Table 1.
Agreement between software volumetric breast density (VBD) in digital mammography (DM) and breast tomosynthesis (BT); four categories (a = lowest density category, d = highest density category)
| Software density BT | ||||||
|---|---|---|---|---|---|---|
| a | b | c | d | Total* | ||
| Software density DM |
a | 927 (50.6%) | 819 (44.7%) | 85 (4.6%) | 1 (0.1%) | 1832 |
| b | 712 (21.0%) | 2245 (66.3%) | 417 (12.3%) | 11 (0.3%) | 3385 | |
| c | 44 (1.4%) | 931 (30.2%) | 1864 (60.5%) | 241 (7.8%) | 3080 | |
| d | 1 (0.1%) | 20 (1.2%) | 555 (34.4%) | 1036 (64.3%) | 1612 | |
| Total | 1684 (17.0%) | 4015 (40.5%) | 2921 (29.5%) | 1289 (13.0%) | 9909 | |
*Observed agreement 61.3%; κ = 0.61