Spatial resolution improvement of 450  kV computed tomography via vertical subpixel detector shifting.

Spatial resolution improvement of 450 kV computed tomography via vertical subpixel detector shifting. J Xray Sci Technol. 2020 Jan 22;: Authors: Lifton J, Liu T Abstract The 450 kV X-ray sources typically have large focal spot sizes that lead to low spatial resolution of the computed tomography (CT) images. This work developed and tested a new method to improve spatial resolution of CT images generated using the 450 kV X-ray sources. The proposed method relies on using the vertical subpixel detector shifting and deconvolution to generate a projection-set that has double the number of pixels in the direction parallel to the axis of rotation. The experimental results show that the proposed method enables to increase 10% modulation transfer function of the considered CT imaging system from 3 lp/mm to 4 lp/mm. In addition, a scan of a metal component that is additively manufactured with periodic features of approximately 200 μm was used to test and demonstrate the feasibility of the new method. The results showed that small features, which were not fully resolved in a conventional CT scan, become resolvable when the proposed method was used. PMID: 31985484 [PubMed - as supplied by publisher]
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research