Table 8 Percent glandular map absolute % variation. This shows the individual external error (top) and internal error (bottom) components for the Molybdenum/Molybdenum – 26 kVp map output for each mixture. Totals follow from Eq. (8). The last two rows list the field of view average and standard deviation for each composition.

n₁

0.02

0.30

0.89

1.42

1.68

n₂

3.8

3.1

1.8

0.64

0.07

n₃

0.07

1.3

3.7

6.0

7.0

n₄

7.4

6.0

3.5

1.3

0.14

n₅

0.78

0.95

1.42

1.9

2.3

total external variation

8.4

7.0

5.7

6.6

7.6

Internal variation

n₁

0.02

0.03

0.89

1.42

1.68

n₂

3.80

3.10

1.81

0.64

0.08

n₃

0.0

0.10

0.30

0.47

0.56

n₄

0.58

0.47

0.30

0.10

0.01

n₅

0.78

0.95

1.42

1.90

2.3

total internal variation

3.9

3.3

2.5

2.5

2.9

<z>

1.659

1.329

0.735

0.188

-0.738

Δz

0.013

0.016

0.024

0.033

0.040