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  • Title: K-edge digital subtraction imaging based on a dichromatic and compact x-ray source.
    Author: Sarnelli A, Taibi A, Tuffanelli A, Baldazzi G, Bollini D, Cabal Rodriguez AE, Gombia M, Prino F, Ramello L, Tomassi E, Gambaccini M.
    Journal: Phys Med Biol; 2004 Jul 21; 49(14):3291-305. PubMed ID: 15357198.
    Abstract:
    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.
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