July 2020
Volume 61, Issue 9
Free
ARVO Imaging in the Eye Conference Abstract  |   July 2020
A comparison study of corneal motion analysis using optical coherence tomography (OCT) devices with two different acquisition speeds
Author Affiliations & Notes
  • Lukas Rothmann
    Carl Zeiss Meditec, Inc., Dublin, California, United States
    Karlsruhe Institute of Technology, Karlsruhe, Baden-Wuerttemberg, Germany
  • Homayoun Bagherinia
    Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Mary Durbin
    Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Footnotes
    Commercial Relationships   Lukas Rothmann, Carl Zeiss Meditec, Inc. (C); Homayoun Bagherinia, Carl Zeiss Meditec, Inc. (E); Mary Durbin, Carl Zeiss Meditec, Inc. (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2020, Vol.61, PB0087. doi:
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    • Get Citation

      Lukas Rothmann, Homayoun Bagherinia, Mary Durbin; A comparison study of corneal motion analysis using optical coherence tomography (OCT) devices with two different acquisition speeds. Invest. Ophthalmol. Vis. Sci. 2020;61(9):PB0087.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : The increased acquisition rate of the latest OCT devices compared to previous generations is expected to reduce the eye motion during a pachymetry scan due to the decreased scan duration. The corneal motion correction algorithm can be consulted to compare the overall eye movement for the two different systems.

Methods : 10 healthy eyes from 10 subjects were imaged using the CIRRUS™ HD-OCT 5000 (Zeiss, Dublin, CA) pachymetry scan, and a separate 10 subjects were imaged using the same scan pattern on the CIRRUS™ 6000 (Zeiss, Dublin, CA). Cirrus 6000 operates at an A-scan acquisition rate of 100 kHz whereas Cirrus 5000 has an A-scan acquisition rate of 27 kHz. The corneal motion correction algorithm (IITE 2017 – Bagherinia et al., “A self-correcting method to reduce motion artifacts in OCT corneal scans”) was applied to each scan. The algorithm outputs the x, y and z motions of each radial B-scan of a pachymetry scan pattern (24 radial B-scans over 9 mm diameter with 1024 samples; 24 x, y and z shift parameters). These parameters are obtained by minimizing error between the anterior corneal surface of OCT data and the two dimensional parametric model (e.g. quadric surface) of the corneal surface at each iteration. The almost circular projection of corneal surface contour lines on the xy-plane (see Figure 1, right) show that the motion artifacts from the unprocessed image (see Figure 1, left) were reduced by the algorithm. The standard deviation (SD) of the x, y and z shift parameters is used to determine the overall eye motion in each scan.

Results : The comparison of the SD values for x, y and z shifts between the two systems show that the higher acquisition speed of Cirrus 6000 results in a significant reduction of motion/shift (see Table 1) while scanning (38% x-direction, 49% y-direction, 42% z-direction). Overall, the motion artifacts of faster scan acquisition are less than for slower scan acquisition.

Conclusions : Due to a faster scan rate the eye movement during an image acquisition is naturally less. This ultimately enhances the scan quality by reducing the impact of motion artifacts.

This is a 2020 Imaging in the Eye Conference abstract.

 

Figure 1: Contour lines plots before (left) and after (right) motion correction algorithm.

Figure 1: Contour lines plots before (left) and after (right) motion correction algorithm.

 

Table 1: x, y and z-shift comparison between Cirrus 5000 and 6000 pachymetry scans.

Table 1: x, y and z-shift comparison between Cirrus 5000 and 6000 pachymetry scans.

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