Line-Source Based X-Ray Tomography

Current computed tomography (CT) scanners, including micro-CT scanners, utilize a point x-ray source. As we target higher and higher spatial resolutions, the reduced x-ray focal spot size limits the temporal and contrast resolutions achievable. To overcome this limitation, in this paper we propose to use a line-shaped x-ray source so that many more photons can be generated, given a data acquisition interval. In reference to the simultaneous algebraic reconstruction technique (SART) algorithm for image reconstruction from projection data generated by an x-ray point source, here we develop a generalized SART algorithm for image reconstruction from projection data generated by an x-ray line source. Our numerical simulation results demonstrate the feasibility of our novel line-source based x-ray CT approach and the proposed generalized SART algorithm.

[1]  G. Hounsfield.  Computerized transverse axial scanning (tomography). 1. Description of system. , 1973, The British journal of radiology.

[2]  A. Kak,et al.  Simultaneous Algebraic Reconstruction Technique (SART): A Superior Implementation of the Art Algorithm , 1984, Ultrasonic imaging.

[3]  G. Hounsfield.  Computerized transverse axial scanning (tomography): Part I. Description of system. 1973. , 1973, The British journal of radiology.

[4]  M. Glas,et al.  Principles of Computerized Tomographic Imaging , 2000 .

[5]  Paul F. Hemler,et al.  3D Iterative Restoration of Tomosynthetic Images , 2001 .

[6]  Ming Jiang,et al.  Convergence of the simultaneous algebraic reconstruction technique (SART) , 2003, Conference Record of Thirty-Fifth Asilomar Conference on Signals, Systems and Computers (Cat.No.01CH37256).

[7]  Ming Jiang,et al.  Convergence Studies on Iterative Algorithms for Image Reconstruction , 2003, IEEE Trans. Medical Imaging.

[8]  M. Jiang,et al.  Ordered-subset simultaneous algebraic reconstruction techniques (OS-SART) , 2004 .

[9]  P. Schwoebel,et al.  High current, high current density field emitter array cathodes , 2004, IVNC 2004.

[10]  Bruno De Man,et al.  Multi-source inverse geometry CT: a new system concept for x-ray computed tomography , 2007, SPIE Medical Imaging.

[11]  Otto Zhou,et al.  MO‐E‐L100J‐07: Multiplexing Radiography for Ultra‐Fast Computed Tomography: A Feasibility Study , 2007 .

[12]  Donghui Chen,et al.  Nonnegativity constraints in numerical analysis , 2009, The Birth of Numerical Analysis.