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The Hologic Selenia Dimensions system acquires 15 projections, spaced evenly, over a 15° angular range, with the center projection (tomosynthesis angle = 0°) perpendicular to the image detector plane. The source-to-imager distance is 70 cm, with a 2.5-cm air gap between the detector and the breast support plate. The image detector measures 24 × 28 cm. (Image not to scale).
