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Proceedings Paper

Direct iterative reconstruction of computed tomography trajectories (DIRECTT)
Author(s): M. P. Hentschel; A. Lange; J. Schors
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Paper Abstract

The direct reconstruction approach employs a new iterative procedure by collecting projected trajectory data of selected volume elements of the sample and add them partially up in a reconstruction matrix. Repetitive application solves the problem of reversing the overlap of projected trajectories without Fourier filtering. This avoids the blur effects of the classical Fourier method due to the sampling theorem. But longer computing time is required. Under optimal conditions the spatial resolution of the reconstructed image is better than that of the detector. Any set of projection angles may be selected. Limited rotation of the object yields good reconstruction of details. Projections of a partial region of the object can be reconstructed very well thus reducing the overall radiation dose in medical applications. Noisy signal data have low impact on spatial resolution. The image quality is monitored during all iteration steps and is pre-selected according to the specific requirements. DIRECTT is suitable for any tomography equipment, also in addition to conventional reconstruction or as a refinement filter.

Paper Details

Date Published: 9 May 2005
PDF: 7 pages
Proc. SPIE 5766, Testing, Reliability, and Application of Micro- and Nano-Material Systems III, (9 May 2005); doi: 10.1117/12.600888
Show Author Affiliations
M. P. Hentschel, Federal Institute for Materials Research and Testing (Germany)
A. Lange, Federal Institute for Materials Research and Testing (Germany)
J. Schors, Federal Institute for Materials Research and Testing (Germany)


Published in SPIE Proceedings Vol. 5766:
Testing, Reliability, and Application of Micro- and Nano-Material Systems III
Robert E. Geer; Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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