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. 2015 Jul 2;42(8):4449–4459. doi: 10.1118/1.4923179

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© 2015 Am. Assoc. Phys. Med.

0094-2405/2015/42(8)/4449/11/$30.00

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FIG. 3. — 2D proton WEPL difference maps (absolute) calculated between the CT_ref and CBCT images. The WEPL comparison was performed at the phantom midplane perpendicular to the incident beam. Difference shown between [(a)–(d)] CT_ref and CBCT_raw; [(e)–(h)] CT_ref and CBCT_us; [(i)–(l)] CT_ref and CBCT_ap. Columns 1 and 2: lateral and anterior beam simulations on a pelvis phantom; columns 3 and 4: lateral and anterior beam simulations on a thorax phantom.