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Figure 2 | Radiation Oncology

Figure 2

From: Integrating respiratory-gated PET-based target volume delineation in liver SBRT planning, a pilot study

Figure 2

Definition of target volumes and corresponding margins. BTV: Biological Target Volume, semi-automatically determined on non-gated 150 second PET exam. CTV: clinical target volume, manually modified from the BTV to make it more accurate. PTV: manual Planning Target Volume, obtained by adding a 5 mm radial and a 10 mm craniocaudal margin. BTV phase 1: representation of the volume obtained on one phase (phase 1) of the 4D-PET. BTV phase 2: representation of the volume obtained on one phase (phase 2) of the 4D PET. BITV: Biological Internal Target Volume, volume obtained by merging the tumor volume on the six phases of the 4D PET. PTVg: gated Planning Target Volume, obtained by adding an isotropic 3 mm-margin to the BITV.

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Radiation Oncology

ISSN: 1748-717X

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