Figure 4.

(A-B) Bar graph of SFs calculated across 14 subjects for low- and high-FA Dixon images. Low-FA SFs ranged from 1.2 to 1.9 and high-FA SFs ranged from 1.6 to 4.9. The solid and dashed lines indicate the median ± median absolute deviation. (C-D) Plot showing the range of estimated BD for an example subject calculated with SFs from 1.0 to 6.0, for low- and high-FA data. SFs that were generated for this subject are shown in red. Dashed lines indicate the potential uncertainty for a ~± 10% error on the SF, resulting in a ~± 2% uncertainly in estimated BD. BD,breast density; FA,flip angle; SF, scaling factor.