Ultrafast parallel coherence gating for an adaptive optics retina camera

Junle Qu, Ravi Jonnal, Donald T. Miller

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

We have constructed an en face coherence gated camera for optically sectioning the in vivo human retina. Coherence gating is generated by a free-space Michelson interferometer employing a superluminescent diode for illuminating the retinal tissue; voice coil and piezo-electric translators for controlling the optical path length of the reference channel; and a scientific-grade CCD camera for recording 2-D retinal interferograms. A conventional 1-D OCT is incorporated for tracking the axial motion of the retina and controlling the gating position. En face slices of test objects and retinal tissue were obtained using a four-step (λ/4) phase shift method. Ultrafast acquisition of four interferograms in less than 7 milliseconds has been achieved to mitigate eye motion blur. A 5-step reconstruction algorithm that is more robust to phase shift error and noise was compared to the 4-step. The axial width of the point spread function and the sensitivity of the camera were measured near 10μm and 76 dB, respectively, which is substantially better than current flood-illuminated and confocal scanning laser ophthalmoscopes equipped with adaptive optics.

Original languageEnglish (US)
Pages (from-to)352-359
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4956
DOIs
StatePublished - Dec 5 2003
Externally publishedYes
EventPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII - San Jose, CA, United States
Duration: Jan 27 2003Jan 29 2003

Fingerprint

Interferogram
Retina
Adaptive optics
retina
Adaptive Optics
Phase Shift
adaptive optics
Phase shift
Camera
Cameras
cameras
Tissue
Motion Blur
Michelson Interferometer
Michelson interferometers
Laser Scanning
Confocal
CCD Camera
Optical transfer function
interferometry

Keywords

  • Adaptive optics
  • Coherence gating
  • Confocal scanning laser ophthalmoscope
  • Eye
  • Michelson interferometer
  • Optical coherence tomography
  • Retina
  • Retina imaging

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ultrafast parallel coherence gating for an adaptive optics retina camera. / Qu, Junle; Jonnal, Ravi; Miller, Donald T.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4956, 05.12.2003, p. 352-359.

Research output: Contribution to journalConference article

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