Effects of Intraframe Distortion on Measures of Cone Mosaic Geometry from Adaptive Optics Scanning Light Ophthalmoscopy

被引:21
作者
Cooper, Robert F. [1 ]
Sulai, Yusufu N. [2 ]
Dubis, Adam M. [3 ,4 ]
Chui, Toco Y. [5 ,6 ]
Rosen, Richard B. [5 ,6 ]
Michaelides, Michel [3 ,4 ]
Dubra, Alfredo [1 ,2 ,7 ,8 ]
Carroll, Joseph [1 ,2 ,7 ,8 ]
机构
[1] Marquette Univ, Biomed Engn, Milwaukee, WI 53233 USA
[2] Med Coll Wisconsin, Ophthalmol, Milwaukee, WI USA
[3] UCL, Inst Ophthalmol, London, England
[4] Moorfields Eye Hosp, London, England
[5] New York Eye & Ear Infirm Mt Sinai, New York, NY USA
[6] Icahn Sch Med Mt Sinai, Dept Ophthalmol, New York, NY USA
[7] Med Coll Wisconsin, Cell Biol Neurobiol & Anat, Milwaukee, WI 53226 USA
[8] Med Coll Wisconsin, Biophys, Milwaukee, WI 53226 USA
基金
美国国家卫生研究院; 英国惠康基金;
关键词
adaptive optics; image processing; image analysis; photo-receptors; COHERENCE TOMOGRAPHY; LASER OPHTHALMOSCOPY; DENSITY-MEASUREMENTS; HIGH-SPEED; PHOTORECEPTORS; VARIABILITY; EYE; REPEATABILITY; REFLECTANCE; RELIABILITY;
D O I
10.1167/tvst.5.1.10
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: To characterize the effects of intraframe distortion due to involuntary eye motion on measures of cone mosaic geometry derived from adaptive optics scanning light ophthalmoscope (AOSLO) images. Methods: We acquired AOSLO image sequences from 20 subjects at 1.0, 2.0, and 5.0 degrees temporal from fixation. An expert grader manually selected 10 minimally distorted reference frames from each 150-frame sequence for subsequent registration. Cone mosaic geometry was measured in all registered images (n = 600) using multiple metrics, and the repeatability of these metrics was used to assess the impact of the distortions from each reference frame. In nine additional subjects, we compared AOSLO-derived measurements to those from adaptive optics (AO)-fundus images, which do not contain system-imposed intraframe distortions. Results: We observed substantial variation across subjects in the repeatability of density (1.2%-8.7%), inter-cell distance (0.8%-4.6%), percentage of six-sided Voronoi cells (0.8%-10.6%), and Voronoi cell area regularity (VCAR) (1.2%-13.2%). The average of all metrics extracted from AOSLO images (with the exception of VCAR) was not significantly different than those derived from AO-fundus images, though there was variability between individual images. Conclusions: Our data demonstrate that the intraframe distortion found in AOSLO images can affect the accuracy and repeatability of cone mosaic metrics. It may be possible to use multiple images from the same retinal area to approximate a "distortionless" image, though more work is needed to evaluate the feasibility of this approach. Translational Relevance: Even in subjects with good fixation, images from AOSLOs contain intraframe distortions due to eye motion during scanning. The existence of these artifacts emphasizes the need for caution when interpreting results derived from scanning instruments.
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页数:14
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