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Table 3 The list of covariates used to derive eq. 1, 2, 3, 4, 5, 6, 7 and 8. Active pixels refer to the white pixels in binary images

From: Leveraging hybrid biomarkers in clinical endpoint prediction

Covariates Definition
PA The number of active pixels in A
PB The number of active pixels in B
P (B∩A) The number of active pixels that are true for both A and B
n The number of effected slices
(x,y) The contour vertices: -
- Air pocket contour vertices (xi,yi)
- Solid wall contour vertices (xk,yk)
Span The longest distance between two vertices of the tumor mask
ID Inner diameter of a lucent area. If more than one area is present, the average is calculated.