投影式头戴静脉显像光学系统的设计

为了辅助静脉穿刺及相关的医疗操作, 设计了一款基于投影式头戴显示器(HMPD)的静脉显像系统, 其光学系统由近红外成像系统和穿透型HMPD构成。利用光学设计软件ZEMAX优化设计近红外成像系统, 使其具有F/2.6的大数值孔径, 有利于弱反射红外光的收集成像。穿透型HMPD采用与近红外成像系统相同的光学结构, 有利于简化系统的加工装调。设计结果表明, 近红外成像系统成像质量优异, 分辨率达到QXGA(2 048×1 536)。穿透型HMPD具有18 mm的大出瞳直径及25 mm的大出瞳距离, 场曲小于0.03 D, 畸变小于0.32%, 达到QXGA分辨率显示模式。与现行的静脉显像系统相比, 本显像系统结构简单紧凑、佩戴舒适, 且具有超高分辨率, 是一款适用于辅助医疗的目视系统。

Optical system design of the head-mounted projective display for vein imaging

In order to assist venipuncture and related medical operations, a novel vein imaging device based on head-mounted projective display(HMPD) is designed. The correspondent optical system consists of near-infrared imaging system and see-through HMPD. With the help of optical design software ZEMAX, the near-infrared imaging system has a large numerical aperture with F number of 2.6, which is extremely conducive to receive and to image the weak reflected near-infrared light. The structure of the optical system of HMPD is same as that of near-infrared imaging part, which is conducive to simplify the processing and assembly. The results indicate that the performance of imaging system is excellent and the resolution is up to QXGA(2 048×1 536). The see-through HMPD possesses an 18 mm exit pupil and a 25 mm eye relief, with the field curvature less than 0.03 D, the distortion less than 0.32% and the resolution up to QXGA. Compared with the current vein imaging device, the proposed system is characterized by compact structure, comfort wearing and ultrahigh resolution, which is suitable for assistant tools in venipuncture techniques.