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Quantitative analysis and improvemen...

University of Illinois at Chicago.

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Quantitative analysis and improvement of retinal image quality.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Quantitative analysis and improvement of retinal image quality./
作者:	Yang, Yirong.
面頁冊數:	59 p.
附註:	Adviser: Mahnaz Shahidi.
Contained By:	Dissertation Abstracts International68-12B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3294363
ISBN:	9780549394785

Quantitative analysis and improvement of retinal image quality.
Yang, Yirong.

Quantitative analysis and improvement of retinal image quality. - 59 p.

Adviser: Mahnaz Shahidi.

Thesis (Ph.D.)--University of Illinois at Chicago, 2007.

Retinal image formation through the optics of the human eye is the first step in the complex process of vision. Imperfections in the optics of the human eye, including aberrations and scatter, degrade retinal image quality. Determination of the contribution of ocular aberrations and light scatter to decreased retinal image quality, particularly in aging and diseased eyes, is essential to evaluate optical quality of the eye. Correction of ocular aberrations can enable acquiring retinal images with high spatial resolution.

ISBN: 9780549394785Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Quantitative analysis and improvement of retinal image quality.
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245 1 0 $a Quantitative analysis and improvement of retinal image quality.
300 $a 59 p.
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500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8187.
502 $a Thesis (Ph.D.)--University of Illinois at Chicago, 2007.
520 $a Retinal image formation through the optics of the human eye is the first step in the complex process of vision. Imperfections in the optics of the human eye, including aberrations and scatter, degrade retinal image quality. Determination of the contribution of ocular aberrations and light scatter to decreased retinal image quality, particularly in aging and diseased eyes, is essential to evaluate optical quality of the eye. Correction of ocular aberrations can enable acquiring retinal images with high spatial resolution.
520 $a Based on a prototype optical imaging system which coupled optical section retinal imaging and Shack-Hartmann wavefront sensing, a light scatter index was determined by subtracting the area under two line spread function. One line spread function (LSF) was derived from the laser slit image, represented the influence of both ocular aberrations and light scatter. The other LSF was derived from the point spread function (PSF) obtained from the Shack-Hartmann image and represented only ocular aberrations. Measurements were performed in healthy subjects. Higher order ocular aberrations and light scatter were significantly correlated with age.
520 $a Another method for differentiating aberrations and scatter was based on a deconvolution technique. The laser slit image was deconvolved with a PSF obtained from a Shack-Hartmann image. Deconvolution minimized contributions of ocular aberrations to the slit image. The area under the LSF derived from the laser slit image after deconvolution provided a measurement of light scatter. The deconvolution technique was applied to images obtained in control subjects and patients with retinitis pigmentosa (RP). High-order aberrations and light scatter were significantly higher in the patients with RP than in the control subjects.
520 $a A hybrid deconvolution method for improving retinal image quality was developed. The PSF derived from wavefront sensing provided an initial estimation of PSF for blind deconvolution algorithm. Blind deconvolution reestimated the PSF for deconvolving retinal images with Lucy-Richardson method. The depth resolution of optical section retinal images was improved after deconvolution. The contrast and resolution of en face retinal images were improved after deconvolution.
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791 $a Ph.D.
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