目的比较不同照射野或不同剂量分割放疗鼻咽癌的急性放射反应及后遗症。
Objective To compare the acute radiation reactions and sequelae with different radiation fields and different modes of fractionated radiotherapy for nasopharyngeal carcinoma.
结论：照射野方向和照射野的数目对剂量分布有影响，增加照射野的数目可以改善体积较大的病灶的剂量分布。
Conclusions: the beam Angle and the number of beams have influence upon dose distribution, the dose distribution would be improved for large volume target with the increment of beam number.
背景与目的：用固定野技术行特大野照射时，很难得到理想的组织剂量分布，而平移扫描式照射却能做到。
Background &Objectives:It was difficult to get a good tissued ose distribution using fixed field irradiation technique in large field. But the translating scanning beam irradiation can make it.
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