3RADON J. l~ber die bestimmung yon funktionen durch ihre integralwerte langs gewisser manningfahigkeiten [ J ]. Berichte Saechsische Akad Wiss,1917 ,69 :262-277.
4SHEPP L A, LOGAN B F. The Fourier reconstruction of the head section [ J ]. IEEE Trans on Nuclear Sci, 1974, NS-21 (3) :21.
5HERMAN G T. Image reconstruction from projections: implementation and applications [ M ]. Springer-Verlag, 1979.
6LANGE K, CARSON R. EM reconstruction algorithms for emission and transmission tomography [ J ]. Journal of Computer Assisted Tomography, 1984, 8 (2) :306-316.
7CHAOUKI J, LARACHI F. Noninvasive tomographic and velocimetric monitoring of multiphase flows [ J ]. Ind & Eng Chem Research, 1997, 36(11) :4476-4503 .
8THIYAGARAJAN T K, SATYAMURTHY P, DIXIT N S, et al. Void fraction profile measurements in two-phase mercury-nitrogen flows using gamma-ray attenuation method [J]. Experimental Thermal and Fluid Science, 1995,10 (3) :347-35.
9BOYER C, FANGET B. Measurement of liquid flow distribution in trickle bed reactor of large diameter with a new gamma-ray tomographic system [ J ]. Chemical Engineering Science, 2002, 57 (7) : 1079-1089.
10MARKUS S, GUNTHER H. Liquid flow texture analysis in trickle bed reactors using high-resolution gamma ray tomo- graphy [ J ]. Chemical Engineering Journal ,2008,140 ( 1/2/ 3 ) :332-340.