3-DIMENSIONAL DIFFERENTIAL ABSORPTION X-RAY CONE-BEAM MICROTOMOGRAPHYUSING BALANCED FILTERS AND ALGEBRAIC RECONSTRUCTION

A new x-my tomographic method to image a particular element is propose d and described. This method uses an x-my tube spectrum and a pair of balanced filters with absorption edges just above and just below the e dge of the desired element. The proposed system consists of a microfoc us x-my tube as an x-my source and a 2-D detector array to collect pro jection data. The main advantage of this system over traditional diffe rential tomography using two monoenergetic sources is its easy applica tion to fan-beam or cone-beam geometry without reducing too much its i ntensity. ART is used to reconstruct the 3-D images from the simulated projection data generated by a Monte Carlo program. Computer experime nts demonstrate the feasibility of selective imaging in cone-beam geom etry.