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Table 2 Baseline (BL) calibration dataset summary for the Hologic Selenia (H 1 and H 2 ) units

From: A comparison of calibration data from full field digital mammography units for breast density measurements

Target/filter and kV combination

Height range (cm)

Adipose BTE

Glandular BTE

μa(SE)

LIa

R2

μg(SE)

LIg

R2

H 1 unit

       

W/Rh

       

kV =

26

2 - 6

0.464 (0.008)

4.03

0.99

0.624 (0.022)

3.80

0.99

 

27

2 - 6

0.461 (0.007)

4.17

0.99

0.620 (0.020)

3.93

0.99

 

28

2 - 7

0.448 (0.008)

4.26

0.99

0.595 (0.020)

4.00

0.99

 

29

3 - 7

0.432 (0.009)

4.31

0.99

0.560 (0.018)

3.94

0.99

 

30

3 - 7

0.432 (0.007)

4.44

0.99

0.560 (0.016)

4.08

0.99

W/Ag

     

kV =

27

3 - 7

0.412 (0.006)

4.40

0.99

0.539 (0.013)

4.09

0.99

 

28

3 - 7

0.405 (0.006)

4.55

0.99

0.539 (0.013)

4.29

0.99

 

29

3 - 7

0.403 (0.006)

4.71

0.99

0.538 (0.010)

4.45

0.99

 

30

3 - 7

0.400 (0.005)

4.83

0.99

0.537 (0.010)

4.61

0.99

 

31a

3 - 7

0.406 (0.006)

5.04

0.99

0.533 (0.011)

4.76

0.99

 

32b

4 - 7

0.392 (0.004)

5.08

0.99

0.512 (0.011)

4.79

0.99

H 2 unit

       

W/Rh

     

kV =

26

2 - 6

0.464 (0.008)

4.06

0.99

0.616 (0.026)

3.82

0.99

 

27

2 - 6

0.462 (0.008)

4.21

0.99

0.621 (0.019)

3.97

0.99

 

28

2 - 7

0.442 (0.008)

4.27

0.99

0.581 (0.023)

4.00

0.99

 

29

3 - 7

0.431 (0.006)

4.35

0.99

0.536 (0.026)

3.90

0.99

 

30

3 - 7

0.422 (0.007)

4.42

0.99

0.540 (0.020)

4.06

0.99

W/Ag

      

kV =

27

3 - 7

0.404 (0.005)

4.34

0.99

0.518 (0.019)

4.01

0.99

 

28

3 - 7

0.401 (0.004)

4.49

0.99

0.522 (0.015)

4.23

0.99

 

29

3 - 7

0.402 (0.004)

4.66

0.99

0.520 (0.014)

4.37

0.99

 

30

3 - 7

0.395 (0.006)

4.77

0.99

0.534 (0.009)

4.58

0.99

 

31

3 - 7

0.395 (0.005)

4.91

0.99

0.524 (0.009)

4.67

0.99

 

32b

4 - 7

0.388 (0.005)

5.01

0.99

0.506 (0.011)

4.72

0.99

  1. H1: W/Rh data acquired on 07/06/2012; W/Ag 27-30 kV data acquired on 07/06/2012.
  2. H2: W/Rh data acquired on 07/10/2012; W/Ag 27-31 kV data acquired on 07/10/2012.
  3. a: data acquired on 07/09/2012.
  4. b: data acquired on 07/17/2012.
  5. The effective x-ray attenuation coefficients, μa and μg, logarithmic intercepts, LIa and LIg, and coefficient of determination (R2) were derived with regression analysis for the similar Hologic (H1 and H2 ) units for the W/Rh and W/Ag target/filter combinations are provided as mean values. The mean μl and the associated mean standard error (SEl) are cited. The x-ray tube voltage (kV) and phantom height ranges are provided. For each kV setting, the images were acquired by incrementing the phantom heights from the lower range to the upper range in 1 cm increments. The absolute value of the slope is equivalent to the effective x-ray attenuation coefficient for each acquisition technique and BTE material.