Spread Out Bragg Peak (SOBP)

And here’s the Google find. Note that advertising banners usually under-represent the entrance dose in hadrontherapy. A quick check is to look at the peak — if the peak is really a point, then the entrance dose at the start of the same curve is only true for a monoenergetic beam, which is not the way hadrontherapy is administered. Hadrontherapy is administered via a polyenergetic beam because tumours are hardly ever as narrow as the Bragg peak. A polyenergetic beam would produce a spread out Bragg Peak (SOBP) so that the peak adequately covers the tumour. Polyenergetic beams, when superimposed, would lead to higher entrance dose than that of a monoenergetic beam.