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Table 2 Percent density, dense area and total breast area in raw–processed image pairs and in SFM–processed digital image pairs

From: Mammographic density assessed on paired raw and processed digital images and on paired screen-film and digital images across three mammography systems

  Raw–processed image pairs SFM–digital
Hologic GE Fuji All Fuji CR
Number of women   676 418 100 1194 128
Number of image pairs   676 418 200 1294 128
Number of image pairs by view L MLO 259 238 0 497  
L CC 208 79 100 387  
R CC 209 101 100 410 128
All 676 418 200 1294 128
Number of potential MD readings (including 22% repeats), by reader Reader 1 234 232 60 526 0
Reader 2 246 218 60 524 0
Reader 3 232 222 460 914 283
Reader 4 834 360 0 1194 0
All 1546 1032 580 3158 283
PMDa (%) Raw 15.4 (6.7–27.7) 18.5 (8.5–32) 23.1 (12.5–34.3) 18.1 (8.6–30.5) SFM: 22.2 (15.6–28.5)
  Processed 18.7 (11.4–27.9) 21.8 (11.3–35.7) 24.8 (13.4–36.6) 20.2 (11.7–31.7) 18.9 (13.0–26.9)
Dense areaa (cm2) Raw 23.6 (12.1–41.3) 25.0 (11.7–40.3) 28.8 (19.9–45.3) 25.4 (13.5–41.7) SFM: 32.4 (22.4–43.2)
  Processed 28.2 (19–41.9) 27.6 (16.1–47.6) 30.4 (20.3–50.7) 28.5 (18.2–44.8) 28.9 (20.3–38.1)
Breast areaa (cm2) Raw 166.9 (127.9–216.1) 138.4 (108.4–173.1) 152.9 (111.4–207.1) 155.8 (116.9–201.3) SFM: 154.4 (119.1–193.1)
  Processed 167.3 (127.5–214.4) 140.1 (109.9–175) 150.7 (112.7–206.2) 156.1 (117.3–201.5) 156.7 (122.7–202.1)
  1. aMedian (interquartile range)
  2. L left, R right, CC craniocaudal, MLO mediolateral oblique, GE General Electric, SFM screen-film mammography, CR computed radiography, PMD percent mammographic density assessed in Cumulus version 6