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OCT Angiography Artifacts


Artifacts are very common in OCT angiography and their identification is important for appropriate image interpretation ( ).

Blockage Artifacts ( Fig. 5.2.1 )

  • Blockage artifacts are caused by lesions that affect light penetration through ocular tissues, including both the anterior and posterior segments.

  • Anterior segment blockage can be cause by cataract, inflammation, or corneal scar.

  • Posterior segment blockage can be caused by intravitreal hemorrhage or inflammation, floaters, intraretinal or subretinal hemorrhage, pigment epithelial detachment (PED), or large drusen.

Fig. 5.2.1, Blockage artifact causing a focal loss of signal.

White Line Artifacts ( Fig. 5.2.2 )

  • Caused by transverse ocular movements.

  • A major cause of artifacts in OCT angiography.

Fig. 5.2.2, White line artifact.

False Positive Flow

  • Ocular movements are in the axial direction (arterial pulsation).

  • An OCT dataset may be displaced and may have enough decorrelation to cause the appearance of flow ( ).

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