Ultrafast three-dimensional x-ray computed tomography

X-ray computed tomography (CT) is a well established visualization technique in medicine and nondestructive testing. However, since CT scanning requires sampling of radiographic projections from different viewing angles, common CT systems with mechanically moving parts are too slow for dynamic imaging, for instance of multiphase flows or live animals. Here, we introduce an ultrafast three-dimensional x-ray CT method based on electron beam scanning, which achieves volume rates of 500 s−1. Primary experiments revealed the capability of this method to recover the structure of phase boundaries in gas-solid and gas-liquid two-phase flows, which undergo three-dimensional structural changes in the millisecond scale.

[1]  Milorad P. Dudukovic,et al.  Frontiers in Reactor Engineering , 2009, Science.

[2]  Kamel Fezzaa,et al.  Ultrafast X-ray study of dense-liquid-jet flow dynamics using structure-tracking velocimetry , 2008 .

[3]  D. C. Barber,et al.  Three-dimensional electrical impedance tomography , 1996, Nature.

[4]  U. Hampel,et al.  An ultra fast electron beam x-ray tomography scanner , 2008 .

[5]  L. Gladden,et al.  Dynamic MRI visualization of two‐phase flow in a ceramic monolith , 2002 .

[6]  A J Sederman,et al.  Real-time measurement of bubbling phenomena in a three-dimensional gas-fluidized bed using ultrafast magnetic resonance imaging. , 2006, Physical review letters.

[7]  Development of an ultrafast X-ray computed tomography scanner system : Application for measurement of instantaneous void distribution of gas-liquid two-phase flow , 2000 .

[8]  Avinash C. Kak,et al.  Principles of computerized tomographic imaging , 2001, Classics in applied mathematics.

[9]  U. Hampel,et al.  Experimental two-phase flow measurement using ultra fast limited-angle-type electron beam X-ray computed tomography , 2009 .

[10]  Troy Shinbrot,et al.  A Taylor vortex analogy in granular flows , 2004, Nature.

[11]  G. Herman,et al.  Algebraic reconstruction techniques (ART) for three-dimensional electron microscopy and x-ray photography. , 1970, Journal of theoretical biology.

[12]  Z. Warhaft,et al.  Acceleration statistics of neutrally buoyant spherical particles in intense turbulence. , 2009, Physical review letters.

[13]  L. Feldkamp,et al.  Practical cone-beam algorithm , 1984 .

[14]  B. T. Hjertaker,et al.  A dual sensor flow imaging tomographic system , 1996 .

[15]  James A. Sethian,et al.  Level Set Methods and Fast Marching Methods , 1999 .

[16]  E. Beiting,et al.  Fast optical absorption tomography. , 1991, Optics letters.

[17]  Uwe Hampel,et al.  Ultrafast cross‐sectional imaging of gas‐particle flow in a fluidized bed , 2009 .

[18]  Uwe Hampel,et al.  Ultrafast limited-angle-type x-ray tomography , 2007 .