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当两个照射野相邻照射时，两野的相接常取在中平面或危险器官部位，这种方法的剂量分布常常在相接点的下方或上方存在热点或冷点。直线加速器独立准直器的应用，使用不对称照射野行相邻野照射，则使冷点或热点降至最小，这是独立准直器的一项功能。尤其对于已行单野照射，又
When the two irradiation fields are irradiated adjacent to each other, the connection between the two fields is often taken in midplane or in dangerous organs. The dose distribution of this method often has hot spots or cold spots below or above the contact points. The use of linear accelerator independent collimators, using asymmetrical illumination of adjacent fields of field exposure, minimizes cold spots or hot spots, a feature of standalone collimators. Especially for single field irradiation, again