Fluorescein Leakage and Optical Coherence Tomography Angiography Features of Microaneurysms in Diabetic Retinopathy

Figure 1

The measurement of flow proportion. MA area and flow area were measured using a Photoshop program. Every MA area in OCT B-scan with flow overlay was dragged using the Photoshop dragging tool and a tablet pen. The histogram of every dragged image was examined and the pixel value of each dragged area was obtained. After that, the selected MA area was cropped out using the Photoshop cropping tool and was pasted to a new image. The flow area in the new MA image was also dragged using the Photoshop dragging tool, and the pixel value of each dragged area was calculated in the histogram panel. Flow proportion was defined as the ratio of flow area divided by MA area. The flow proportion of the MA selected in the figure was 68% (68 pixels/100 pixels).