caa a22 4500 397502079 CHVBK 20180308164535.0 cr unu---uuuuu 161202e19950101xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082514 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082514 Optimisation of Image Quality in Mammography [Elektronische Daten] [K.J. Robson, C.J. Kotre, K. Faulkner] In mammography it is particularly important that the maximum amount of diagnostic information is obtained from each radiograph. One of the factors influencing image quality is the optical density of the film. In this work the Newcastle contrast-detail test object was used to establish the optimum optical density value for one film-screen combination. Films taken using various mA.s values were developed in a nominally optimised film processor to mimic the real situation. The films were then viewed under optimum conditions on a variable brightness lightbox and the threshold contrast for each disc size calculated. Threshold contrast was plotted against optical density for each disc size and a curve fitted through the points. The optimum optical density, taken as being the point at which the threshold contrast is a minimum varied little with disc size. Averaged over all disc sizes the value of optimum density for this particular case was found to be 1.71 OD. Radiation Protection Dosimetry Robson K.J. aut Kotre C.J. aut Faulkner K. aut Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 151-154 0144-8420 57:1-4<151 1995 57 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082514 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082514 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Robson K.J. aut NATIONALLICENCE 700 1- Kotre C.J. aut NATIONALLICENCE 700 1- Faulkner K. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 151-154 0144-8420 57:1-4<151 1995 57 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford