Non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging

An adaptive optics, scanning imaging technology, applied in optics, optical components, image enhancement and other directions, can solve the problems of high control complexity, high technical cost, slow imaging speed, etc. Difference correction, low cost effect

Pending Publication Date: 2020-11-17
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the MCAO technology system has a large structure, high technical cost, cross-connected aberrations in adjacent halo areas, multiple sets of aberration correction closed-loop control compl

Method used

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  • Non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging
  • Non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging
  • Non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging

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Example Embodiment

[0045] Example 1

[0046] Such as figure 1 As shown, a non-isoplanar aberration correction method for adaptive optics line beam scanning imaging includes: in an adaptive optics line-beam scanning imaging system, performing non-isoplanar aberration in the scanning direction of the line beam Time-sharing correction and regional correction of non-isoplanar aberrations in the direction of the line beam are as follows:

[0047] 1. Time-sharing correction of non-isoplanar aberration in the scanning direction of the line beam:

[0048] Step S1: According to the scanning time, the imaging area of ​​the non-iso-halo zone is divided into multiple sub-imaging areas in the scanning direction, including sub-imaging area 1, sub-imaging area 2,..., sub-imaging area N. The sub-imaging area is in the scanning The size of the field of view in the direction does not exceed 2°; the multiple sub-imaging areas can be evenly divided or non-uniformly divided; N is a positive integer, all satisfying the pr...

Example Embodiment

[0065] Example 2

[0066] Provided is a non-isoplanar aberration correction device for adaptive optics line beam scanning imaging, which adopts the method of embodiment 1 to perform non-isoplanar aberration correction. In a more specific embodiment, the device includes an adaptive optical line beam scanning imaging device, a wavefront sensor, a wavefront controller, a wavefront corrector, and a computer;

[0067] The wavefront controller extracts the wavefront aberration measured by the wavefront sensor and feeds it back to control the wavefront corrector. The computer controls the wavefront controller in accordance with the method of embodiment 1 to complete the closed-loop correction and realization of non-isotropic zone aberration. Non-isoplanar aberration correction in online or offline mode.

[0068] Reference figure 2 In a preferred embodiment, the adaptive optics line beam scanning imaging device includes an imaging light source, a collection system, a first beam splitter, a...

Example Embodiment

[0073] Example 3 Comparison of the conventional correction method and the method of the present invention

[0074] Reference image 3 , Is the result of conventional single-shot adaptive optics aberration correction. Among them, the imaging field of view is 2 degrees (scanning direction) * 4 degrees (line beam direction). After a single aberration correction is performed on the entire imaging field of view, only the center 2*2 degrees belongs to the isotropic zone. This field of view aberration It is completely corrected, the field of view aberration on both sides is not completely corrected, and it is relatively fuzzy; the corresponding two sub-region wavefront aberration data (measured by Hartmann wavefront sensor) can also be seen, the aberration residual exceeds the requirement of the diffraction limit (λ / 14, λ=795nm).

[0075] Reference Figure 4 , Is the result obtained by the method of the present invention. Among them, the image deconvolution processing of the two sub-r...

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Abstract

The invention discloses a non-isoplanatic aberration correction method and device for adaptive optical line beam scanning imaging, and the method comprises the steps: carrying out the time-sharing correction of the aberration of a non-isoplanatic region in a line beam scanning direction in an adaptive optical line beam scanning imaging system, and carrying out the regional correction of the aberration of the non-isoplanatic region in the line beam direction. According to the invention, the limitation of the isoplanatic region on the adaptive optical imaging field of view can be broken through,and aberration correction and high-resolution imaging of the wide field of view of the retina are achieved. According to the wide-field-of-view non-isoplanatic aberration time-sharing and region-dividing correction method and device, wide-field-of-view aberration correction can be completed only through a single wavefront sensor and a single wavefront corrector, and almost no system complexity isincreased. The deconvolution image correction method provided by the invention is low in cost, can compensate adaptive optical aberration correction to the maximum extent through regional deconvolution of wavefront aberration information, is good in correction effect, can perform online processing and post-processing, and is flexible and convenient.

Description

technical field [0001] The invention relates to the field of adaptive optics high-resolution imaging, in particular to a method and device for correcting anisotropic aberration of adaptive optics line beam scanning imaging. Background technique [0002] In order to observe the fundus retina more clearly, adaptive optics technology has been introduced into the field of retinal optical imaging. Using adaptive optics to measure and correct the aberrations of the eye optical system can achieve high-resolution imaging of the fundus retina, and can clearly distinguish micron Grade capillaries, visual cells and other tissues. [0003] However, the aberration measurement and correction of adaptive optics technology can only be effective in an angular range near the center of the field of view, which is defined as the "iso-halo zone" where the adaptive optics correction range is limited. Aberrations can be fully corrected by adaptive optics, and non-isovigorated aberrations beyond t...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T3/40G06T7/11G02B26/10
CPCG06T5/006G06T3/4038G06T7/11G02B26/10G02B26/105A61B3/12G02B21/0012G02B21/0072A61B3/1015A61B3/0025G06T5/003G06T2207/10056G02B27/0031
Inventor 何益陈一巍陈浩高峰邢利娜孔文史国华
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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