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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 t e 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.