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BACKGROUND: Limited-angle problem occurs in many applications of X-raycomputed tomography (CT) and it will lead to artifacts.OBJECTIVE: In this paper, we present the tomographic imaging of pipelinewhich is in service by cone-beam computed tomography (CBCT). And our purposeis to suppress the artifacts caused by the limited-angle problem.METHODS: First, traditional helical scanning strategy is adopted for thepipeline where can be fully scanned, and the slices with less or no defectsfrom the reconstructed image are selected to constitute the prior image.Then a limited-angle reverse helical scanning strategy is developed for thepipeline where can be scanned within limited angular range. Second,considering the constraint of the prior image and the resemblance amongslices of pipeline, an image model which incorporates the Schattenp(0<p<1)-norm penalty term is developed. Finally, split Bregmanalgorithm based method is utilized to solve the model.RESULTS: Numerical results show that our method is efficient and feasible insuppressing artifacts and it is superior to popular methods when the angularrange is small.CONCLUSION: The developed method is promising in suppressing the artifactsin limited-angle problems, and it can be potentially used in pipelinetesting.
Journal of X-Ray Science and Technology – IOS Press
Published: Dec 17, 2015
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