单选题
发布日期:2022-05-18
照射野是放疗相关的词汇,放疗机发出射线,通过皮肤到达患者病变部位,通过模拟机在人体表划定一个范围,身体前后左右各个方向均可以,这个划定的区域。照射野为X线束所照射的范围,照射野的大小将影响图像的对比度与光学密度。
脊髓,呈前后稍扁的圆柱体,全长粗细不等,位于椎管内,上端在枕骨大孔处与延髓相连,下端尖削呈圆锥状,称脊髓圆锥,圆锥尖端延续为一细丝,称终丝,终丝向下经骶管终于第2尾椎的背面,成人脊髓全长约42~45厘米。(概述图参考资料:)
英文翻译:width 粒子衰变宽度,不稳定粒子向前散射振幅不为零。哈密顿量不厄米,量能不是可观察量,虚部为能量不确定量。由测不准关系可知:宽度·寿命≥1(自然单位)。
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