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. 2021 Apr 17;29:106–112. doi: 10.1016/j.ctro.2021.04.003

Fig. 5.

Fig. 5

Comparison of volumes used for ITV-based RT, such as SBRT (left) and BgRT (right). IM-internal margin, SM – setup margin, GTV – gross tumor volume, CTV – clinical target volume, ITV – internal target volume, PTV – planning target volume, BgM – biology – guidance margin, and BTZ-biology tracking zone.