Ms. Xiaoran Sun Profile

Xiaoran Sun

at Tianjin Univ

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Proceedings Article | 21 February 2017 Paper

MTF evaluation of in-line phase contrast imaging system

Xiaoran Sun, Feng Gao, Huijuan Zhao, Limin Zhang, Jiao Li, Zhongxing Zhou

Proceedings Volume 10074, 100741J (2017) https://doi.org/10.1117/12.2250480

KEYWORDS: Phase contrast, Imaging systems, X-ray imaging, X-rays, Image quality, Phase shifts, Modulation transfer functions, Sensors, Breast, Tissues

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X-ray phase contrast imaging (XPCI) is a novel method that exploits the phase shift for the incident X-ray to form an image. Various XPCI methods have been proposed, among which, in-line phase contrast imaging (IL-PCI) is regarded as one of the most promising clinical methods. The contrast of the interface is enhanced due to the introduction of the boundary fringes in XPCI, thus it is generally used to evaluate the image quality of XPCI. But the contrast is a comprehensive index and it does not reflect the information of image quality in the frequency range. The modulation transfer function (MTF), which is the Fourier transform of the system point spread function, is recognized as the metric to characterize the spatial response of conventional X-ray imaging system. In this work, MTF is introduced into the image quality evaluation of the IL-PCI system. Numerous simulations based on Fresnel - Kirchhoff diffraction theory are performed with varying system settings and the corresponding MTFs were calculated for comparison. The results show that MTF can provide more comprehensive information of image quality comparing to contrast in IL-PCI.

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