Focal Spot Blur Reduction by Deconvolution on CT Projections
High-energy X-ray sources typically generate X-rays from a larger focal spot. This enables the imaging of dense objects but can lead to reduced image quality due to increased geometric unsharpness. This paper investigates and compares computational methods for reducing the resulting blur. Two appr...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
NDT.net
2025-02-01
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| Series: | e-Journal of Nondestructive Testing |
| Online Access: | https://www.ndt.net/search/docs.php3?id=30762 |
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| Summary: | High-energy X-ray sources typically generate X-rays from a larger focal spot. This enables the imaging of dense objects but can lead to reduced image quality due to increased geometric unsharpness. This paper investigates and compares computational methods for reducing the resulting blur. Two approaches for acquiring the focal spot blur intensity profile are explored, as well as the subsequent removal of the induced blur in the CT projections via deconvolution. The modified CT projections are reconstructed using standard filtered backprojection (FBP) to assess the blur reduction performance. The results of the deconvolution approaches are evaluated both in 2D (projection) space and in 3D (reconstruction) space using spatial resolution, contrast-to-noise, and qualitative analyses.
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| ISSN: | 1435-4934 |