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Table 10 Mechanical wedges: minimum, maximum and average (± SD) percentage difference between GLAaS and Reference (Eclipse or ion chamber) in the flattened region.

From: Testing the portal imager GLAaS algorithm for machine quality assurance

 

GLAaS vs Eclipse Mean ± SD [Range] [%]

GLAaS vs Ion Chamber Mean ± SD [Range] [%]

Rmin = 100*(DminGLAaS-DminRef)/DminGLAaS

-1.3 ± 0.7 [-2.0, -0.2]

-0.8 ± 0.8 [-1.8, +0.3]

Rmax = 100*(DmaxGLAaS-DmaxRef)/DmaxGLAaS

-0.7 ± 0.7 [-1.5, +0.5]

0.7 ± 1.1 [-0.6, +2.8]

Rave = 100*(DaveGLAaS-DaveRef)/DaveGLAaS

-0.2 ± 0.2 [-0.4, +0.2]

0.2 ± 0.3 [-0.1, +0.7]

min(100*(DGLAaS-DRef)/DGLAaS)

0.3 ± 0.2 [0.0, +0.6]

-

max(100*(DGLAaS-DRef)/DGLAaS)

-1.4 ± 0.8 [-2.4, -0.3]

-

ave(100*(DGLAaS-DRef)/DGLAaS)

-0.2 ± 0.2 [-0.5, +0.1]

-