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Radiation Protection Dosimetry Advance Access originally published online on February 3, 2006
Radiation Protection Dosimetry 2005 117(1-3):44-49; doi:10.1093/rpd/nci710
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Performance of the K-edge digital subtraction angiography imaging system at the European synchrotron radiation facility

A. Peterzol1,2,*, A. Bravin3, P. Coan4 and H. Elleaume5

1 Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34100 Trieste, Italy
2 Servizio di Fisica Sanitaria, Azienda Ospedaliera S. Maria della Misericordia, 33100 Udine, Italy
3 European Synchrotron Radiation Facility, BP220, 6 rue Horowitz, 38043 Grenoble, France
4 Università degli Studi di Padova, via Marzolo 8, 35131 Padova, Italy
5 Equipe RSRM, BP220, 6 rue Horowitz, 38043 Grenoble, France

* Corresponding author: angela.peterzol{at}insa-lyon.fr

In this work we have characterised the K-edge digital subtraction angiography imaging system at the European Synchrotron Radiation Facility (ESRF, Grenoble, France). With this technique, after the minimally invasive intravenous injection of a contrast agent (iodine), two images are recorded simultaneously using monochromatic beams with energies bracketing the iodine K-edge. The image receptor consists of a two-line 432-pixel germanium detector. The logarithmic subtraction of the image set produced results in an iodine-enhanced image, where vessels are clearly visualised and contrast agent concentration can be precisely quantified. We have studied the imaging system in terms of the modulation transfer function, which was measured at the patient position, the 2-D normalised noise power spectrum, calculated for both raw and processed data, and the frequency-dependent detective quantum efficiency, which was calculated directly for final images. In addition, images of cylindrical phantoms with different concentrations of iodine, were also acquired.


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