OCT Retinal Layer Mapping for Hemisphere-Specific rTSD Quantification
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Solution Overview
Problem
Current methods are inadequate for accurately predicting or halting disability progression in progressive forms of multiple sclerosis (MS) due to the lack of understanding of retrograde trans-synaptic degeneration (rTSD) mechanisms, which contribute to neurodegeneration and disability, particularly in the visual pathway.
Innovation Solution
A method using optical coherence tomography (OCT) to quantify rTSD by analyzing retinal layer thicknesses and determining an rTSD index, which indicates the level and hemisphere-specific cause of rTSD, utilizing machine learning models and advanced MRI techniques to identify specific lesion types such as paramagnetic rim lesions and central vein signs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If OCT imaging is used to measure retinal layer thickness, then noninvasive assessment of the visual pathway is enabled, but precise localization and quantification of rTSD remains inadequate
Solution Approach 1:
The method segments the retina into distinct layers (ganglion cell layer, inner plexiform layer, inner nuclear layer) and further divides measurements into nasal and temporal quadrants. This segmentation allows precise localization of rTSD to specific retinal regions corresponding to different optic radiation pathways, transforming a general thickness measurement into a localized diagnostic tool that can distinguish between left and right hemisphere lesions.
Solution Approach 2:
The invention applies local quality by measuring retinal layer thickness specifically in nasal and temporal quadrants rather than uniformly across the entire retina. Different quadrants correspond to different optic radiation pathways (nasal retina to contralateral temporal optic radiation, temporal retina to ipsilateral nasal optic radiation), enabling localization of lesions to specific brain hemispheres while maintaining noninvasive assessment.
2Reliability
If conventional MRI is used to assess the visual pathway, then post-geniculate lesions can be detected, but precise quantification of neurodegeneration and localization to specific hemispheres is limited
Solution Approach 1:
The retina serves as an intermediary structure that preserves spatial information about optic radiation pathways. By measuring retinal layer thickness in specific quadrants, the method translates brain lesion information into a readily accessible ocular window, allowing noninvasive assessment of hemisphere-specific pathology without requiring direct brain imaging interpretation.
Solution Approach 2:
The invention adds a new dimension of measurement by utilizing retinal layer thickness as a quantitative biomarker for rTSD. This transforms the assessment from qualitative MRI lesion detection to quantitative retinal imaging that provides both extent and localization information, creating a complementary diagnostic dimension that enhances hemisphere-specificity determination.
3Ease of operation
If retinal layer thickness measurements are taken without quadrant-specific analysis, then overall retinal health can be assessed, but localization of rTSD to specific hemispheres and optic radiation pathways is lost
Solution Approach 1:
The method divides the retina into four quadrants (superior nasal, inferior nasal, superior temporal, inferior temporal) and measures thickness independently in each quadrant. This segmentation preserves spatial information about which optic radiation pathways are affected, enabling localization to specific brain hemispheres while maintaining a systematic and reproducible measurement approach.
Solution Approach 2:
The invention exploits the asymmetric organization of visual pathways where nasal and temporal retinal regions project to contralateral and ipsilateral brain hemispheres respectively. By analyzing asymmetries in thickness measurements between quadrants, the method localizes rTSD to specific hemispheres, transforming a symmetric measurement approach into an asymmetric diagnostic tool.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a precise quantification of rTSD, enabling the identification of MS patients at risk of accelerated neurodegeneration and disability progression, allowing for targeted therapeutic interventions.
Implementation Method 1
receiving optical coherence tomography (OCT) image data associated with a left retina and a right retina of the patient
Implementation Method 2
optical coherence tomography (OCT), a reproducible, noninvasive retinal imaging technique, have enabled precise quantification of retinal layer thickness
Data Source
AI summary
A method for quantifying retrograde trans-synaptic degeneration (rTSD) in a patient includes receiving optical coherence tomography (OCT) image data associated with a left retina and a right retina of the patient. The method further includes analyzing the OCT image data to determine a thickness of one or more retinal layers of the left retina and one or more retinal layers of the right retina. The method further includes, based at least in part on the determined thicknesses, determining a value of an rTSD index that is indicative of a level of rTSD in the patient. The rTSD index can be based at least in part on the thicknesses of retinal layers connected to a left optic radiation of the patient versus the thicknesses of retinal layers connected to a right optic radiation of the patient.