Mr. Yongchao Li Profile

Yongchao Li

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Proceedings Article | 10 September 2019 Paper

Effect of tube setting variables on image quality in industrial x-ray computed tomography

Xiaoqi Xi, Zhaoying Sun, Yu Han, Lei Li, Bin Yan, Yongchao Li

Proceedings Volume 11113, 111131U (2019) https://doi.org/10.1117/12.2531796

KEYWORDS: Signal to noise ratio, Image quality, X-ray computed tomography, Modulation transfer functions, Spatial resolution, Computed tomography, CT reconstruction

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To investigate the effects of x ray tube setting on image quality in industrial computed tomography, an experimental characterization with constant tube powers has been reported in this paper. A series of CT scans for a QRM Medium-Contrast-Phantom were performed with a constant tube power of 40W and other scanning parameters, varying tube voltages from 80kV to 125kV and tube currents from 320μA to 500μA. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) measured on the reconstructed images indicated that increasing the tube voltage can improve the SNR, as well as the CNR in high density areas. While in low density regions in the phantom, higher CNR resulted from lower voltage or higher tube current. Furthermore, a custom-made aluminum cylinder is scanned several times for the assessment of the CT spatial resolution, similarly keeping a constant tube power and variable tube voltages and currents. According to the obtained modulation transfer function (MTF)_1/10 values, defined as the spatial frequency corresponding to a contrast loss of 10 %, it is found that using the same tube power, the tube voltage has a greater impact on improving the CT spatial resolution.

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