IP Library › Granted Patent US 12,412,245
Granted Patent B2
US 12,412,245 · App. 18/082,448 · Granted Sep 9, 2025

Method and system for axial motion correction

Inventor: Homayoun Bagherinia (Oakland, CA)
Assignee: CARL ZEISS MEDITEC, INC.
G06T5/10A61B3/1005A61B3/102A61B3/12G06T5/50G06T7/20G06T2207/10101G06T2207/30041
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Quick Facts
Patent No.
US 12,412,245
App. No.
18/082,448
Granted
Sep 9, 2025
Kind
B2
Abstract

A method and system for correcting axial motion in optical coherence tomography (OCT) data is provided. The method includes collecting, by a processor disposed of in an OCT device, a volume scan of an eye; segmenting a first retinal layer within the volume scan; applying an algorithm for periodic pattern removal of OCT data in the first retinal layer by determining a model of a Fourier transform applicable to a segment of the first retinal layer; and removing transform frequencies associated with the OCT data using the model of the Fourier transform; determining a measure of an amount of axial motion in accordance with a difference of an amount of OCT data captured on a surface of the first retinal layer before and after application of the algorithm for periodic pattern removal; and correcting, the amount of axial motion in the OCT data of the first retinal layer.

Claims (29)

1. A method for correcting for axial motion in optical coherence tomography (OCT) data, comprising:

collecting, by a processor disposed of in an OCT device, a volume scan of an eye;

segmenting, by the processor, a first retinal layer within the volume scan;

applying, by the processor, an algorithm for periodic pattern removal of OCT data in the first retinal layer by:

determining a model of a Fourier transform applicable to a segment of the first retinal layer; and

removing one or more transform frequencies associated with the OCT data using the model of the Fourier transform for the periodic pattern removal while leaving unchanged other frequencies associated with OCT data in the first retinal layer;

determining, by the processor, a measure of an amount of axial motion in accordance with a difference in an amount of OCT data captured on a surface of the first retinal layer before and after application of the algorithm for periodic pattern removal; and

correcting, by the processor, the amount of axial motion in the OCT data of the first retinal layer.

2. The method of claim 1 , wherein the periodic pattern removal further comprises recovering by the processor of a motion-corrected version of the first retinal layer by applying an inverse Fourier transfer after removal of the frequencies associated with the periodic pattern removal.

3. The method of claim 1 , further comprising:

correcting, by the processor, the amount of axial motion, in a second retinal layer.

4. The method of claim 3 , wherein the first retina layer comprises an internal limiting membrane (ILM) layer, and the second retinal layer comprises retinal pigment epithelium (RPE) layer.

5. The method of claim 1 , further comprising: defining, by the processor, a retinal thickness map in accordance with a difference in the amount of OCT data contained on the surface of the ILM layer and the RPE layer after application of an axial motion correction to the ILM layer and the RPE layer.

6. The method of claim 1 , wherein the model for periodic pattern removal is determined by an integral number of oscillations across the Fourier transform.

7. The method of claim 1 , wherein the first retinal layer at least comprises a two-dimensional retinal layer.

8. A system for correcting axial motion error in optical coherence tomography (OCT) data, comprising:

an OCT device configured to collect a volume scan of an eye; and

a processor disposed of in the OCT device configured to:

apply an algorithm for periodic pattern removal of OCT data in a first retinal layer to:

determine a model of a Fourier transform applicable to a segment of the first retinal layer; and

remove one or more transform frequencies associated with the OCT data using the model of the Fourier transform for the periodic pattern removal while leaving unchanged other frequencies associated with OCT data in the first retinal layer;

determine a measure of an amount of axial motion in accordance with a difference in an amount of OCT data captured on a surface of the first retinal layer before and after application of the algorithm for periodic pattern removal; and

correct the amount of axial motion in the OCT data of the first retinal layer.

9. The system of claim 8 , wherein the processor is configured to: correct the amount of axial motion in a second retinal layer.

10. The system of claim 9 , wherein the first retinal layer is positioned higher than the second retinal layer within a retina of the eye.

11. The system of claim 10 , wherein the first retinal layer comprises an internal limiting membrane (ILM) layer, and the second retinal layer comprises a retinal pigment epithelium (RPE) layer.

12. The system of claim 11 , wherein the processor is configured to define a retinal thickness map in accordance with a difference in the amount of OCT data contained on the surface of the ILM layer and the RPE layer after application of an axial motion correction to the ILM layer and the RPE layer.

13. The system of claim 12 , wherein the model for periodic pattern removal is determined by an integral number of oscillations across the Fourier transform.

14. The system of claim 13 , wherein the first retinal layer at least comprises a two-dimensional retinal layer.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 25, 2023
From: BAGHERINIA, HOMAYOUN
To: CARL ZEISS MEDITEC, INC.
Reel/Frame 062488/0402 →
Continuity (2)
Provisional Application 63291246 · Dec 17, 2021
Related Publication 20230196525A1 · Jun 22, 2023
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