3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics

Omer P. Kocaoglu, Sangyeol Lee, Ravi Jonnal, Qiang Wang, Ashley E. Herde, Jason Besecker, Weihua Gao, Donald T. Miller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Optical coherence tomography with adaptive optics (AO-OCT) is a highly sensitive, noninvasive method for 3D imaging of the microscopic retina. The purpose of this study is to advance AO-OCT technology by enabling repeated imaging of cone photoreceptors over extended periods of time (days). This sort of longitudinal imaging permits monitoring of 3D cone dynamics in both normal and diseased eyes, in particular the physiological processes of disc renewal and phagocytosis, which are disrupted by retinal diseases such as age related macular degeneration and retinitis pigmentosa. For this study, the existing AO-OCT system at Indiana underwent several major hardware and software improvements to optimize system performance for 4D cone imaging. First, ultrahigh speed imaging was realized using a Basler Sprint camera. Second, a light source with adjustable spectrum was realized by integration of an Integral laser (Femto Lasers, λc=800nm, Δλ=160nm) and spectral filters in the source arm. For cone imaging, we used a bandpass filter with λc=809nm and Δλ=81nm (2.6 μm nominal axial resolution in tissue, and 167 KHz A-line rate using 1,408 px), which reduced the impact of eye motion compared to previous AO-OCT implementations. Third, eye motion artifacts were further reduced by custom ImageJ plugins that registered (axially and laterally) the volume videos. In two subjects, cone photoreceptors were imaged and tracked over a ten day period and their reflectance and outer segment (OS) lengths measured. High-speed imaging and image registration/dewarping were found to reduce eye motion to a fraction of a cone width (1 μm root mean square). The pattern of reflections in the cones was found to change dramatically and occurred on a spatial scale well below the resolution of clinical instruments. Normalized reflectance of connecting cilia (CC) and OS posterior tip (PT) of an exemplary cone was 54±4, 47±4, 48±6, 50±5, 56±1% and 46±4, 53±4, 52±6, 50±5, 44±1% for days #1,3,6,8,10 respectively. OS length of the same cone was 28.9, 26.4, 26.4, 30.6, and 28.1 ìm for days #1,3,6,8,10 respectively. It is plausible these changes are an optical correlate of the natural process of OS renewal and shedding.

Original languageEnglish (US)
Title of host publicationOphthalmic Technologies XXI
Volume7885
DOIs
StatePublished - Apr 1 2011
Externally publishedYes
EventOphthalmic Technologies XXI - San Francisco, CA, United States
Duration: Jan 22 2011Jan 24 2011

Other

OtherOphthalmic Technologies XXI
CountryUnited States
CitySan Francisco, CA
Period1/22/111/24/11

Fingerprint

Retinal Cone Photoreceptor Cells
photoreceptors
Adaptive optics
Optical tomography
Optical Coherence Tomography
adaptive optics
Cones
cones
tomography
Imaging techniques
Lasers
Physiological Phenomena
Retinal Diseases
Retinitis Pigmentosa
Eye Diseases
Cilia
Macular Degeneration
Phagocytosis
Artifacts
Retina

Keywords

  • Adaptive Optics
  • Cone photoreceptors
  • Optical Coherence Tomography

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Kocaoglu, O. P., Lee, S., Jonnal, R., Wang, Q., Herde, A. E., Besecker, J., ... Miller, D. T. (2011). 3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics. In Ophthalmic Technologies XXI (Vol. 7885). [78850C] https://doi.org/10.1117/12.878229

3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics. / Kocaoglu, Omer P.; Lee, Sangyeol; Jonnal, Ravi; Wang, Qiang; Herde, Ashley E.; Besecker, Jason; Gao, Weihua; Miller, Donald T.

Ophthalmic Technologies XXI. Vol. 7885 2011. 78850C.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kocaoglu, OP, Lee, S, Jonnal, R, Wang, Q, Herde, AE, Besecker, J, Gao, W & Miller, DT 2011, 3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics. in Ophthalmic Technologies XXI. vol. 7885, 78850C, Ophthalmic Technologies XXI, San Francisco, CA, United States, 1/22/11. https://doi.org/10.1117/12.878229
Kocaoglu OP, Lee S, Jonnal R, Wang Q, Herde AE, Besecker J et al. 3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics. In Ophthalmic Technologies XXI. Vol. 7885. 2011. 78850C https://doi.org/10.1117/12.878229
Kocaoglu, Omer P. ; Lee, Sangyeol ; Jonnal, Ravi ; Wang, Qiang ; Herde, Ashley E. ; Besecker, Jason ; Gao, Weihua ; Miller, Donald T. / 3D imaging of cone photoreceptors over extended time periods using optical coherence tomography with adaptive optics. Ophthalmic Technologies XXI. Vol. 7885 2011.
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