Half-scan cone-beam x-ray microtomography formula.

An x-ray shadow projection microtomographic system using a scannable point source is under development at AMIL-ARTS, SUNY at Buffalo. To overcome the limitations of the commonly used Feldkamp's cone-beam reconstruction formula, we have developed a generalized Feldkamp-type cone-beam reconstruction formula. In the generalized Feldkamp-type cone-beam reconstruction, a scanning locus can be either planar or helix-like, and a transaxial slice is reconstructed using projection data collected from a 360 degrees angular range (full scan). In this paper, the full-scan cone-beam formula is modified to require only projection data of approximate 180 degrees plus two fan-angles (half scan). First, a half-scan derivative-free noncircular fan-beam reconstruction formula is formulated. Then, a half-scan cone-beam reconstruction formula is derived as an extension of the half-scan fan-beam reconstruction formula using Feldkamp's procedure. Typical numerical simulation results are given for both half-scan formulae. Compared with the full-scan cone-beam formula, the half-scan cone-beam formula reduces the involved angular range of projection data and allows better longitudinal/temporal resolution.

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

[2]  Bruce D. Smith.  Cone-beam tomography: recent advances and a tutorial review , 1990 .

[3]  S. P. Newberry,et al.  X-Ray Microradiography and Shadow Projection X-Ray Microscopy , 1990 .

[4]  K F King,et al.  Computed tomography scanning with simultaneous patient translation. , 1990, Medical physics.

[5]  S. P. Newberry,et al.  Projection microscopy and microtomography using X-rays , 1991 .

[6]  G T Gullberg,et al.  Review of convergent beam tomography in single photon emission computed tomography. , 1992, Physics in medicine and biology.

[7]  W. Kalender,et al.  Evaluation of section sensitivity profiles and image noise in spiral CT. , 1992, Radiology.

[8]  M W Vannier,et al.  Spiral CT: decreased spatial resolution in vivo due to broadening of section-sensitivity profile. , 1992, Radiology.

[9]  Gengsheng Lawrence Zeng,et al.  A cone-beam filtered backprojection reconstruction algorithm for cardiac single photon emission computed tomography , 1992, IEEE Trans. Medical Imaging.

[10]  Ge Wang,et al.  Cone-beam reconstruction of plate-like specimens , 1992 .

[11]  D. M. Shinozaki,et al.  Point spread function of the general cone‐beam x‐ray reconstruction formula , 1992 .

[12]  Ge Wang,et al.  A derivative-free noncircular fan-beam reconstruction formula , 1993, IEEE Trans. Image Process..

[13]  G. Wang,et al.  A general cone-beam reconstruction algorithm , 1993, IEEE Trans. Medical Imaging.