Direct iterative reconstruction of computed tomography trajectories (DIRECTT)

M. P. Hentschel; A. Lange; J. Schors

doi:10.1117/12.600888

9 May 2005 Direct iterative reconstruction of computed tomography trajectories (DIRECTT)

M. P. Hentschel, A. Lange, J. Schors

Proceedings Volume 5766, Testing, Reliability, and Application of Micro- and Nano-Material Systems III; (2005) https://doi.org/10.1117/12.600888
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

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.

Citation Download Citation

M. P. Hentschel, A. Lange, and J. Schors "Direct iterative reconstruction of computed tomography trajectories (DIRECTT)", Proc. SPIE 5766, Testing, Reliability, and Application of Micro- and Nano-Material Systems III, (9 May 2005); https://doi.org/10.1117/12.600888

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