Table 2. Measured dimensions in the co-registered OCT images of the phantom target [45] compared against nominal dimensions taken from the phantom’s design file [40]. RMSE: root mean squared error.

Measurement	Image plane	Nominal dimension ( $mm$ )	Mean ( $mm$ )	Standard deviation ( $\mu m$ )	RMSE ( $\mu m$ )
Diameter	Axial (Figure 8(b))	8	7.988	31	33
Staircase step	Coronal (Figure 8(c))	1	1.019	12	22
Staircase step	Sagittal (Figure 8(d))	1	1.002	12	11