  Fast image reconstruction techniques are becoming important with the
increasing number of scientific cases in high resolution micro and nano
tomography. The processing of the large scale three-dimensional data demands
new mathematical tools for the tomographic reconstruction task because of the
big computational complexity of most current algorithms as the sizes of
tomographic data grow with the development of more powerful acquisition
hardware and more refined scientific needs. In the present paper we propose a
new fast back-projection operator for the processing of tomographic data and
compare it against other fast reconstruction techniques.
