Ms. Nancy Tseng Profile

Nancy Tseng

at Univ of Michigan

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Proceedings Article | 14 March 2009 Paper

Simulating ultra-wideband imaging for the early detection of tissue injury

Weihong Niu, Kelan Hlavaty, Daria Tanska, Nancy Tseng, Jia Li, Barbara Penprase

Proceedings Volume 7258, 725813 (2009) https://doi.org/10.1117/12.813898

KEYWORDS: Tissues, Dielectrics, Skin, Antennas, Bone, Injuries, Medical imaging, Ultrasonography, Microwave radiation, Tomography

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Various medical imaging techniques exist to detect the early development of tissue damage. However, a widely commercialized device that can be easily used and is cost effective is still needed. Through a literature review, we examined ultrasound, microwave tomography, and ultra-wideband (UWB) technology. Out of these techniques, UWB is the most promising since it has the capability to detect small adjustments in dielectric properties, which can change with minor alterations in perfusion and internal pressure. These minor alterations are vital in detecting the onset of ischemia, which precedes many serious conditions affecting tissue health. In addition to its ability in detection, UWB also has the potential to become a widely accessible technology to hospitals. Using software called XFdtd, we simulated ultrawideband pulses propagating through planes designed to resemble tissue in its dielectric properties. After testing several sizes of the horn antenna and configurations for the wire and port, the antenna's near field was finally able to reach the distance necessary to penetrate the tissue model. The resulting graph of voltage versus time was generated from the received antenna signal and it will be compared to the graphs that result after the dielectric properties of the model have been changed to simulate tissue injury. Through this manipulation of the tissue model, the sensitivity and selectivity of UWB in measuring small fluctuations in perfusion can be determined. In this future work with XFdtd, we want to show that UWB is a novel and viable technique in detecting early tissue injury.

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