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Multi-Angular Electroretinography (maERG): Topographic Mapping of the Retinal Function Combining Real and Virtual
IEEE Transactions on Bio-Medical Engineering
|April 27, 2021
Summary
A new multi-angular electroretinogram (maERG) method creates "virtual electrodes" to map retinal function. This technique, combined with advanced algorithms, allows for precise localization of retinal dysfunction, improving patient monitoring for retinopathies.
Area of Science:
- Ophthalmology
- Neuroscience
- Biomedical Engineering
Background:
- Full-field electroretinogram (ffERG) assesses global retinal function but cannot localize dysfunction.
- Current ffERG limitations hinder precise diagnosis and monitoring of retinal diseases.
Purpose of the Study:
- To develop a novel method, multi-angular ERG (maERG), for localized retinal function assessment.
- To create a functional retinal map using virtual electrodes and advanced computational modeling.
Main Methods:
- Developed maERG by recording multiple spatial derivations using eye rotation and 11 gaze positions, creating 33 virtual electrodes.
- Constructed a realistic eye model (forward model) to reconstruct retinal activity (inverse problem).
- Compared LORETA and Minimum Norm Estimate algorithms for source reconstruction, requiring a 50 dB signal-to-noise ratio.
Main Results:
- LORETA demonstrated superior performance in reconstructing retinal sources compared to Minimum Norm Estimate.
- Accurate functional retinal mapping necessitates a signal-to-noise ratio of at least 50 dB.
- Simulations successfully reconstructed retinal activity in pathological scenarios (scotomas).
Conclusions:
- The maERG method, coupled with electromagnetic inverse problem solutions, enables functional retinal map reconstruction.
- This technique offers a significant advancement in objectively assessing and localizing retinal function.
