Fourier-based forward and back-projectors in iterative fan-beam tomographic image reconstruction. Zhang-O'Connor, Y. and Fessler, J. A. IEEE Trans. Med. Imag., 25(5):582–9, May, 2006.
doi  bibtex   
@ARTICLE{zhangoconnor:06:fbf,
	author =	{Y. Zhang-O'Connor and J. A. Fessler},
	title =		{Fourier-based forward and back-projectors in iterative fan-beam tomographic image reconstruction},
	journal =	{{IEEE Trans. Med. Imag.}},
	volume =	25,
	number =	5,
	pages =		{{582--9}},
	month =		may,
	pm =	16689262,
	errata = {The claim that the method generalizes to helical CT is over-stated.
In principle it could be generalized, but how to make it efficient is unclear.
},
	doi =		{10.1109/TMI.2006.872139},
	year =		2006
}
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