Detectability index of differential phase contrast CT compared with conventional CT: a preliminary channelized Hotelling observer study

Xiangyang Tang; Yi Yang; Shaojie Tang

doi:10.1117/12.2008015

6 March 2013 Detectability index of differential phase contrast CT compared with conventional CT: a preliminary channelized Hotelling observer study

Xiangyang Tang, Yi Yang, Shaojie Tang

Author Affiliations +

Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 866854 (2013) https://doi.org/10.1117/12.2008015
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Under the framework of model observer with signal and background exactly known (SKE/BKE), we investigate the detectability of differential phase contrast CT compared with that of the conventional attenuation-based CT. Using the channelized Hotelling observer and the radially symmetric difference-of-Gaussians channel template , we investigate the detectability index and its variation over the dimension of object and detector cells. The preliminary data show that the differential phase contrast CT outperforms the conventional attenuation-based CT significantly in the detectability index while both the object to be detected and the cell of detector used for data acquisition are relatively small. However, the differential phase contrast CT’s dominance in the detectability index diminishes with increasing dimension of either object or detector cell, and virtually disappears while the dimension of object or detector cell approaches a threshold, respectively. It is hoped that the preliminary data reported in this paper may provide insightful understanding of the differential phase contrast CT’s characteristic in the detectability index and its comparison with that of the conventional attenuation-based CT.

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Xiangyang Tang, Yi Yang, and Shaojie Tang "Detectability index of differential phase contrast CT compared with conventional CT: a preliminary channelized Hotelling observer study", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866854 (6 March 2013); https://doi.org/10.1117/12.2008015

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KEYWORDS

Phase contrast

X-ray computed tomography

Sensors

Target detection

X-rays

Data acquisition

Computed tomography

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