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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. 1. — Axial views of the CT_ref and CBCT images of three phantoms and a patient. Display window is [1000–200] for all images. [(a)–(d)] CT_ref images; [(e)–(h)] uncorrected CBCT images; [(i)–(l)] CBCT_us images; [(m)–(p)] CBCT_ap images. The CBCT_ap demonstrated comparable HU accuracy and uniformity to the CT_ref, while the CBCT_raw and CBCT_us showed shading artifacts and image heterogeneities.