Table 2 Parameters calculated by Shanbhag thresholding.

From: Qualitative and quantitative comparison of two semi-manual retinal vascular density analyzing methods on optical coherence tomography angiography images of healthy individuals

 

ETDRS Sectors

1

2

3

4

5

6

7

8

9

SkD

Mean (SD)

0.012 (0.014)

0.047 (0.03)

0.044 (0.026)

0.05 (0.026)

0.043 (0.027)

0.063 (0.03)

0.087 (0.03)

0.06 (0.026)

0.041 (0.022)

VD

Mean (SD)

0.039 (0.047)

0.214 (0.106)

0.181 (0.09)

0.221 (0.09)

0.175 (0.1)

0.302 (0.109)

0.4 (0.095)

0.289 (0.093)

0.19 (0.078)

VDI

Mean (SD)

2.983 (0.929)

4.704 (0.926)

4.465 (0.945)

4.85 (1.096)

4.422 (0.899)

5.18 (1.064)

4.881 (1.093)

5.163 (1.165)

5.064 (1.031)

  1. ETDRS Early treatment of diabetic retinopathy study, SkD skeleton density, VD vessel density, VDI vessel diameter index, SD standard deviation.
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