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Phys Med Biol. 2004 Jul 21;49(14):3291-305.

K-edge digital subtraction imaging based on a dichromatic and compact x-ray source.

Author information

  • 1Dipartimento di Fisica dell'Universit√† di Ferrara and INFN Sezione di Ferrara, Via Paradiso 12, I-44100 Ferrara, Italy. sarnelli@fe.infn.it


This work proposes a compact dichromatic imaging system for the application of the K-edge digital subtraction technique based on a conventional x-ray tube and a monochromator system. A quasi-monochromatic x-ray beam at the energy of iodine K-edge is produced by Bragg diffraction on a mosaic crystal. Two thin adjacent beams with energies that bracket the K-edge discontinuity are obtained from the diffracted beam by means of a proper collimation system. They are then detected using an array of Si detectors. A home-made phantom is used to study the image quality as a function of iodine concentration. Signal and signal-to-noise ratio analysis has also been performed. The results are compared with theoretical expectations.

[PubMed - indexed for MEDLINE]
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