Gastric fundus disease was further diagnosed by method of U-type reverse gastroscope biopsy a reflecting telescope with an off-axis reflector. U型反转胃镜法活检能够提高胃底病变的检出率带有远轴反射镜的反射望远镜。
In this paper, geometrical optical properties of off-axis fed parabolic cylinder reflector are discussed, and the geometrical optical objective function is proposed. 本文讨论了线源对抛物柱面偏焦馈电的几何光学性质,提出了一种判断最优化的几何光学评价函数,计算了最优馈源位置随天线口径尺寸和波束指向角变化的规律。