Assessment of the image contrast improvement and dose reduction in mammography with synchrotron radiation compared to standard units

An objective method was used to evaluate image quality and dose in mammogra phy with synchrotron radiation and to compare them to standard units. It wa s performed systematically in the energy range of interest for mammography through the evaluation of the contrast and the measurement of the mean glan dular dose. Synchrotron radiation measurements were performed at the ESRF a nd a slit was placed between the test object and the screen-film system in order to reduce scatter. The conventional films were obtained on mammograph y units with an anti-scatter grid. In a recent paper, it was shown that the use of synchrotron radiation leads to a noticeable improvement of the imag e quality-dose relationship (Moeckli et al. Phys. Med. Biol. 45(12)3509). T he reason of that enhancement is partly due to the monochromaticity of the synchrotron beam and partly due to the use of a slit instead of a grid. The dose reduction with synchrotron radiation can be attributed to a better X- ray total transmission of the slit and the contrast improvement is due to t he monochromaticity of the synchrotron beam. (C) 2001 Elsevier Science B.V. All rights reserved.