title: Should processed or raw image data be used in mammographic image quality analyses? A comparative study of three full-field digital mammography systems.
abstract: The purpose of this study is to compare a number of measured image quality parameters using processed and unprocessed or raw images in two full-field direct digital units and one computed radiography mammography system. This study shows that the difference between raw and processed image data is system specific. The results have shown that there are no significant differences between raw and processed data in the mean threshold contrast values using the contrast-detail mammography phantom in all the systems investigated; however, these results cannot be generalised to all available systems. Notable differences were noted in contrast-to-noise ratios and in other tests including: response function, modulation transfer function , noise equivalent quanta, normalised noise power spectra and detective quantum efficiency as specified in IEC 62220-1-2. Consequently, the authors strongly recommend the use of raw data for all image quality analyses in digital mammography.
authors.affiliation: Faculty of Health Science, Medical Physics Department, University of Malta, Tal-Qroqq, Msida MSD2090, Malta mark.b.borg@um.edu.mt.
authors.forename: Mark
authors.initials: M
authors.lastname: Borg
authors.affiliation: Radiological Protection Centre, St George's Healthcare NHS Trust, London SW17 0QT, UK.
authors.forename: Ishmail
authors.initials: I
authors.lastname: Badr
authors.affiliation: Department of Medical Physics and Bioengineering, University College London, London WC1E 6BT, UK.
authors.forename: Gary
authors.initials: G
authors.lastname: Royle
mesh_terms: D001943:Breast Neoplasms / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008327:Mammography / Q000379:methods / Q000592:standards* / Q000706:statistics & numerical data; D019047:Phantoms, Imaging; D011786:Quality Control; D011856:Radiographic Image Enhancement / Q000379:methods / Q000592:standards*; D059629:Signal-To-Noise Ratio