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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 the historical niche of proton therapy
indications when most of the patients in photon therapy
were treated by fields widely (wishfully) encompassing
the tumours.