Fig. 5From: On the pitfalls of PTV in lung SBRT using type-B dose engine: an analysis of PTV and worst case scenario concepts for treatment plan optimizationBox–plots show the phase–to–phase variations of GTV D98, D50 and D2 calculated over 13 patients for PTV and WCS–optimized plans based on GTV D50 prescription. Values of the box, whiskers, outliners and extremes are described in Fig. 2; The same 2 Gy scale is set as in Fig. 2Back to article page