Abstract
In industrial computed tomography (CT), it is often required to inspect large objects whose size is beyond a reconstructed field of view (FOV). Some multiscan modes have been developed to acquire the complete CT projection data for a larger object using small panel detectors. In this paper, we give a non-concyclic dual-source circular cone-beam scanning geometry based on the idea of multiscan modes and propose a backprojection-filtration-based (BPF) reconstruction algorithm without data rebinning. Since the FOV calculated according to this nonconcyclic dual-source circular CT scanning geometry is larger than cardiac dual-source CT scanning geometry, our method can reconstruct larger horizontal slices (i.e., the slices perpendicular to rotation axis) than cardiac dual-source CT. The quality of CT images is expected to be superior to those obtained using larger panel detectors. The simulation results have indicated that CT images obtained by the proposed method are satisfying.
Highlights
In industrial computed tomography (CT), it is often required to inspect large objects whose size is beyond a field of view (FOV) calculated according to CT scanning geometry, where the maximum horizontal FOV is usually fixed in CT system
In industrial computed tomography (CT), it is often required to inspect large objects whose size is beyond a reconstructed field of view (FOV)
We give a non-concyclic dual-source circular cone-beam scanning geometry based on the idea of multiscan modes and propose a backprojection-filtration-based (BPF) reconstruction algorithm without data rebinning
Summary
In industrial CT, it is often required to inspect large objects whose size is beyond a field of view (FOV) calculated according to CT scanning geometry, where the maximum horizontal (i.e., perpendicular to rotation axis) FOV is usually fixed in CT system. Conventional CT reconstruction algorithm, for example, filtered backprojection (FBP), requires the complete projection data. Those conventional scan modes and reconstruction methods can not be used. To solve this problem, several multiscan modes have been developed to acquire the complete projection data. For fan-beam RT multiscan modes, the reconstruction algorithm based on backprojection- filtration (BPF) was proposed by Chen et al [5, 6], which can exactly reconstruct the images and does not introduce data rebinning. We give a nonconcyclic dual-source circular cone beam scanning geometry based on the idea of RT multiscan scan mode and propose a BPF-based reconstruction formula. There are some results in [10, 11]
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