ADVANCED PHASE ANALYSIS OF RETINAL VIDEOS USING ECG

ADVANCED PHASE ANALYSIS OF RETINAL VIDEOS USING ECG

Stať ve sborníku mimo WoS a Scopus

Spectral analysis is one way to further explore retinal hemodynamics and vascular pulsation. Specifically, for the phase component of the spectrum of retinal videos, the importance in retinal analysis is not yet fully defined. In this work we review original research for advanced spectral phase analysis of retinal videos from healthy subjects. And the aim of the study is to find out whether the phase value has significance in the classification of blood vessels (arteries and veins). Using the electrocardiographic signals that were simultaneously recorded, we perform normalization according to each cardiac cycle. We measured the left eye of 13 healthy subjects and investigated whether spectral phase analysis is relevant within the cardiac cycle based on photoplethysmography. We found that the temporal difference between the maximum pulsation of arteries and veins in the optic nerve head tissue is on average 9% of the actual cardiac period. For our data set, this corresponds to an average time delay of 80.22 ms. Thus, we conclude that this phase delay between pulsations of arteries and veins can aid in the classification of vessels in the optic nerve head.

Spectral analysis is one way to further explore retinal hemodynamics and vascular pulsation. Specifically, for the phase component of the spectrum of retinal videos, the importance in retinal analysis is not yet fully defined. In this work we review original research for advanced spectral phase analysis of retinal videos from healthy subjects. And the aim of the study is to find out whether the phase value has significance in the classification of blood vessels (arteries and veins). Using the electrocardiographic signals that were simultaneously recorded, we perform normalization according to each cardiac cycle. We measured the left eye of 13 healthy subjects and investigated whether spectral phase analysis is relevant within the cardiac cycle based on photoplethysmography. We found that the temporal difference between the maximum pulsation of arteries and veins in the optic nerve head tissue is on average 9% of the actual cardiac period. For our data set, this corresponds to an average time delay of 80.22 ms. Thus, we conclude that this phase delay between pulsations of arteries and veins can aid in the classification of vessels in the optic nerve head.

Retinal video, spectral phase analysis, photoplethysmography, electrocardiography

Retinal video, spectral phase analysis, photoplethysmography, electrocardiography

ŠÍMA, J.; NĚMCOVÁ, A.; KOLÁŘ, R.

2025

07.06.2024

Kladno

4