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Purpose: To evaluate the impairment of optic path caused by radiotherapy for nasopharyngeal carcinoma (NPC). Methods: Visual evoked potential was used to evaluate the functional impairment of optic path by an 8 MV linear accelerator or 60Co γ-ray radiotherapy in 63 (23 women and 40 men) patients with nasopharyngeal carcinoma before radiotherapy, at the end of radiotherapy, 6 months and 1, 2 and 3...
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