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. 2019 May 1;5(4):23–31. doi: 10.14338/IJPT-18-00041.1

Figure 4.

Figure 4.

Correlation of V70 values with mean displacement for plans created with and without a spacer in place. This displacement was calculated by using the average of minimum displacements between anterior rectum to BP, anterior rectum to MP, and anterior rectum to AP. The plans shown include PSPT−HG (dark blue), IMPT−HG (light blue), PSPT+HG (orange), and IMPT+HG (brown). The dashed line represents the rectal dose constraint at V70 (15%). Abbreviations: AP, prostate apex; BP, prostate base; HG, hydrogel spacer; IMPT, intensity-modulated proton therapy; MP, prostate midgland; PSPT, passive scattering proton therapy.