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Table 8 Mechanical wedges: average (± SD) percentage difference of Transmission Factors between GLAaS and Reference (Eclipse or ion chamber) over the 4 wedge insert directions.

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

 

GLAaS vs Eclipse [%]

GLAaS vs IonCh. [%]

Eclipse vs IonCh. [%]

W1 - 15°

-1.3 ± 0.2

-1.1 ± 0.1

0.2 ± 0.1

W2 - 30°

-1.6 ± 0.1

0.2 ± 0.1

1.7 ± 0.1

W3 - 45°

-1.6 ± 0.1

-0.8 ± 0.1

0.8 ± 0.0

W4 - 60°

-1.3 ± 0.2

-0.8 ± 0.2

0.4 ± 0.0