmentation (DLAS) enables fast and robust feature extraction from diffusion- and perfusion-weighted MRI.

DLAS showed high reproducibility in first-order feature extraction from anatomical, diffusion, and perfusion MRI across two centers.

DLAS-based radiomics features showed comparable diagnostic accuracy to manual segmentations in post-treatment glioblastoma.

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Abbreviations

3D:

Three-dimensional

ADC:

Apparent diffusion coefficient

AUC:

Area under the curve

CBV:

Cerebral blood volume

CCC:

Concordance correlation coefficient

CE-T1w:

Contrast-enhanced T1-weighted

DICE:

Dice similarity coefficient

DLAS:

Deep learning-based automatic segmentation

TP:

Tumor progression

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Funding

This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (grant number: NRF-2020R1A2B5B01001707 and NRF-2020R1A2C4001748).

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Corresponding author

Correspondence to Ho Sung Kim.

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Guarantor

The scientific guarantor of this publication is Namkug Kim.

Conflict of interest

The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

One of the authors has significant statistical expertise (Seo Young Park, 8 years of experienced statistician).

Informed consent

Written informed consent was waived by the Institutional Review Board.

Ethical approval

Institutional Review Board approval was obtained.

Study subjects or cohorts overlap

The external 33 post-treatment glioblastoma patients were in part of a previously reported study (Kim JY et al Neuro-Oncology, Volume 21, Issue 3, March 2019, Pages 404–414, https://doi.org/10.1093/neuonc/noy133). This prior article dealt with development of multiparametric MRI radiomics model using manual segmentation whereas in this manuscript we report reproducibility and accuracy from DLAS-obtained radiomics features and focused on CE-T1w imaging. The method is totally different that the previous study used feature selection in order to create the model and only 12 features were used. Meanwhile what we did here was using entire 1618 extracted features and used random forest classifier to calculate diagnostic performance, with the aim to measure the effect of segmentation to subsequent feature extraction. Also, we created the DLAS model in this study while previous report did manual segmentation.

Methodology

• retrospective

• cross-sectional study

• multicentre study

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Park, J.E., Ham, S., Kim, H.S. et al. Diffusion and perfusion MRI radiomics obtained from deep learning segmentation provides reproducible and comparable diagnostic model to human in post-treatment glioblastoma. Eur Radiol 31, 3127–3137 (2021). https://doi.org/10.1007/s00330-020-07414-3

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  • DOI: https://doi.org/10.1007/s00330-020-07414-3

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