Ultrawide-Angle Confocal Laser Line Scanning Fundus Imaging

Xingyu Liu; Yun Xiao; Lin Ji; Yulong Liu; Tongda Wei; Yunhai Zhang

doi:10.3788/CJL230943

Chinese Journal of Lasers, Volume. 50, Issue 21, 2107108(2023)

Ultrawide-Angle Confocal Laser Line Scanning Fundus Imaging

Xingyu Liu^1,2, Yun Xiao^2,5, Lin Ji^1,2, Yulong Liu³, Tongda Wei^2,4, and Yunhai Zhang^1,2、*

¹Division of Life Sciences and Medicine, School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei 230026, Anhui, China

²Jiangsu Key Laboratory of Medical Optics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China

³The Second Affiliated Hospital, Soochow University, Suzhou 215004, Jiangsu, China

⁴Jinan Guoke Medical Technology Development Co., Ltd., Jinan 250102, Shandong, China

⁵Shenyang Guoke Medical Technology Development Co., Ltd., Shenyang 110167, Liaoning, China

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Figures & Tables(13)

Fig. 1. Optical diagram of system

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Fig. 2. Calculation diagram of field of view

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Fig. 3. Calculation diagram of aperture

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Fig. 4. Computation diagrams. (a) Top view; (b) side view

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Fig. 5. Zemax design drawing of detection optical path

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Fig. 6. Image quality evaluation charts of detection optical path. (a) Modulation transfer function images; (b) spot diagram

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Fig. 7. Experimental system

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Fig. 8. Measurement of field of view. (a) Measurement principle; (b) location marking of convergence point; (c) measurement process demonstration

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Fig. 9. Measurement of resolution. (a) Imaging of resolution board; (b) strength curve of fourth pair of wires in group 7

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Fig. 10. Simulation imaging experiment results. (a) Ultra-wide angle imaging image; (b) normal fundus camera imaging image; (c) high resolution imaging image; (d)‒(f) light intensity curves corresponding to imaging regions

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Table 1. Designed parameters of each lens

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Table 1. Designed parameters of each lens

Lens	Field of view （ultra-wide angle/high resolution）	Focal length /mm	Clear aperture （ultra-wide angle/high resolution）
Scanning lens（L₃）	14.6°/14.2°	70 mm	21.8 mm/21.4 mm
Illuminated lens（L₄）	14.6°/14.2°	50 mm	16.7 mm/16.5 mm
Imaging objective lens（L₅）	14.6°/14.2°	50 mm	16.7 mm/16.5 mm
Imaging objective lens（L₆）	14.6°/14.2°	50 mm	16.7 mm/16.5 mm

Table 2. Main indicators of TS8203 scanning galvanometer
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Table 2. Main indicators of TS8203 scanning galvanometer
Parameter Value
Mechanical rotation angle ±12°
Small angle response time 200 ms
Linearity 99%
Short range repeatable accuracy 15 mrad
Mirror diameter 7 mm

Table 3. Actual field of view of system under ultra-wide angle imaging mode
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Table 3. Actual field of view of system under ultra-wide angle imaging mode
No. H /mm L /mm $θ_{v}$ /（°） $θ_{e}$ /（°）
1 26 55 93.2 136.7
2 65 137 93.0 136.4
3 100 208 92.5 135.7

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Xingyu Liu, Yun Xiao, Lin Ji, Yulong Liu, Tongda Wei, Yunhai Zhang. Ultrawide-Angle Confocal Laser Line Scanning Fundus Imaging[J]. Chinese Journal of Lasers, 2023, 50(21): 2107108

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