Pupil vignetting artifact on optical coherence tomography angiography
Sampurna Bhattacharyya1, Zubin D'souza1, Raghulnadhan Ramanadhane1
1Department of Vitreo Retina, Aditya Birla Sankara Nethralaya, Mukundapur, Kolkata, West Bengal, India.
Indian Journal of Ophthalmology
|December 22, 2023
Summary
A novel pupil vignetting artifact on optical coherence tomography angiography (OCTA) can mimic retinal diseases. Recognizing this artifact is crucial to prevent misdiagnosis in clinical practice.
Area of Science:
- Ophthalmology
- Medical Imaging
- Retinal Diagnostics
Background:
- Optical coherence tomography angiography (OCTA) is a key imaging modality in ophthalmology.
- Artifacts in OCTA can lead to misinterpretation of retinal pathology.
- Accurate interpretation of OCTA requires understanding potential imaging artifacts.
Purpose of the Study:
- To describe the characteristics of a newly identified artifact on OCTA, termed the pupil vignetting artifact.
- To explain how this artifact can be mistaken for genuine chorioretinal conditions.
- To raise awareness among clinicians regarding this specific OCTA artifact.
Main Methods:
- Retrospective observational case series.
- Analysis of 12 eyes with a distinct dark shadow artifact on OCTA imaging.
- Review of artifact location, size, and shape in relation to retinal anatomy.
Main Results:
- A dark shadow artifact was observed in the macula of 12 eyes.
- The artifact did not correlate with areas of retinal ischemia or media opacity.
- The artifact is attributed to the vignetting effect of the pupil during OCTA scanning, reducing incident light on the retina.
Conclusions:
- The pupil vignetting artifact is an unrecognized phenomenon on OCTA.
- This artifact can mimic various true chorioretinal pathologies.
- Awareness and understanding of this artifact are essential to avoid clinical misdiagnosis.
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