Screen-film mammography

Fig. 1.4. (a) Characteristic (H and D) curve of a mam-mographic screen-film system. Optical density (OD) of the processed film is plotted versus the log of the relative X-ray exposure to the fluorescent intensifying screen, (b) Characteristic response of a detector designed for digital mammography (from Pisano et al. 2004. With permission)... 

Fig. 1.7. MTF of a modern screen-film system (after Bunch Fig. 1.8. Illustrating the concept of aliasing (from Pisano 1997) and of a typical detector used in digital mammography et al. 2004. With permission)...

X-rays transmitted by the breast. The detector is designed to overcome several of the limitations inherent in the screen-film image receptor used in analog mammography, and in so doing, potentially provides improved diagnostic image quality and a reduction of dose to the breast. 

Fig. 2.11. Slot-format scanned CCD detector with CsI Tl phosphor (Reprinted from Radiologic Clinics of N. America, 38 4 Haus AG and Yaffe MJ, Screen-Film and Digital Mammography, pp 871-898, (2000). With permission from Elsevier)...

Sample MTFs of several commerdal digital mammography systems are compared with the MTF of a modern screen-film mammography system in Fig. 2.16. As will be discussed here, factors additional to the dd aperture, d, also affect the MTF of detectors used for digital mammography. In some cases, these cause the ordering of the curves not to corrdate with the dd sizes. 

Fig. 2.18. Spatial-frequency dependent DQE of screen-film mammography and some digital mammography systems (Data on GE systems from Ghetti et al. (2008), Fuji and Anrad systems from Rivetti et al. (2006), Selenia from Laz-ZARiA et al. (2007), Sectra from Monnin et al..(2007) and screen-film from Bunch (1999)...

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