Basic Treatment Planning

2D vs. 3D Treatment Planning • 2D planning: • Single patient contour • Volumes and dose drawn (calculated) on a single transverse contour through central axis. • Simulation (Radiographs) to determine SSD, field size (and depth of volumes) • 2D planning and 3D calculation: • Patient contour in 3D • Dose calculated in 3D (tissue inhomogenity taken into account)

• 3D planning (3DCRT): • Delineation of volumes • Use of dose-volume histogram

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