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Fig. 4 | Radiation Oncology

Fig. 4

From: Impact of four-dimensional cone-beam computed tomography on target localization for gastric mucosa-associated lymphoid tissue lymphoma radiotherapy: reducing planning target volume

Fig. 4

Representative images (patient number 4) of the positional discrepancy between target localization methods based on skin matching (a), bone matching (b), and 4D soft-tissue matching (c) using 4D-CBCT. A PTV structure of 15 mm (yellow) margin from the CTV defined based on the 4D-CT (CTV-4D) is displayed in the 4D-CBCT images. Target localization by skin and bone matching could not cover the entire stomach in the PTV (a, b). Target localization by 4D soft-tissue matching was able to cover the entire stomach in the PTV (c)

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