ESTRO PT 2018

Photon radiation therapy of 1950s – 1970s

• Plane radiography • Patient surface contouring devices • Educated guess of edges of tumor and organs-at-risk • Roughly shaped fields related to • Bony anatomy • Radiographical projection of contrast, fiducials or tumor • Dose calculation using transparant overlays • 2D dose-depth curves • Wide penumbra of kilovoltage, telecobalt, betatrons Techniques for accurate target volume definition could be applied for the historical niche of proton therapy indicatio s when m st of the patien s in photon therapy were treated by fields widely (wishfully) encompassing the tumours.