Image artefacts in swept-source optical coherence tomography angiography

Abstract

Image artefacts occur frequently in OCTA images. The artefacts are more frequent in eyes with pathology.

Retinal vessel calibre measurements by optical coherence tomography angiography

“…These include, but are not limited to, projection, segmentation, motion, masking, unmasking and blink artefacts 3 4. Spaide et al 3 speculated that in OCTA, the calibre of vessels may be depicted to be larger than in their real state, but vessels calibres were not specifically quantified in order to validate this hypothesis.…”

Optical Coherence Tomography Angiography Offers New Insights into Choriocapillaris Perfusion

“…This can produce artifacts, but allows for a more robust visualization of vasculature [26]. The exact localization and thickness of the CC slab vary between 0 and 34 µm below the RPE/Bruch's membrane reference and between 4.4 and 30 µm, respectively, depending on the device used [17,20,27,28]. Notably, manufacturers use various definitions of the CC slab level, and not all of them offer a presetting for CC examination yet (Table 1).…”

“…(2) Segmentation errors in OCTA are frequent in the presence of retinal pathologies and can affect all layers, including the CC [20]. Notably, en face imaging requires an accurate segmentation of retinal layers, which can be reliably achieved in normal maculae.…”

Optical coherence tomography angiography of the retina and choroid; current applications and future directions

“…In recent studies, at least one form of artifact was identified in 73–89.4% of OCTA images with more prevalence in eyes with ocular pathology and poor visual acuity 33, 45. The artifacts were severe enough to preclude accurate grading of the images in 17.6% 41 . In addition, correction of artifacts such as segmentation artifact can be challenging.…”