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. Author manuscript; available in PMC: 2016 Apr 21.
Published in final edited form as: Phys Med Biol. 2015 Mar 24;60(8):R155–R209. doi: 10.1088/0031-9155/60/8/R155

Figure 15.

Figure 15

Absorbed dose D as a function of depth z in water from a spread-out Bragg peak (SOBP) (uppermost curve) and its constituent pristine Bragg peaks (lower curves; for clarity, all but the deepest pristine Bragg peak are only partly drawn). In many cases, the clinical target volume is larger than the width of a pristine Bragg peak. By appropriately modulating the proton range and fluence of pristine peaks, the extent of the high-dose region can be widened to cover the target volume with a uniform dose.