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Radiation Protection Dosimetry Advance Access published online on February 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci743
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Leuvens Special Issue Article

AEC SET-UP OPTIMISATION WITH COMPUTED RADIOGRAPHY IMAGING

S. Mazzocchi 1 *, G. Belli 1, S. Busoni 1, C. Gori 1, I. Menchi 2, P. Salucci 3, A. Taddeucci 1, and G. Zatelli 3

1 S.O.D. Fisica Sanitaria, Azienda Ospedaliero-Universitaria Careggi, Viale Pieraccini 17, Firenze, Italy
2 Area Funzionale Diagnostica per Immagini, Azienda USL10 di Firenze, Piazza Santa Maria Nuova 1, Firenze, Italy
3 S.S. Fisica Sanitaria, Azienda USL10 di Firenze, Borgo Ognissanti 20, Firenze, Italy

* To whom correspondence should be addressed.
S. Mazzocchi, E-mail: silvia.mazzocchi{at}asf.toscana.it


  Abstract

Phototimer set-up is a critical procedure for dose and image quality optimisation in computed radiography (CR) systems. While a conventional radiography automatic exposure control device (AEC) can be calibrated in order to gain a constant optical density on the film independent of beam quality and patient size, CR detectors present a high dynamic range which allows a much larger dose interval, but with different image quality levels. CR leads to a less frequent exam repetition, but may produce quite noisy images if the exposure level on the plate is not correct. The aim of this work is to evaluate the performance of a CR plate (Agfa MD40) in order to optimally calibrate an AEC device. The plate response has been characterised in terms of digital signal, exposure on the plate and signal-to-noise ratio for different beam qualities, in a patient of standard size.


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