Effective x-ray attenuation coefficient measurements from two full field digital mammography systems for data calibration applications

Table 4 Effective attenuation coefficient comparisons. This shows the numerically derived attenuation coefficients, μ_T, the associated regression variation, Δ, and R² values for the Mo/Mo, Mo/Rh, and Rh/Rh configurations for the same voltage settings (kVp) used for the phantom imaging. Attenuation coefficient confidence intervals are cited beneath the respective values. The <μ > column gives the averaged FL + KS measured attenuation coefficients for the respective tissue types. Percent differences between < μ > and μ _T are listed parenthetically next to the respective μ _T values. Other formatting is the same used above.

Mo/Mo	μ _T	Δ	R²	<μ >
Fat₂₆	0.595 (2.8)	0.010	0.999	0.578
	0.575–0.613
Gland₂₆	0.871 (4.1)	0.020	0.998	0.835
	0.818–0.923
Fat₂₇	0.585 (2.9)	0.010	0.999	0.565
	0.562–0.604
Gland₂₇	0.836 (3.4)	0.021	0.997	0.807
	0.777–0.894
Mo/Rh
Fat₂₈	0.529 (4.0)	0.010	0.999	0.508
	0.511–0.547
Gland₂₈	0.764 (6.8)	0.014	0.998	0.713
	0.772–0.807
Fat₂₉	0.516 (3.8)	0.010	0.999	0.498
	0.498–0.535
Gland₂₉	0.735 (5.3)	0.020	0.998	0.696
	0.690–0.779
Rh/Rh
Fat₃₀	0.462 (4.3)	0.010	0.999	0.442
	0.448–0.476
Gland₃₀	0.675 (5.7)	0.010	0.999	0.636
	0.647–0.703

ISSN: 1475-925X