Computed tomography with monochromatic bremsstrahlung radiation

The use of filters with appropriate thickness of different elements produce s a method to quasi-monochromatize Xray beams. In the present study the fil ters were produced in a boric acid matrix, using the elements Mo, Sb, Ca, C e and Gd. The thickness of the filters varied from 50 to 300 mu m for a hig h voltage tube operating from 30 to 70 kVp. The parameters analyzed were th e beam resolution, measured by its FWHM as a function of filter thickness, and the reduction of beam intensity. The results show a comparison between conventional tomographies obtained with different filters and application i n the technique of differential tomography, with double energy for identifi cation of elements such as Zr, Nd, Ba and Sm. (C) 2000 Elsevier Science Ltd . All rights reserved.