Physics Research International / 2012 / Article / Fig 16

Research Article

A New Technology for Fast Two-Dimensional Detection of Proton Therapy Beams

Figure 16

Fourier transform of uniform-scanning delivery data. We measured the fundamental frequencies to be 6.2291 and 62.29 Hz. The beam scanning frequencies are one-half these values, because the beam passes the collimator hole twice per scan cycle.