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A comparison of the performance of modern screen-film and digital mammography systems

P Monnin1, D Gutierrez1, S Bulling1, D Lepori2, J-F Valley1 and F R Verdun1

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This work compares the detector performance and image quality of the new Kodak Min-R EV mammography screen-film system with the Fuji CR Profect detector and with other current mammography screen-film systems from Agfa, Fuji and Kodak. Basic image quality parameters (MTF, NPS, NEQ and DQE) were evaluated for a 28 kV Mo/Mo (HVL = 0.646 mm Al) beam using different mAs exposure settings. Compared with other screen-film systems, the new Kodak Min-R EV detector has the highest contrast and a low intrinsic noise level, giving better NEQ and DQE results, especially at high optical density. Thus, the properties of the new mammography film approach those of a fine mammography detector, especially at low frequency range. Screen-film systems provide the best resolution. The presampling MTF of the digital detector has a value of 15% at the Nyquist frequency and, due to the spread size of the laser beam, the use of a smaller pixel size would not permit a significant improvement of the detector resolution. The dual collection reading technology increases significantly the low frequency DQE of the Fuji CR system that can at present compete with the most efficient mammography screen-film systems.


PACS

87.59.E- Mammography

87.57.C- Image quality

87.63.-d Non-ionizing radiation equipment and techniques

Subjects

Medical physics

Dates

Issue 11 (7 June 2005)

Received 13 January 2005, in final form 13 April 2005

Published 18 May 2005



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