Experimental study of the impact of small-angle scatterers on the x-ray dark field imaging contrast mechanism

Nicholas Bevins; Joseph Zambelli; Ke Li; Zhihua Qi; Guang-Hong Chen

doi:10.1117/12.911560

8 March 2012 Experimental study of the impact of small-angle scatterers on the x-ray dark field imaging contrast mechanism

Nicholas Bevins, Joseph Zambelli, Ke Li, Zhihua Qi, Guang-Hong Chen

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83135L (2012) https://doi.org/10.1117/12.911560
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

Interest in grating-based x-ray interferometry has grown rapidly in recent years, due in part to the systems ability to simultaneously provide images of multiple contrast mechanisms within a single acquisition. In addition to the well known absorption and phase contrast images, a third image of local small angle scattering known as the dark-field image is produced. There are limited published results describing applications of this method in medical imaging. In this work, the dark-field contrast mechanism is examined in the context of medical imaging. Experimental results demonstrate the relationship of both the size of the scatterers and their electron density and the resulting dark-field signal strength. The dark-field images are produced using both the well-known phase stepping technique and the recently reported moir´e technique. The results show that dark-field signal strength increases with increased difference in electron density from the background and with decreased scatterer size. They also demonstrate the equivalence of the resulting data using either signal extraction technique.

Citation Download Citation

Nicholas Bevins, Joseph Zambelli, Ke Li, Zhihua Qi, and Guang-Hong Chen "Experimental study of the impact of small-angle scatterers on the x-ray dark field imaging contrast mechanism", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135L (8 March 2012); https://doi.org/10.1117/12.911560

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