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. 2022 Oct 18;13(1):224–236. doi: 10.21037/qims-22-459

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2023 Quantitative Imaging in Medicine and Surgery. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Examples for GTV and CTV. GTV is contoured in red, and CTV is contoured in purple. Each row represents MRI images for 1 patient; from left to right: T2WI, FLAIR, T1WI, and CE-T1WI. T2WI, T2-weighted imaging; FLAIR, fluid-attenuated inversion recovery; T1WI, T1-weighted imaging; CE-T1WI, contrast-enhanced T1-weighted imaging; GTV, gross tumor volume; CTV, clinical target volume; MRI, magnetic resonance imaging.