Optical windows with external surfaces shaped to satisfy operational environment needs are known as special windows. A novel special window, a sphere-cone-polynomial （SCP） window, is proposed. The formulas of this w...Optical windows with external surfaces shaped to satisfy operational environment needs are known as special windows. A novel special window, a sphere-cone-polynomial （SCP） window, is proposed. The formulas of this window shape are given. An SCP MgF2 window with a fineness ratio of 1.33 is designed as an example. The field-of-regard （FOR） angle is ±75°. From the window system simulation results obtained with the calculated fluid dynamics （CFD） and optical design software, we find that compared to the conventional window forms, the SCP shape can not only introduce relatively less drag in the airflow, but also have the minimal effect on imaging. So the SCP window optical system can achieve a high image quality across a super wide FOR without adding extra aberration correctors. The tolerance analysis results show that the optical performance can be maintained with a reasonable fabricating tolerance to manufacturing errors.展开更多
目的 本研究旨在通过影像学资料分析、探讨上颌窦局部解剖结构的差异和相关性及其对侧壁开窗上颌窦底提升主要并发症发生的影响,为避免并发症的发生提供部分参考。方法对380名患者(男性206名,女性174名)的上颌窦影像进行锥形束CT扫描分...目的 本研究旨在通过影像学资料分析、探讨上颌窦局部解剖结构的差异和相关性及其对侧壁开窗上颌窦底提升主要并发症发生的影响,为避免并发症的发生提供部分参考。方法对380名患者(男性206名,女性174名)的上颌窦影像进行锥形束CT扫描分析,分别测量上颌窦宽度、上颌窦外侧壁与内侧壁在上颌窦底形成的角度(lateral and the medial walls with respecttothefloorofthesinus,LFM)、上颌窦外侧壁厚度、上颌窦底黏骨膜厚度、上颌窦外侧壁血管直径、剩余牙槽骨高度,并分析导致侧壁开窗上颌窦底提升并发症发生与局部解剖因素之间的相关性。结果 上颌窦宽度与LFM呈正相关,此相关性在各位点中均具有统计学意义(P<0.05)。剩余牙槽骨高度与上颌窦外侧壁厚度、血管直径与外侧壁厚度、血管直径与剩余牙槽骨高度之间呈正相关,其相关性在部分位点中具有统计学意义(P<0.05)。结论 从影像学角度出发进行研究和统计分析,发现在可能引起侧壁开窗上颌窦底提升并发症的因素中,上颌窦宽度与LFM、剩余牙槽骨高度与上颌窦外侧壁厚度、血管直径与上颌窦外侧壁厚度、血管直径与剩余牙槽骨高度具有正相关关系。展开更多
基金the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.61007009)
文摘Optical windows with external surfaces shaped to satisfy operational environment needs are known as special windows. A novel special window, a sphere-cone-polynomial （SCP） window, is proposed. The formulas of this window shape are given. An SCP MgF2 window with a fineness ratio of 1.33 is designed as an example. The field-of-regard （FOR） angle is ±75°. From the window system simulation results obtained with the calculated fluid dynamics （CFD） and optical design software, we find that compared to the conventional window forms, the SCP shape can not only introduce relatively less drag in the airflow, but also have the minimal effect on imaging. So the SCP window optical system can achieve a high image quality across a super wide FOR without adding extra aberration correctors. The tolerance analysis results show that the optical performance can be maintained with a reasonable fabricating tolerance to manufacturing errors.
文摘目的 本研究旨在通过影像学资料分析、探讨上颌窦局部解剖结构的差异和相关性及其对侧壁开窗上颌窦底提升主要并发症发生的影响,为避免并发症的发生提供部分参考。方法对380名患者(男性206名,女性174名)的上颌窦影像进行锥形束CT扫描分析,分别测量上颌窦宽度、上颌窦外侧壁与内侧壁在上颌窦底形成的角度(lateral and the medial walls with respecttothefloorofthesinus,LFM)、上颌窦外侧壁厚度、上颌窦底黏骨膜厚度、上颌窦外侧壁血管直径、剩余牙槽骨高度,并分析导致侧壁开窗上颌窦底提升并发症发生与局部解剖因素之间的相关性。结果 上颌窦宽度与LFM呈正相关,此相关性在各位点中均具有统计学意义(P<0.05)。剩余牙槽骨高度与上颌窦外侧壁厚度、血管直径与外侧壁厚度、血管直径与剩余牙槽骨高度之间呈正相关,其相关性在部分位点中具有统计学意义(P<0.05)。结论 从影像学角度出发进行研究和统计分析,发现在可能引起侧壁开窗上颌窦底提升并发症的因素中,上颌窦宽度与LFM、剩余牙槽骨高度与上颌窦外侧壁厚度、血管直径与上颌窦外侧壁厚度、血管直径与剩余牙槽骨高度具有正相关关系。
