Table 7 Distribution of Mammary Gland Structure and Density Types
From: Monofrequency electrical impedance mammography (EIM) diagnostic system in breast cancer screening
EIM CLASSIFICATION – Electric Conductivity | n (%) | ACR | |
|---|---|---|---|
Type Ia | Amorphous IC, > 0.66 | 64 (5.33) | Predominantly fat, parenchyma below 25% |
Type Ib | Mixed with the predominance of the amorphous component, 0.57–0.65 | 219 (18.25) | |
Type II | Mixed, 0.30–0.56 | 775 (64.58) | Fat with some fibroglandular tissue, parenchyma between 25 and 50% |
Type III | Mixed with the predominance of the ductal component, high density of the ductal component,0.22–0.29 | 98 (8.16) | Heterogeneously dense,parenchyma 50–75% |
Type IV | Ductal, extremely high density of the ductal component, < 0.22 | 44 (3.66) | Extremely dense, parenchyma 75–100% |