An iteration algorithm in dual-energy x-ray imaging based on polychromatic physics model

Shaojie Tang; Xuanqin Mou; Tao Luo

doi:10.1117/12.652135

2 March 2006 An iteration algorithm in dual-energy x-ray imaging based on polychromatic physics model

Shaojie Tang, Xuanqin Mou, Tao Luo

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61422R (2006) https://doi.org/10.1117/12.652135
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

In this paper, we aim at a polychromatic physics model of dual-energy medical x-ray imaging and present a corresponding computation method, which includes two steps: first, bd(s, theta), i.e. the parameter used for expressing the component of Compton scatter, and bp(s, theta), i.e. the parameter used for expressing the component of Photoemission Effect, are decided by solving a nonlinear equation system; then a FBP ( Filtered Back Projection ) algorithm is used to reconstruct the decomposition images from the sinograms of bp(s, theta) and bp(s, theta). It is noticed that the first step is the most time-consuming, so it is very important to find out a high-speed and effective iteration computation method. In this paper, we propose a Newton iteration method with an effective estimation strategy of initial value for quickly solving the nonlinear equation system. A CT simulation experiment was implemented to validate the effectiveness of the whole procedure.

Citation Download Citation

Shaojie Tang, Xuanqin Mou, and Tao Luo "An iteration algorithm in dual-energy x-ray imaging based on polychromatic physics model", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422R (2 March 2006); https://doi.org/10.1117/12.652135

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