Influence of beamlet width on dynamic IMRT plan quality in nasopharyngeal carcinoma.

Both compared with BL04 mm group respectively, doses to the optic chiasm between the BL06 mm and BL08 mm groups significantly increased ( p = 0.021, p = 0.004), while the plan with beamlet widths of two mm and 10 mm did not reach statistical significance.

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