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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.