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Abstract #4469

Mechanism of Conductivity Image Contrast in MREIT: Numerical Simulation & Phantom Experiment

Young Tae Kim1, Tong In Oh1, Atul Singh Minhas1, Hyung Joong Kim1, Jin Keun Seo2, Oh In Kwon3, Eung Je Woo1

1Biomedical Engineering, Kyung Hee University, Yongin, Gyeonggi, Korea, Republic of; 2Computational Science & Engineering, Yonsei University, Seoul, Korea, Republic of; 3Mathematics, Konkuk University, Seoul, Korea, Republic of

MREIT utilizes MR phase images affected by externally injected currents to reconstruct conductivity images. Understanding its contrast mechanism could be difficult due to complexities in associated mathematical expressions of bioelectromagnetism. We constructed stable conductivity phantoms not affected by the ion diffusion process placing thin insulating hollow cylinders with holes of different diameters inside a saline tank. When we extracted induced magnetic flux density images from MR phase images, their slopes changed with conductivity contrasts. Analyzing measured and computed magnetic flux density images of the phantoms, we could quantitatively validate the contrast mechanism in MREIT.