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European Radiology Experimental

Table 2 Median values and interquartile range for tube voltage, exposure, MGD, CNR, and FOM for DM DBT and CEM

From: Phantom-based analysis of variations in automatic exposure control across three mammography systems: implications for radiation dose and image quality in mammography, DBT, and CEM

 

Median (interquartile range)

Parameter

DM

DBT

CEM

Tube voltage (kVp)

31.0 (26.0–34.0)

31.5 (27.5–34.0)

LE = 29.5 (26.0–34.0)

HE = 49.0 (45.0–49.0)

Exposure (mAs)

51.7 (30.2–94.9)

44.7 (32.7–59.2)

LE = 61.0 (33.5–134.6)

HE = 102.8 (73.3–106.6)

MGD (mGy)

1.135 (0.772–1.668)

1.257 (0.971–1.863)

LE = 1.280 (0.937–1.878)

HE = 0.630 (0.397–0.713)

CNR

14.2 (7.8–20.2)

4.91 (2.58–7.20)a

LE = 11.9 (8.0–18.2)

HE = 5.2 (3.6–9.2)

FOM

141.5 (73.9–388.5)

150.4 (73.6–409.8)b

LE = 114.0 (47.5–268.3)

HE = 63.0 (24.0–119.9)

  1. These values were derived from the full distributions for each modality, which include data from all phantom thickness, systems, and AEC modes. For CEM, median values and IQRs are provided separately for LE and HE images
  2. CEM Contrast-enhanced mammography, CNR Contrast-to-noise ratio, DBT Digital breast tomosynthesis, DM Digital mammography, FOM Figure-of-merit, IQR Interquartile range, HE High-energy image, LE Low-energy image, MGD Mean glandular dose
  3. aThe CNR in DBT was calculated only for the 0° projection
  4. bFOM in DBT was calculated considering the CNR of the 0° projection and the MGD for a single projection
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