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Table 1 Diagnostic criteria for the differentiation of volumetric lesions in electroimpedance mammography

From: Monofrequency electrical impedance mammography (EIM) diagnostic system in breast cancer screening

Diagnostic criteria

Electrical impedance mammography points (EIM)

Shape

Round, oval

1

Lobular, irregular

2

Contour

No

0

Sharp

1

Hyperimpedance, indistinct

2

Surrounding tissues

Preserved

0

Structure alteration/displacement

1

Thickening/extrusion/retraction

2

Internal electrical structure

Hyperimpedance

0

Isoimpedance

1

Hypoimpedance

2

Animpedance

3

Comparative electrical conductivity

Divergence between the histograms < 20%

0

Divergence between the histograms 20–30%

1

Divergence between the histograms 30–40%

2

Divergence between the histograms > 40%

3