Figure 5.

Realistic, in-vivo distal fall-offs for proton therapy. (a) For a single lateral field to a skull base chordoma. Note the extreme degradation of fall-off at the distal end due to density heterogeneities in the patient. (b–d). Example distal fall-offs to through different slices of the same sacral chordoma case. Note, all fall-offs are considerably larger than the distal fall-off shown in Figure 1.