MR-based CT metal artifact reduction for head-and-neck photon, electron, and proton radiotherapy.

5 (b) are nonsignificantly negative for the phantom while the patient results are significant for photons and highly significant for electrons/protons at ∆ R 90 = 1 . 9 ± 0 . 3 and ∆ R 80 = 3 . 0 ± 0 . 4 mm, respectively; photons show a smaller, less significant variation at ∆ S max = 1 . 2 ± 0 . 4 mm. 4.2.

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In the patients, positive significant differences are observed in δN high for the oral cavity and teeth, with almost significantly negative ∆ δN low for the teeth.

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