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. 2012 May 11;39(6):3089–3101. doi: 10.1118/1.4711909

Figure 7.

Figure 7

Dose distribution (color wash) of fields in the transverse plane of the 3-beam IMPT plan for the prostate cancer case. Toprow: beam 2 (gantry angle: 140°); bottomrow: beam 3 (gantry angle: 270°). Leftcolumn: PTV-based plan; rightcolumn: robust plan. Cyan (bottom filled area): rectum; yellow (top enclosed area): bladder; red (middle enclosed area): CTV; red solid arrows: beam directions. The PTV-based plan was generated from the IMPT-3D inverse treatment plan, which was optimized on the basis of the PTV.