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Improved illumination system of laparoscopes using an aspherical lens array

机译:使用非球面透镜阵列的改进的腹腔镜照明系统

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摘要

The current fiber-based illumination systems of laparoscopes are unable to uniformly illuminate a large enough area in abdomen due to the limited numerical aperture (NA) of the fiber bundle. Most energy is concentrated in a small region at the center of the illumination area. This limitation becomes problematic in laparoscopes which require capturing a wide field of view. In this paper, we propose an aspherical lens array which is used to direct the outgoing rays from the fiber bundle of laparoscope to produce a more uniformly illuminated, substantially larger field coverage than standalone fiber source. An intensity feedback method is developed to design the aspherical lens unit for extended non-Lambertian sources, which is the key to the design of this lens array. By this method, the lens unit is obtained after only one iteration, and the lens array is constructed by Boolean operation. Then, the ray-tracing technique is used to verify the design. Further, the lens array is fabricated and experimental tests are performed. The results clearly show that the well-illuminated area is increased to about 0.107m2 from 0.02m2 (about 5x larger than a standard fiber illumination source). More details of the internal organs can be clearly observed under this improved illumination condition, which also reflects the significant improvement in the optical performance of the laparoscope.
机译:由于光纤束的有限数值孔径(NA),当前的腹腔镜基于纤维的照明系统不能均匀地照明腹部足够大的区域。大部分能量集中在照明区域中心的一个小区域中。这种限制在需要捕获宽视野的腹腔镜中成为问题。在本文中,我们提出了一种非球面透镜阵列,该阵列用于引导腹腔镜纤维束的出射光线,以产生比独立纤维源更均匀照明的,更大的视野范围。开发了一种强度反馈方法来为扩展的非朗伯光源设计非球面透镜单元,这是该透镜阵列设计的关键。通过这种方法,仅一次迭代就获得了透镜单元,并且通过布尔运算构造了透镜阵列。然后,使用光线跟踪技术来验证设计。此外,制造透镜阵列并进行实验测试。结果清楚地表明,良好照明的区域从0.02m 2 增加到大约0.107m 2 (比标准光纤照明源大大约5倍)。在这种改进的照明条件下,可以清楚地观察到内部器官的更多细节,这也反映了腹腔镜光学性能的显着改善。

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