固定在支架左边的是光学追踪器，它与固定在前下方的碟形毫米波控制系统连接。
Mounted on the left side of the pedestal is the optical tracker with the dish-type millimetre-wave command link being mounted forward and below.
目的评价开放式MR扫描仪结合光学追踪系统行椎间盘造影术操作方法的可行性及安全性。
Objective To evaluate the feasibility and safety of lumbar disc discography carried out in an open MR scanner with an optical tracking system.
涵盖的主题包括：几何光学射线追踪，畸变，镜头设计，孔径和停止，辐射计和光度法。
Topics covered in geometrical optics include: ray-tracing, aberrations, lens design, apertures and stops, radiometry and photometry.
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