Feldkamp-type cone-beam tomography in the wavelet framework

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...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 2000-09, Vol.19 (9), p.922-929
Main Authors: Zhao, S, Wang, G
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Biomedical imaging
Computational efficiency
Computational geometry
Computational modeling
Computed tomography
Head - diagnostic imaging
Humans
Image Processing, Computer-Assisted
Image reconstruction
Investigative techniques, diagnostic techniques (general aspects)
Ionizing radiation
Medical sciences
Medical simulation
Mice
Miscellaneous. Technology
Phantoms, Imaging
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Rats
Tomography, X-Ray Computed - methods
Two dimensional displays
X-ray imaging
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Summary: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, the authors are motivated to perform wavelet local CT in cone-beam geometry. In this paper, they 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 the authors' simulation and experiments.
ISSN:0278-0062
1558-254X
DOI:10.1109/42.887839