Aberration determination in OCT imaging using phase gradient autofocus technique
A numerical method for determination and correction of optical aberrations is presented. Based on optical coherence tomography (OCT) data, the wave aberration function is determined using a maximum likelihood estimator. The principles of phase gradient autofocus technique are used to obtain a sample collection to calculate the aberration estimate. The effectiveness of the proposed method has been demonstrated on the eye model and using the real human eye fundus data. The determination of 6λ aberrations and aberrations with high spatial frequencies has been demonstrated. The results were compared with results of aberration compensation method, based on image quality metric optimization.
Institute of Applied Physics of the Russian Academy of Sciences
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