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Fig. 1 | Radiation Oncology

Fig. 1

From: Impact of planning organ at risk volume margins and matching method on late gastrointestinal toxicity in moderately hypofractionated IMRT for locally advanced pancreatic ductal adenocarcinoma

Fig. 1

An example showing the differences between Protocols A and B

The red shading represents the GTV, and the red line represents the PTV. The PRV (planning organs at risk volume) margin was 10 mm for the stomach and 5 mm for the duodenum in Protocol A (a) and 5 mm for the stomach and 3 mm for the duodenum in Protocol B (b). Alignment was determined using (a) soft tissue and (b) VISICOIL. In both protocols, 48 Gy was prescribed for D95% of PTV minus PRV, whereas D98% of PTV was 36 Gy or more.

GTV, gross tumour volume; PRV, planning organs at risk volume; CTV, clinical target volume; PTV, planning target volume

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Radiation Oncology

ISSN: 1748-717X

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