Digital Mammography by Peter Hogg Judith Kelly & Claire Mercer

Author:Peter Hogg, Judith Kelly & Claire Mercer
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Optimisation of Digital Mammography

The linear response and wide dynamic range of digital mammographic receptors means that images can be successfully acquired over a large range of doses. This provides a number of possibilities for optimisation and dose reduction, but equally also allows sub-optimal systems to acquire images at higher patient doses than are necessary. The phenomenon of ‘exposure creep’ has been identified in general digital radiography, where average patient doses can rise due to the natural human inclination to make the images look better, and the fact that images are not rejected for being ‘too good’. In digital mammography a universal approach to dose optimisation is a still distant goal (although much research is in progress), but initial findings in well-controlled programmes with properly calibrated automatic exposure devices are that average patient doses with new digital units are lower than those for the screen-film systems they replaced. Modern automatic exposure control software may offer alternative combinations of automatic exposure factors that either optimise for contrast (at the expense of dose) or dose (at the expense of poorer contrast-to-noise ratio).

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.