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. 2021 May 21;6(6):100719. doi: 10.1016/j.adro.2021.100719

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© 2021 The Author(s)

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig 2 — Positron emission tomography (PET) images fused with computed tomography (CT) average images from 4-dimensional (4D)-CT scan. The 12 panes on the left are axial cross-sections, while the upper right pane is a sagittal cross-section and the lower right pane is a coronal cross-section. (A) Before stereotactic body radiation therapy (SBRT). Internal target volume (ITV) of right renal tumor (red) has high avidity, but normal right renal tissue has mild avidity, preventing clear delineation. Left kidney (blue) has mild diffuse avidity. (B) Three months after SBRT. The avidity of treated tumor (red) has markedly decreased.