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Table 1 Characteristics of mammograms and of women with raw–processed image pairs and SFM–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 Processed digital–SFM pairs
  Set H1 Set H2 Set H3 Set G1 Set G2 Set F1 Set F2
Mammography system Hologic (DD) GE Medical Systems (DD) Fuji (CR) Fuji (SFM and CR)
Mammography machine Lorad Selenia Senographe 2000D Senographe Essential (152 pairs), Senographe DS (87 pairs) Clearview CSm
Views L MLO L MLO L CC or R CC L CC or R CC L MLO L CC and R CC R CC
Pixel size (μm) 70 70 NK NK 94 (91%), 100 (9%) 50 SFM: 50 (33%), 200 (67%); CR 50 (50%), 100 (50%)
Processing software version AWS 3_3_1 AWS 3_4_1 NK NK ADS_43.10.1 (34.2%), ADS_54.10 (56.9%), ADS_54.11 (8.9%)   
Number of image pairs 186 73 417 180 238 200 139
Number of women 186 73 417 180 238 100 139
Source of films Chilean Cohort Study of Breast Cancer Risk (in ICMD) Bahcesehir screening programme, Turkey H. Lee Moffitt Cancer Centre, USA H. Lee Moffitt Cancer Centre, USA East London Breast Screening Centre, UK (in ICMD) NK BreastScreen Victoria, Australia
Yeara 2011–2013 2010–2011 2008–2010 2007–2011 2010–2012 2008 2004–2009
Agea (years), mean (SD) 41.0 (4.4) 49.5 (7.5) 63.5 (10.7) 58.5 (10.4) 58.0 (5.8) 55.1 (12.8)b 57.9 (5.1) first screen, 60.0 (5.1) second
BMIc (kg/m2), median (IQR) 27.6 (24.9–32.1) NK 27.6 (24.3–32.4) 24.7 (22.3–27.0) 24.6 (22.5–28.8) NK NK
  1. aAt the time of mammography
  2. bAge was known for 47 of 100 women only. Set F1: both R CC and L CC images were saved in raw and processed formats, therefore there are 100 women and 200 image pairs
  3. cBMI at or near to mammography
  4. L left, R right, CC craniocaudal, MLO mediolateral oblique, GE General Electric, SFM screen-film mammography, DD direct digital, CR computed radiography, IMCD International Consortium on Mammographic Density, IQR interquartile range, NK not known, SD standard deviation