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. Author manuscript; available in PMC: 2009 Jun 13.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2007 May 21;69(2):444–453. doi: 10.1016/j.ijrobp.2007.03.018

Figure 1.

Figure 1

A proton range compensator map: (a) designed based on the radiological depth of the target’s distal edge; and (b) smeared to counter the range uncertainties. The letters indicate anterior (A), posterior (P), inferior (I) and superior (S) directions.