Computed tomography with monochromatic bremsstrahlung radiation
The use of filters with appropriate thickness of different elements produces a method to quasi-monochromatize X-ray beams. In the present study the filters were produced in a boric acid matrix, using the elements Mo, Sb, Cs, Ce and Gd. The thickness of the filters varied from 50 to 300 microm for a high voltage tube operating from 30 to 70 kVp. The parameters analyzed were the 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 in the technique of differential tomography, with double energy for identification of elements such as Zr, Nd, Ba and Sm.
Lopes
RT
Laboratorio de Instrumentacao Nuclear, COPPE-UFRJ, Rio de Janeiro, Brazil. ricardo@lin.ufrj.br
Costa
EB
de Jesus EF