21 Axial view of a volumetric arc therapy (VMAT) treatment plan for prostate cancer delivered with RapidArc, with SIB to DILs. UROLOGY, URO-ONCOLOGY AND SEXOLOGY UPDATE Example of shrinking 4-eld box treatment planning technique + 2 lateral beams for delivery of a total prescribed dose of 78 Gy to the prostate. Structures shown are CTV (dark blue), CTV (pink), PTV (green), PTV66 Gy (red), prostate seminal vesicles 70 Gy PTV (light blue), rectum (green), femoral heads (black), pubic bone (black), and sacrum (black). Treatment plans 50 Gy (prescribed doses): Phase 1 (50 Gy; solid white eld borders), phase 2 (16 Gy; dashed), phase 3 (4 Gy; dotted), and phase 4 (lateral beams only; 8 Gy; dashed-dotted). Field borders are drawn without divergence for clarity. Abbreviations: CTV = clinical target volume; PTV = planning target volume.
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