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Table 1 Exposure and pixel value response analysis by target/filter and select kV combination

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

H1and H2

mAs

m1(SE1)

b1

R12

mAs

m2(SE2)

b2

R22

W/Rh

        

kV =

26

26 - 150

63.86 (0.15)

0.65

0.99

26 - 150

66.26 (0.15)

38.69

0.99

 

28

10 - 120

82.37 (0.38)

3.06

0.99

10 - 120

85.24 (0.09)

43.44

0.99

 

30

4 - 85

101.37 (0.66)

16.52

0.99

4 - 85

105.26 (0.17)

48.54

0.99

W/Ag

        

kV =

28

4 - 85

113.52 (0.57)

19.31

0.99

4 - 85

108.44 (0.21)

52.47

0.99

 

30

4 - 75

146.00 (1.04)

2.51

0.99

4 - 75

137.99 (0.51)

54.89

0.99

H 3 and GE

mAs

m 3 (SE 3 )

b 3

R 3 2

mAs

m 0 (SE 0 )

b 0

R 0 2

Mo/Mo

        

kV =

26

6 - 80

103.86 (0.30)

72.34

0.99

10 - 80

183.37 (0.89)

56.65

0.99

 

27

6 - 80

122.71 (0.36)

72.29

0.99

10 - 65

219.59 (1.09)

29.72

0.99

Mo/Rh

        

kV =

28

6 - 65

123.56 (0.60)

76.19

0.99

7 - 56

248.42 (0.78)

12.03

0.99

 

29

6 - 65

142.01 (0.73)

69.55

0.99

10 - 45

288.13 (1.32)

3.09

0.99

  1. H1: data acquired on 07/27/2012.
  2. H2: data acquired on 07/20/2012.
  3. H3: data acquired on 04/08/2013.
  4. GE: data acquired on 10/13/2006.
  5. GE: quantities referenced with the ′0′ subscript.
  6. The detector exposure and pixel value response is modeled as a linear function of mAs for select kV settings: (1) the W/Rh and W/Ag target/filter combinations for the similar Hologic Selenia systems H1 and H2 (top); and (2) the Mo/Mo and Mo/Rh combinations for the third Hologic Selenia H3 system and General Electric Senographe 2000D (GE) system (bottom), designated by the subscript 0. The slopes (mi) and standard error (SEi), estimated as unit increase in pixel value per mAs, intercept (bi) measured in pixel value, and coefficient of determination (Ri2) were derived from linear regression analysis. The mAs columns give the range of settings used for the acquisition techniques. The upper mAs value for a given technique was set close to where detector saturation occurs.