Feldkamp-type cone-beam tomography in the wavelet framework.

S Zhao; G Wang

doi:10.1109/42.887839

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Feldkamp-type cone-beam tomography in the wavelet framework.

S Zhao·G Wang

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Abstract

X-ray computed tomography (CT) is in transition from fan-beam to cone-beam geometry. For cone-beam volumetric imaging, reduction of radiation exposure remains an important issue. Because the wavelet approach was shown to be effective and flexible for two-dimensional (2-D) local region reconstruction, we are motivated to perform wavelet local CT in cone-beam geometry. In this paper, we formulate the Feldkamp cone-beam reconstruction from the wavelet perspective, derive both full-scan and half-scan Feldkamp-type formulas for either global or local reconstruction, and demonstrate the feasibility and utility in synthetic and real data. It is found that using the wavelet Feldkamp approach, a three-dimensional (3-D) region of interest (ROI) can be reconstructed with neither severe image artifacts nor any significant constant bias in our simulation and experiments.

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Animals Head Humans Image Processing, Computer-Assisted Mice Phantoms, Imaging Rats Tomography, X-Ray Computed Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

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S Zhao, G Wang. 2000. Feldkamp-type cone-beam tomography in the wavelet framework.. https://doi.org/10.1109/42.887839

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