Mr. Zhenyu Yang Profile

Zhenyu Yang

at Shanghai Jiao Tong Univ

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Proceedings Article | 17 October 2012 Paper

Radiation dose performance in the triple-source CT based on a Monte Carlo method

Zhenyu Yang, Jun Zhao

Proceedings Volume 8506, 85061W (2012) https://doi.org/10.1117/12.933859

KEYWORDS: X-ray computed tomography, Monte Carlo methods, X-rays, Tissues, Photons, Sensors, Temporal resolution, Data modeling, Chest, Imaging systems

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Multiple-source structure is promising in the development of computed tomography, for it could effectively eliminate motion artifacts in the cardiac scanning and other time-critical implementations with high temporal resolution. However, concerns about the dose performance shade this technique, as few reports on the evaluation of dose performance of multiple-source CT have been proposed for judgment. Our experiments focus on the dose performance of one specific multiple-source CT geometry, the triple-source CT scanner, whose theories and implementations have already been well-established and testified by our previous work. We have modeled the triple-source CT geometry with the help of EGSnrc Monte Carlo radiation transport code system, and simulated the CT examinations of a digital chest phantom with our modified version of the software, using x-ray spectrum according to the data of physical tube. Single-source CT geometry is also estimated and tested for evaluation and comparison. Absorbed dose of each organ is calculated according to its real physics characteristics. Results show that the absorbed radiation dose of organs with the triple-source CT is almost equal to that with the single-source CT system. As the advantage of temporal resolution, the triple-source CT would be a better choice in the x-ray cardiac examination.

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