Abstract
Objectives
To assess the precision of MRI radiomics features in hepatocellular carcinoma (HCC) tumors and liver parenchyma.
Methods
The study population consisted of 55 patients, including 16 with untreated HCCs, who underwent two repeat contrast-enhanced abdominal MRI exams within 1 month to evaluate: (1) test–retest repeatability using the same MRI system (n = 28, 10 HCCs); (2) inter-platform reproducibility between different MRI systems (n = 27, 6 HCCs); (3) inter-observer reproducibility (n = 16, 16 HCCs). Shape and 1st- and 2nd-order radiomics features were quantified on pre-contrast T1-weighted imaging (WI), T1WI portal venous phase (pvp), T2WI, and ADC (apparent diffusion coefficient), on liver regions of interest (ROIs) and HCC volumes of interest (VOIs). Precision was assessed by calculating intraclass correlation coefficient (ICC), concordance correlation coefficient (CCC), and coefficient of variation (CV).
Results
There was moderate to excellent test–retest repeatability of shape and 1st- and 2nd-order features for all sequences in HCCs (ICC: 0.53–0.99; CV: 3–29%), and moderate to good test–retest repeatability of 1st- and 2nd-order features for T1WI sequences, and 2nd-order features for T2WI in the liver (ICC: 0.53–0.73; CV: 12–19%). There was poor inter-platform reproducibility for all features and sequences, except for shape and 1st-order features on T1WI in HCCs (CCC: 0.58–0.99; CV: 3–15%). Good to excellent inter-observer reproducibility was found for all features and sequences in HCCs (CCC: 0.80–0.99; CV: 4–15%) and moderate to good for liver (CCC: 0.45–0.86; CV: 6–25%).
Conclusions
MRI radiomics features have acceptable repeatability in the liver and HCC when using the same MRI system and across readers but have low reproducibility across MR systems, except for shape and 1st-order features on T1WI. Data must be interpreted with caution when performing multiplatform radiomics studies.
Key Points
• MRI radiomics features have acceptable repeatability when using the same MRI system but less reproducible when using different MRI platforms.
• MRI radiomics features extracted from T1 weighted-imaging show greater stability across exams than T2 weighted-imaging and ADC.
• Inter-observer reproducibility of MRI radiomics features was found to be good in HCC tumors and acceptable in liver parenchyma.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- CCC:
-
Concordance correlation coefficient
- CV:
-
Coefficient of variation
- GLCM:
-
Gray-level co-occurrence matrix
- GLDM:
-
Gray-level dependence matrix
- GLRLM:
-
Gray-level run length matrix
- GLSZM:
-
Gray-level size zone matrix
- HCC:
-
Hepatocellular carcinoma
- IBSI:
-
Image Biomarker Standardization Initiative
- ICC:
-
Intraclass correlation coefficient
- NGTDM:
-
Neighboring gray tone difference matrix
- QIB:
-
Quantitative imaging biomarker
- QIBA:
-
Quantitative Imaging Biomarkers Alliance
- ROI:
-
Region of interest
- T1WIpre:
-
T1-weighted imaging pre-contrast
- T1WIpvp:
-
T1-weighted imaging portal venous phase
- T2WI:
-
T2-weighted imaging
- TE:
-
Echo time
- TR:
-
Repetition time
- VOI:
-
Volume of interest
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Funding
This study has received funding by NCI U01 CA172320.
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The scientific guarantor of this publication is Bachir Taouli.
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
No complex statistical methods were necessary for this paper.
Informed consent
Written informed consent was obtained from 16 prospectively recruited patients as part of the NCI U01 CA172320. Written informed consent was waived by the Institutional Review Board for the rest of the cohort.
Ethical approval
Institutional Review Board approval was obtained.
Study subjects or cohorts overlap
Data from 16 patients have been previously reported in Bane-2016, Hectors-2016, Hectors-2017, and Jajamovich-2016.
Methodology
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Retrospective
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Observational
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Performed at one institution
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Carbonell, G., Kennedy, P., Bane, O. et al. Precision of MRI radiomics features in the liver and hepatocellular carcinoma. Eur Radiol 32, 2030–2040 (2022). https://doi.org/10.1007/s00330-021-08282-1
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DOI: https://doi.org/10.1007/s00330-021-08282-1