Optical Coherence Tomography angiography (OCTA) is widely used to image chorioretinal vasculature, with contrast that derives from scattering and motion of red blood cells (RBCs). In the rat eye, a scattering tracer highlights vertical vessels which are not visualized by intrinsic RBC scattering alone. The dependence of microvessel OCTA on angular orientation, explored in this work, represents a potential artifact that should be considered in the clinical interpretation of OCTA.

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光学相干断层扫描血管造影（OCTA）被广泛用于脉络膜视网膜血管成像，其对比度源自红细胞（RBC）的散射和运动。在大鼠眼中，散射示踪剂突出显示了垂直血管，而仅通过固有的RBC散射无法观察到。在这项工作中探讨的微血管OCTA对角向的依赖性代表了在OCTA的临床解释中应考虑的潜在假象。