Retinal Imaging: Adaptive Optics

Goncharov, A. S.; Iroshnikov, N. G.; Larichev, A. V.

doi:10.1007/978-1-4614-5176-1_11

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…One of the main factors limiting the lateral resolution of OCT systems is eye optical aberrations. Adaptive optics made it possible to significantly increase the lateral resolution of OCT systems [1]. Recently, several methods were developed to compensate for aberration effects in postprocessing [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Amplitude Zone Plate in Adaptive Optics: Proposal of the Principle

et al. 2022

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One of the main elements in hardware-based adaptive optics systems is a deformable mirror. There is quite a large number of such mirrors based on different principles and exhibiting varying performance. They constitute a significant portion of the cost of the final optical devices. In this study, we consider the possibility of replacing an adaptive mirror with the adaptive amplitude Fresnel zone plate, implemented using a digital light-processing matrix. Since such matrices are widely used in mass industry products (light projectors), their costs in large batches are 1–2 orders of magnitude lower than the cost of inexpensive deformable mirrors. Numerical modeling for scanning an optical coherence tomography system with adaptive optics is presented. It is shown that wavefront distortions with high spatial frequencies and large amplitudes can be corrected using an amplitude Fresnel zone plate. The results are compared with piezoelectric and microelectromechanical system mirrors.

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Section: Introductionmentioning

confidence: 99%

Amplitude Zone Plate in Adaptive Optics: Proposal of the Principle

et al. 2022

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“…One of the challenges in ophthalmoscopy is high‐resolution imaging of the human retina, which is hindered by wave front distortions (optical aberrations) introduced by the eye into the optical imaging system. To determine and compensate for the influence of these aberrations, adaptive optics (AO) is being successfully used 1 . This technique requires additional elements in the optical setup: means for projecting a guide‐star onto the retina, a wave front sensor, and a wave front corrector.…”

Section: Introductionmentioning

confidence: 99%

Determination and correction of aberrations in full field optical coherence tomography using phase gradient autofocus by maximizing the likelihood function

Matkivsky

Moiseev

Shilyagin

et al. 2020

Journal of Biophotonics

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A method for numerical estimation and correction of aberrations of the eye in fundus imaging with optical coherence tomography (OCT) is presented. Aberrations are determined statistically by using the estimate based on likelihood function maximization. The method can be considered as an extension of the phase gradient autofocusing algorithm in synthetic aperture radar imaging to 2D optical aberration correction. The efficacy of the proposed method has been demonstrated in OCT fundus imaging with 6λ aberrations. After correction, single photoreceptors were resolved. It is also shown that wave front distortions with high spatial frequencies can be determined and corrected.

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“…system. To determine and compensate for the influence of these aberrations, adaptive optics (AO) is being successfully used [1]. This technique requires additional elements in the optical setup: means for projecting a guide-star onto the retina, a wavefront sensor, and a wavefront corrector.…”

mentioning

confidence: 99%

Determination and correction of aberrations in full field OCT using phase gradient autofocus by maximizing the likelihood function

Matkivsky¹,

Moiseev²,

Shilyagin³

et al. 2020

Preprint

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A method for numerical estimation and correction of aberrations of the eye in fundus imaging with optical coherence tomography (OCT) is presented. Aberrations are determined statistically by using the estimate based on likelihood function maximization. The method can be considered as an extension of the phase gradient autofocusing algorithm in synthetic aperture radar imaging to 2D optical aberrations correction. The efficiency of the proposed method has been demonstrated in OCT fundus imaging with 6λ aberrations. After correction, single photoreceptors were resolved. It is also shown that wavefront distortions with high spatial frequencies can be determined and corrected.

show abstract

Retinal Imaging: Adaptive Optics

Cited by 4 publications

References 38 publications

Amplitude Zone Plate in Adaptive Optics: Proposal of the Principle

Amplitude Zone Plate in Adaptive Optics: Proposal of the Principle

Determination and correction of aberrations in full field optical coherence tomography using phase gradient autofocus by maximizing the likelihood function

Determination and correction of aberrations in full field OCT using phase gradient autofocus by maximizing the likelihood function

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